HomeMy WebLinkAboutOrd No. 11-3544ORDINANCE AMENDMENT
ORDINANCE NO. 11 -3544
AN ORDINANCE OF THE CITY OF PLAINVIEW, TEXAS AMENDING
CHAPTER 19, ARTICLE V, FLOOD PREVENTION, OF THE PLAINVIEW
CODE OF ORDINANCES, ESTABLISHING UPDATED
ADMINISTRATIVE PROCEDURES FOR FLOOD HAZARD
PREVENTION IN THE CITY OF PLAINVIEW; DESIGNATING THE
LOCAL FLOODPLAIN ADMINISTRATOR; ADOPTING "THE FLOOD
INSURANCE STUDY FOR HALE COUNTY, TEXAS AND
INCORPORATED AREAS DEVELOPMENT REQUIREMENTS;
REPEALER; CUMULATIVENESS CLAUSE; CONFLICTS CLAUSE;
SEVERABILITY CLAUSE; AND AN EFFECTIVE DATE.
WHEREAS, the Texas Legislature has, in the Flood Control Insurance Act,
Texas Water Code, Section 16.315, delegated the responsibility to local governmental
units to adopt regulations designed to minimize flood losses; and
WHEREAS, the City Council of the City of Plainview passed Ordinance 88 -2769
which sets forth the minimum standards for coverage under the National Flood
Insurance Program; and
WHEREAS, the City Council of the City of Plainview passed Ordinance 89 -2779
to clarify the appeals board which is provided for in Ordinance 88 -2769; and
WHEREAS, the City Council further determined a Master Drainage Plan in
general conformance with the Comprehensive Plan of the City was adopted and
maintained in the Public Works Department; and
Whereas, the City Council of the City of Plainview finds that it is advisable to
review the ordinances that affect the city's flood insurance program; and
WHEREAS, the Federal Emergency Management Agency (FEMA) has issued
the Flood Insurance Study for Hale County, Texas and Incorporated Areas, effective
February 18, 2011"; and
WHEREAS, in order to effectively comply with the current minimum standards for
coverage under the National Flood Insurance Program, the City has reviewed and
recommended adoption of amendments to the current Ordinance at Chapter 19, Article
V, Flood Prevention, in the City of Plainview Code of Ordinances; and
WHEREAS, the Building Trades and Fire Code Board of Appeals has reviewed
staff recommendations on adoption of Chapter 19, Article V, Flood Prevention, in the
City of Plainview Code of Ordinances; and
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WHEREAS, Chapter 19, Article V, Flood Prevention, in the City of Plainview
Code of Ordinances, with proposed amendments as hereinafter made, has been duly
presented to the City Council; and
WHEREAS, the City Council of the City of Plainview finds that it would not be
detrimental or injurious to the public health, safety or general welfare of the citizens of
the City of Plainview.
NOW, THEREFORE, The City of Plainview hereby ordains that:
SECTION I.
Article V, Flood Prevention, of Chapter 19, Plainview Code of Ordinances is
amended as follows:
Sec. 19 -51. Statutory Authorization
The
Legislature of the State of Texas has, in the Flood Control Insurance Act, Texas Water
Code, Section 16.315 delegated the responsibility to local governmental units to adopt
regulations designed to minimize flood losses. Therefore, the City Council of the City of
Plainview, Texas, does ordain as follows {in this articic
This Article shall be known and may be cited as the Flood Prevention Article of
the City of Plainview, Texas and shall apply to all Special Flood Hazard areas within the
City's jurisdiction.
(Ord. No. 88 -2769, 11- 22 -88)
Sec. 19 -52. Findings of Fact
(a) The flood hazard areas of the City of Plainview are subject to periodic
inundation which results in Toss of life and property, health and safety hazards,
disruption of commerce and governmental services, and extraordinary public
expenditures for flood protection and relief, all of which adversely affect the public
health, safety and general welfare.
(b) These flood losses are created by the cumulative effect of obstructions in
floodplains which cause and increase in flood heights and velocities, and by the
occupancy of flood hazard areas by uses vulnerable to flood and hazardous to other
lands because they are inadequately elevated, flood proofed or otherwise protected
from flood damage.
(Ord. No. 88 -2769, 11- 22 -88)
Ord. No. 11 -3544
ARTICLE V
FLOOD PREVENTION
Division I. Statutory Authorization, Findings of Fact, Purpose and Methods
Flood Prevention Page 2 of 22
Sec. 19 -53. Statement of Purpose
fa) It is the purpose of this article Ordinance to promote the public health, safety
and general welfare and to minimize public and private losses due to flood conditions in
specific areas by provisions designed to in Special Flood Hazard Areas. This Article is
designed to regulate restrict uses of and that cause increases in flood heights or
velocities and to prevent the construction of barriers which will divert flood waters and
subject other lands to greater flood hazards. Provisions of this Article are designed to
do the following:
(1) Protect human life and health;
(2) Minimize expenditure of public money for costly flood control projects;
g) Minimize the need for rescue and relief efforts associated with flooding
and generally undertaken at the expense of the general public;
(4) Minimize prolonged business interruptions;
(5) Minimize damage to public facilities and utilities such as water and
gas mains, electric, telephone and sewer lines, streets and bridges
located in floodplains;
(6) Help maintain a stable tax base by providing for the sound use and
development of flood -prone areas in such a manner as to minimize future
flood blight areas; and
(7) Insure that potential buyers are notified that property is in a flood area.
(b) In order to accomplish its purposes, this ordinance uses the following
methods:
(1) Restrict or prohibit uses that are dangerous to health, safety or
property in times of flood, or cause excessive increases in flood heights or
velocities;
2) Require that uses vulnerable to floods, including facilities which serve
such uses, be protected against flood damage at the time of initial
construction;
(3) Control the alteration of natural floodplains, stream channels, and
natural protective barriers, which are involved in the accommodation of
flood waters;
(4) Control filling, grading, dredging and other development which may
increase flood damage;
(5) Prevent or regulate the construction of flood barriers which will
unnaturally divert flood waters or which may increase flood hazards to
other lands.
(Ord. No. 88 -2769, 11- 22 -88)
Scc. 19 54. Methods of rcducing flood losses
Sec. 19 -54. Cumulativeness.
This Article is not intended to repeal, abrogate, or impair any existing easements,
covenants, or deed restrictions. However, where this Article and another ordinance,
easement, covenant, or deed restriction conflict or overlap, whichever impose the more
stringent restrictions shall prevail.
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Division 2. Definitions
Sec. 19-55. Definitions
Unless specifically defined below, words or phrases used in this ordinance shall
be interpreted to give them the meaning they have in common usage and to give this
ordinance its most reasonable application.
Alluvial fan flooding means flooding occurring on the surface of an alluvial fan or
similar landform which originates at the apex and is characterized by high- velocity flows;
active processes of erosion, sediment transport, and deposition; and unpredictable flow
paths.
Apex means a point on an alluvial fan or similar landform below which the flow path of
the major stream that formed the fan becomes unpredictable and alluvial fan flooding
can occur.
Appeal means a request for review of the Floodplain Administrator's interpretation of
any provision of this ordinance or a request for a variance.
Appeals Board means the City of Plainview Building feeleTrades and Fire Code
Board of Appeals.
Appurtenant structure means a structure which is on the same parcel of property as
the principal structure to be insured and the use of which is incidental to the use of the
principal structure.
Area of future conditions flood hazard means the land area that would be inundated
by the 1- percent annual chance (100 year) flood based on future conditions hydrology.
Area of shallow flooding means a designated AO, AH, AR /AO, AR /AH, or VO zone on
a community's Flood Insurance Rate Map (FIRM) with a one percent or greater annual
chance of flooding to an average depth of one to three feet where a clearly defined
channel does not exist, where the path of flooding is unpredictable and where velocity
flow may be evident. Such flooding is characterized by ponding or sheet flow.
Area of special flood hazard is the land in the floodplain within a community subject to
a one percent or greater change chance of flooding in any given year. The area may be
designated as Zone A on the Flood Hazard Boundary Map (FHBM). After detailed
ratemaking has been completed in preparation for publication of the FIRM, Zone A
usually is refined into Zones A, AO, AH, AI -30, AE, A99, AR, A1-30, AR /AE, AR /AO,
AR /AH, AR /A, Al 09, VO, VI -30, VE or V.
Base flood means the flood having a one percent chance of being equaled or
exceeded in any given year.
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Base Flood Elevation (BFE) The elevation shown on the Flood Insurance Rate Map
(FIRM) and found in the accompanying Flood Insurance Study (FIS) for Zones A, AE,
AH, A1-A30, AR, V1 -V30, or VE that indicates the water surface elevation resulting from
the flood that has a one percent chance of equaling or exceeding that level in any given
year also called the Base Flood.
Basement means any area of the building having its floor subgrade (below ground
level) on all sides.
Breakaway wall means a wall that is not part of the structural support of the building
and is intended through its design and construction to collapse under specific lateral
loading forces, without causing damage to the elevated portion of the building or
supporting foundation system.
Critical feature means an integral and readily identifiable part of a flood protection
system, without which the flood protection provided by the entire system would be
compromised.
Development means any man -made change w to improved and unimproved
real estate, including but not limited to buildings or other structures, mining, dredging,
filling, grading, paving, excavation or drilling operations, or storage of equipment or
materials.
Elevated building means, for insurance purposes, a nonbasement building which has
its lowest elevated floor, raised above ground level by foundation walls, shear walls,
posts, piers, pilings, or columns. (i) built, in the case of a building in Zones Al 30, AE,
A, A99, AO, AH, B, C, X, and D, to have the tee of the elevated floor, or in the case of a
or V, to have the- bettem of the lowest horizontal structure
member- of thc cicvatcd floor elevated ebeve-
columns (posts and picrs), or sh ar walls parallel to the floor of thc water and (ii)
flood -ef up-to the- magnitude of the base flood. In the case of
.'so includes a building elevated by m anc of fill
-the case Zones V1 30, YE, or V, "elevated building" also
definition of
the Tower afe-a-- i- s-e-mIe e4 by mgans of br kaway walls if the breakaway walls meet
the- standards of Section 60.3(c)(5) of -the- National
regulations.
Existing Construction means for the purposes of determining rates, structures for
which the "start of construction" commenced before the effective date of the FIRM or
before January 1, 1975, for FIRMs effective before that date. "Existing construction"
may also be referred to as "existing structures."
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Existing manufactured home park or subdivision means a manufactured home park or
subdivision for which the construction of facilities for servicing the lots on which the
manufactured homes are to be affixed (including, at a minimum, the installation of
utilities, the construction of streets, and either final site grading or the pouring of
concrete pads) is completed before the effective date of the floodplain management
regulations adopted by a community.
Existing Structures means, for the purpose of determining rates, structures for which
the "start of construction" commenced before the effective date of the FIRM being
February 18, 2011.
Expansion to an existing manufactured home park or subdivision means the
preparation of additional sites by the construction of facilities for servicing the lots on
which the manufactured homes are to be affixed (including the installation of utilities, the
construction of streets, and either final site grading or the pouring of concrete pads).
FEMA Federal Emergency Management Agency means the parent organization for
the Federal Insurance Administration.
Fill or Filling means the increase of elevation in any area by the addition of material to
the surface of such area.
Flood or flooding means a general and temporary condition of partial or complete
inundation of normally dry land areas from:
(a) the overflow of inland or tidal waters.
(b) the unusual and rapid accumulation or runoff of surface waters from any
source.
Flood Elevation Study means an examination, evaluation and determination of flood
hazards and, if appropriate, corresponding water surface elevations, or an examination,
evaluation and determination of mudslide (i.e., mudflow) and /or flood related erosion
hazards.
Flood Insurance Rate Map (FIRM) means an official map of a community on which the
Federal Emergency Management Agency has delineated both the areas of special flood
hazards and the risk premium zones applicable to the community.
Flood Insurance Study (FIS) see Flood Elevation Study is thc official report provided
by thc Federal Emergency Management Agency. The rcport contains flood profiles,
Boundary Floodway
C CC
Map.
Floodplain or Flood -prone area means any land area susceptible to being inundated
by water from any source (see definition of flooding).
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Floodplain management means the operation of an overall program of corrective and
preventive measures for reducing flood damage, including but not limited to emergency
preparedness plans, flood control works, and floodplain management regulations.
Flood management regulations means zoning ordinances, subdivision regulations,
building codes, health regulations, special purpose ordinances, (such as floodplain
ordinance, grading ordinance and erosion control ordinance) and other applications of
police power. The term describes such state or local regulations, in any combination
thereof, which provide standards for the purpose of flood damage prevention and
reduction.
Flood proofing means any combination of structural and non structural additions,
changes, or adjustments to structures which reduce or eliminate flood damage to real
estate or improved real property, water and sanitary facilities, structures and their
contents.
Flood protection system means those physical structural works for which funds have
been authorized, appropriated, and expended and which have been constructed
specifically to modify flooding in order to reduce the extent of the areas within a
community subject to a "special flood hazard" and the extent of the depths of associated
flooding. Such a system typically includes hurricane tidal barriers, dams, reservoirs,
levees or dikes. These specialized flood modifying works are those constructed in
conformance with sound engineering standards.
without cumulatively incr acing the water surface elevation more than a designated
he,. see Regulatory Floodway
Floodway Fringe means the portion of the regulatory floodplain lying outside the
floodway.
Functionally dependent use means a use which cannot perform its intended purpose
unless it is located or carried out in close proximity to water. The term includes only
docking facilities, port facilities that are necessary for the loading and unloading of cargo
or passengers, and ship building and ship repair facilities, but does not include long-
term storage or related manufacturing facilities.
eee -e
for storage purposes only is not a "habitable floor."
Highest adiacent grade means the highest natural elevation of the ground surface prior
to construction next to the proposed walls of a structure.
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Historic structure means any structure that is:
(1) Listed individually in the National Register of Historic Places (a listing maintained by
the Department of Interior) or preliminarily determined by the Secretary of the
Interior as meeting the requirements for individual listing on the National Register:
(2) Certified or preliminarily determined by the Secretary of the Interior as contributing to
the historical significance of a registered historic district or a district preliminarily
determined by the Secretary to qualify as a registered historic district;
(3) Individually listed on a state inventory of historic places in states with historic
preservation programs which have been approved by the Secretary of the Interior; or
(4) Individually listed on a local inventory of historic places in communities with historic
preservation programs that have been certified either:
a. By an approved state program as determined by the Secretary of the
Interior; or
b. Directly by the Secretary of the Interior in states without approved programs.
Levee means a man -made structure, usually an earthen embankment, designed and
constructed in accordance with sound engineering practices to contain, control or divert
the flow of water so as to provide protection from temporary flooding.
Levee system means a flood protection system which consists of a levee, or levees,
and associated structures, such as closure and drainage devices, which are constructed
and operated in accordance with sound engineering practices.
Lowest floor means the lowest floor of the lowest enclosed area (including basement).
An unfinished or flood resistant enclosure, useable solely for parking or vehicles,
building access or storage in an area other than a basement area is not considered a
building's lowest floor provided that such enclosure is not built so as to render the
structure in violation of the applicable non elevation design requirement of Section 60.3
of the National Flood Insurance Program regulations.
Manufactured home means a structure transportable in one or more sections, which is
built on a permanent chassis and is designed for use with or without a permanent
foundation when connected to the required utilities. For floodplain management
purposes the term "manufactured home" also includes park trailers, travel trailers, and
other similar vehicles placed on a site for greater than 180 consecutive days. For
insurance purposes the term "manufactured home" docs not include park trailers, travel
trailers, and other similar vehicles. The term "manufactured home" does not include a
"recreational vehicle
Manufacted home park or subdivision means a parcel (or contiguous parcel) of and
divided into two (2) or more manufactured home lots for rent or sale.
Master drainage plan means the plan adopted and approved by the City Council that
established an estimated peak water surface elevation for playa lakes and rates of
overflow between lakes for certain areas studied within the corporate City limits and it's
extraterritorial jurisdiction.
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Mean sea level means, for purposes of the National Flood Insurance Program, the
National Geodetic Vertical-Datum (NGVD) of 1923 North American Vertical Datum
(NAVD) of 1988 or other datum, to which base flood elevations shown on a community's
Flood Insurance Rate Map are referenced.
New construction means, :etc for the purpose of
determining insurance rates, structures for which the "start of construction" commenced
on or after the effective date of a floodplain management rc
comma y. an initial FIRM or after December 31, 1974, whichever is later, and includes
any subsequent improvements to such structures. For floodplain management
purposes, "new construction" means structures for which the "start of construction"
commenced on or after the effective date of a floodplain management regulation
adopted by a community and includes any subsequent improvements to such
structures.
Ord. No. 11 -3544
New manufactured home park or subdivision means a manufactured home park or
subdivision for which the construction of facilities for servicing the lots on which the
manufactured homes are to be affixed (including at a minimum, the installation of
utilities, the construction of streets, and either final site grading or the pouring of
concrete pads) is completed on or after the effective date of floodplain management
regulations adopted by a community.
Recreational vehicle means a vehicle which is (i) built on a single chassis; (ii) 400
square feet or less when measured at the largest horizontal projections; (iii) designed to
be self propelled or permanently towable by a light duty truck; and (iv) designed
primarily not for use as a permanent dwelling but as temporary living quarters for
recreational, camping, travel, or seasonal use.
Regulatory floodway means the channel of a river or other watercourse and the
adjacent land areas that must be reserved in order to discharge the base flood without
cumulatively increasing the water surface elevation more than a designated height.
Riverine means relating to, formed by, or resembling a river (including tributaries),
stream, brook, etc.
Special flood hazard area see Area of Special Flood Hazard
Start of construction (for other than new construction or substantial improvements
under the Coastal Barrier Resources Act (Pub. L. 97- 348)), includes substantial
improvement and means the date the building permit was issued, provided the actual
start of construction, repair, reconstruction, rehabilitation, additional placement,
or other improvement was within 180 days of the permit date. The actual start means
either the first placement of permanent construction of a structure on a site, such as the
pouring of slab or footings, the installation of piles, the construction of columns, or any
work beyond the stage of excavation; or the placement of a manufactured home on a
foundation. Permanent construction does not include land preparation, such as clearing,
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grading and filling; nor does it include the installation of streets and /or walkways; nor
does it include excavation for basement, footings, piers or foundations or the erection of
temporary forms; nor does it include the installation on the property of accessory
buildings, such as garages or sheds not occupied as dwelling units or not part of the
main structure. For a substantial improvement, the actual start of construction means
the first alteration of any wall, ceiling, floor, or other structural part of a building, whether
or not that alteration affects the external dimensions of the building.
Structure means, for floodplain management purposes, a walled and roofed building,
including a gas or liquid storage tank, that is principally above ground, as well as a
manufactured home.
Substantial damage means damage of any origin sustained by a structure whereby
the cost of restoring the structure to its before damaged condition would equal or
exceed fifty percent (50 of the market value of the structure before the damage
occurred.
Substantial improvement
structure, the cost of which equals or exceeds 50% of thc market value of thc structure
either, (1) before the improvement or repair is started, or (2) if thc structure has been
definition "substantial improvement" is considered to occur when the first alteration of
any wall, ceiling, floor, or other structural part of the building commences, whether or
not that alteration affects the external dimensions of thc structure. The term docs not,
means
any reconstruction, rehabilitation, addition, or other improvement of a structure, the cost
of which equals or exceeds fifty percent (50 of the market value of the structure
before "start of construction" of the improvement. This term includes structures which
have incurred "substantial damage regardless of the actual repair work performed.
The term does not, however, include either:
(a) any project for improvement of a structure to correct existing violations of
state or local health, sanitary or safety code specifications which have been
identified by the local code enforcement official and which are the minimum
necessary to assure safe living conditions; or
(b) any alteration of a "historic structure provided that the alteration will not
preclude the structure's continued designation as a "historic structure
Variance is means a grant of relief to a person by a community from the requirements
of this ordinance when specific enforcement would result in unnecessary hardship.
terms of a floodplain management regulation. A variance, therefore, permits
(For
full requirement see Section 60.6 of the National Flood Insurance Program regulations.)
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Violation means the failure of a structure or other development to be fully compliant
with the community's floodplain management regulations. A structure or other
development without the elevation certificate, other certifications, or other evidence of
compliance required in Section 60.3.(b)(5), (c)(4), (c)(10), (d)(3), (e)(2), (e)(4), or (e)(5)
of 44 CFR, National Flood Insurance Program Regulations, is presumed to be in
violation until such time as that documentation is provided.
Water surface elevation means the height, in relation to the National Geodetic Vertical
Datum (NGVD) of 1929 North American Vertical Datum (NAVD) of 1988 (or other
datum, where specified), of floods of various magnitudes and frequencies in the
floodplains of coastal or riverine areas.
(Ord. No. 88 -2769, 11- 22 -88; Ord. No. 89 -2779, 3- 14 -89)
Division 3. General Provisions
Sec. 19 -56. Lands to Which affable this Ordinance Applies
This article ordinance shall apply to all areas of special flood hazard within the
jurisdiction of the City of Plainview. (Ord. No. 88 -2769, 11- 22 -88)
Sec. 19 -57. Basis for Establishing the Areas of Special Flood Hazard
The areas of special flood hazard identified by the Federal Emergency
Management Agency in a current scientific and engineering report entitled, "The Flood
Insurance Study (FIS) for e -dated- March 16, 1989, Hale
County, Texas and Incorporated Areas," dated February 18, 2011, with accompanying
Flood Insurance Rate Maps and /or Flood Boundary Floodway Maps (FIRM and /or
FBFM) dated February 18, 2011, and any revisions thereto are hereby adopted by
reference and declared to be incorporated as a part of this Article. The Chief Building
Official shall obtain, review, and utilize other Base Flood Elevations and floodway data
which might become available from Federal, State, local, or private sources as criteria
for requiring that new construction, substantial improvements, or other development
within the City's jurisdiction complies with this Article. The studies shall be maintained
on file in the Office of Public Works and used as a basis for changes in requirements of
this Article recommended by the City Council. (Ord. No. 88 -2769, 11- 22 -88)
Sec. 19 -58. Establishment of Development Permit
A Floodplain Development Permit shall be required to ensure conformance with
the provisions of this ordinance. (Ord. No. 88 -2769, 11- 22 -88)
Sec. 19-59. Compliance
No structure or land shall hereafter be located, altered, or have its use changed
without full compliance with the terms of this article ordinance and other applicable
regulations. (Ord. No. 88 -2769, 11- 22 -88)
Sec. 19 60. Abrogation and Gr atcr Restrictions
This ordinance is not intended to rcp al, abrogate, or impair any existing
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conflict or overlap, whichever imposes the more stringent restrictions shall prevail. (Ord.
No. 88 2769, 11 22 88)
Sec. 19 -640. Interpretation
In the interpretation and application of this ordinance, all provisions shall be; (1)
considered as minimum requirements; (2) liberally construed in favor of the governing
body; and (3) deemed neither to limit nor repeal any other powers granted under State
statutes. (Ord. No. 88 -2769, 11- 22 -88)
Sec. 19 -621. Warning and Disclaimer of Liability
The degree of flood protection required by this article ordinance is considered
reasonable for regulatory purposes and is based on scientific and engineering
considerations. On rare occasions greater floods can and will occur and flood heights
may be increased by man -made or natural causes. This ordinance does not imply that
land outside the areas of special flood hazards or uses permitted within such areas will
be free from flooding or flood damages. This article ordinance shall not create liability on
the part of the community or any official or employee thereof for any flood damages that
result from reliance on this article ordinance or any administrative decision lawfully
made hereunder. (Ord. No. 88 -2769, 11- 22 -88)
Division 4. Administration
Sec. 19 -632. Designation of the FloodPlain Administrator
(a) The Director of Municipal Services Chief Building Official is hereby appointed
the Floodplain Administrator to administer and implement the provisions of this
ordinance and other appropriate sections of 44 CFR (Emergency Management and
Assistance National Flood Insurance Program Regulations) pertaining to floodplain
management.
(b) Duties and responsibilities of the Floodplain Administrator shall include, but
not be limited to, the following:
(1) Maintain and hold open for public inspection all records pertaining to
the provisions of this ordinance.
(2) Review, approve or deny all applications for development permits,
required by Sec. 19 -58 of this Article, and determine whether proposed
building sites, including the placement of manufactured homes, will be
reasonably safe from flooding.
(3) Review permits for proposed development to assure that all necessary
permits have been obtained from those Federal, State or local
governmental agencies (including Section 404 of the Federal Water
Pollution Control Act Amendments of 1972, 33 U.S.C. 1334) from which
prior approval is required.
(4) Where interpretation is needed as to the exact location of the
boundaries of the areas of special flood hazards (for example, where there
appears to be a conflict between a mapped boundary and actual field
conditions) the Floodplain Administrator shall make the necessary
interpretation.
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(5) Notify, in riverine situations, adjacent communities and the State
Coordinating Agency which is the
Water Commicion Texas Water Development Board (TWDB) and also
the Texas Commission on Environmental Quality (TCEQ), prior to any
alteration or relocation of a watercourse, and submit evidence of such
notification to the Federal Emergency Management Agency.
(6) Assure that the flood carrying capacity within the altered or relocated
portion of any watercourse is maintained.
When base flood elevation data has not been provided in accordance
with Section 19 -57, the Floodplain Administrator shall obtain, review and
reasonably utilize any base flood elevation data and floodway data
available from a Federal, State or other source, in order to administer the
provisions of Division Article 5.
(8) When a regulatory floodway has not been designated, the Floodplain
Administrator must require that no new construction, substantial
improvements, or other development (including fill) shall be permitted
within Zones A1-30 and AE on the community's FIRM, unless it is
demonstrated that the cumulative effect of the proposed development,
when combined with all other existing and anticipated development, will
not increase the water surface elevation of the base flood more than one
foot at any point within the community.
(9) Under the provisions of 44 CFR Chapter 1, Section 65.12, of the
National Flood Insurance Program regulations, a community may approve
certain development in Zones A1-30, AE, AH, on the community's FIRM
which increases the water surface elevation of the base flood by more
than one (1) foot, provided that the community first completes all of the
provisions required by Section 65.12.
(Ord. No. 88 -2769, 11- 22 -88)
Sec. 19 -653. Permit Development Procedures
(a) Application for a Floodplain Development Permit shall be presented to the
Floodplain Administrator on forms furnished by him /her and may include, but not be
limited to, plans in duplicate drawn to scale showing the location, dimensions, and
elevation of proposed landscape alterations, existing and proposed structures, including
the placement of manufactured homes, and the location of the foregoing in relation to
areas of special flood hazard. Additionally, the following information is required:
(1) Elevation (in relation to mean sea level), of the lowest floor (including
basement) of all new and substantially improved structures;
(2) Elevation (in relation to mean sea level) to which any nonresidential
structure shall be floodproofed;
(3) A certificate from a registered professional engineer or architect that
the nonresidential floodproofed structure shall meet the floodproofing
criteria of Section 19 -68(b) Section 5 5(2).
(4) Description of the extent to which any watercourse or natural drainage
will be altered or relocated as a result of proposed development.
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(5) Maintain a record of all such information in accordance with Section
19 -64(a) Section /1,B(1).
(b) Approval or denial of a Floodplain Development Permit by the Floodplain
Administrator shall be based on all of the provisions of this ordinance and the following
relevant factors:
(1) The danger to life and property due to flooding or erosion damage;
(2) The susceptibility of the proposed facility and its contents to flood
damage and the effect of such damage on the individual owner;
(3) The danger that materials may be swept onto other lands to the injury
of others;
(4) The compatibility of the proposed use with existing and anticipated
development;
(5) The safety of access to the property in times of flood for ordinary and
emergency vehicles;
(6) The costs of providing governmental services during and after flood
conditions, including maintenance and repair of streets and bridges, and
public utilities and facilities such as sewer, gas, electrical and water
systems;
(7) The expected heights, velocity, duration, rate of rise and sediment
transport of the flood waters and the effects of wave action, if applicable,
expected at the site;
(8) The necessity to the facility of a waterfront location, where applicable;
(9)The availability of alternative locations, not subject to flooding, or
erosion damage, for the proposed use;
(10) The relationship of the proposed use to the comprehensive plan for
that area.
(Ord. No. 88 -2769, 11- 22 -88)
.e••
Sec. 19 -664. Variance Procedures
(a) The Appeals Board, as established by the community composed of community
members, shall hear and render judgment on requests for variances from the
requirements of this ordinance.
(b) The Appeals Board shall hear and render judgment on an appeal only when it is
alleged there is an error in any requirement, decision, or determination made by the
Floodplain Administrator in the enforcement or administration of this ordinance.
(c) Any person or persons aggrieved by the decision of the Appeals Board may
appeal such decision in to the courts of competent jurisdiction.
(d) The Floodplain Administrator shall maintain a record of all actions involving an
appeal and shall report variances to the Federal Emergency Management Agency upon
request.
(e) Variances may be issued for the reconstruction, rehabilitation or restoration of
structures listed on the National Register of Historic Places or the State Inventory of
Historic Places, without regard to the procedures set forth in the remainder of this
ordinance.
Ord. No. 11 -3544
Flood Prevention Page 14 of 22
(f) Variances may be issued for new construction and substantial improvements to
be erected on a lot of one -half /2) acre or less in size contiguous to and surrounded by
lots with existing structures constructed below the base flood level, providing the
relevant factors in Section 19 -65(b) have been fully considered. As the lot size
increases beyond the one -half /2) acre, the technical justification prerequired for
issuing the variance increases.
(g) Upon consideration of the factors noted above and the intent of this ordinance
article, the Appeals Board may attach such conditions to the granting of variances as it
deems necessary to further the purpose and objectives of this ordinance article.
(h) Variances shall not be issued within any designated fioodway if any increase in
flood levels during the base flood discharge would result.
(i) Variances may be issued for the repair or rehabilitation of historic structures
upon a determination that the proposed repair or rehabilitation will not preclude the
structure's continued designation as a historic structure and the variance is the
minimum necessary to preserve the historic character and design of the structure.
(4)Prerequisites for granting variances:
(1) Variances shall only be issued upon a determination that the variance is
the minimum necessary, considering the flood hazard, to afford relief.
(2) Variances shall only be issued upon: (i) showing a good and sufficient
cause; (ii) a determination that failure to grant the variance would result in
exceptional hardship to the applicant, and (iii) a determination that the
granting of a variance will not result in increased flood heights, additional
threats to public safety, extraordinary public expense, create nuisances,
cause fraud on or victimization of the public, or conflict with existing local
laws or ordinances.
(3) Any application to whom a variance is granted shall be given written
notice that the structure will be permitted to be built with the lowest floor
elevation below the base flood elevation, and that the cost of flood insurance
will be commensurate with the increased risk resulting from the reduced
lowest floor elevation.
(k)(t) Variances may be issued by a community for new construction and substantial
improvements and for other development necessary for the conduct of a functionally
dependent use provided (i) the criteria outlined in Section 19 -66(a) through 19 -66(i) are
met, and (ii) the structure or other development is protected by methods that minimize
flood damages during the base flood and create no additional threats to public safety.
(Ord. No. 88 -2769, 11- 22 -88)
Division 5. Provisions for Flood Hazard Reduction
Sec. 19 -675. General Standards
In all areas of special flood hazards the following provisions are required for all
new construction and substantial improvements;
(a) All new construction or substantial improvements shall be designed (or
modified) and adequately anchored to prevent flotation, collapse or lateral movement of
the structure resulting from hydrodynamic and hydrostatic Toads, including the effects of
buoyancy;
Ord. No. 11 -3544
Flood Prevention Page 15 of 22
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(b) All new construction or substantial improvements shall be constructed by
methods and practices that minimize flood damage;
(c) All new construction or substantial improvements shall be constructed with
material resistant to flood damage;
(d) All new construction or substantial improvements shall be constructed with
electrical, heating, ventilation, plumbing, and air conditioning equipment and other
service facilities that are designed and /or located so as to prevent water from entering
or accumulating within the components during conditions of flooding;
(e) All new and replacement water supply systems shall be designed to minimize
or eliminate infiltration of floodwaters into the system;
(f) New and replacement sanitary sewage systems shall be designed to minimize
or eliminate infiltration of floodwaters into the system and discharge from the systems
into floodwaters;
(g) On -site waste disposal systems shall be located to avoid impairment to them or
contamination from them during flooding; and
(h) All new construction or substantial improvement shall be constructed with
electrical, heating, ventilation, plumbing, and air conditioning equipment and other
service facilities that are designed and /or located so as to prevent water from entering
or accumulating within the components during conditions of flooding.
(Ord. No. 88 -2769, 11- 22 -88)
.Sec. 19 -66. Standards for Subdivision Proposals
(a) All subdivision proposals, including the placement of manufactured home
parks and subdivisions, shall be consistent with Sections 19 -52, 19 -53, and 19 -54 of
this Article article as well as meet development permit requirements.
(b) Base flood elevation data shall be generated for subdivision proposals and
other proposed development, including the placement of manufactured home parks and
subdivisions, which is greater than fifty (50) lots or five (5) acres, whichever is lesser, if
not otherwise provided pursuant to Section 19 -57 or Section 19- 62(b)(8) of this
ordinance.
(c) All subdivision proposals, including the placement of manufactured home parks
and subdivisions, shall have adequate drainage provided to reduce exposure of flood
hazards.
(d) All subdivision proposals, including the placement of manufactured home
parks and subdivisions, shall have public utilities and facilities such as sewer, gas,
electrical, and water systems located and constructed to minimize or eliminate flood
damage.
Sec. 19 -687 Specific Standards
In all areas of special flood hazards where base flood elevation data has been
provided as set forth in (i) Section 19 -57, (ii) Section 19 -64(h) or (iii) Section 19- 69(d),
the following provisions are required:
(a) Residential Construction new construction and substantial improvement of
any residential structure shall have the lowest floor (including basement), elevated to or
above the base flood elevation. A registered professional engineer, architect, or land
Ord. No. 11 -3544
Flood Prevention Page 16 of 22
surveyor shall submit a certification to the Floodplain Administrator that the standard of
this subsection as proposed in Section 19- 65(a)(1) is satisfied.
(b) Nonresidential Construction new construction and substantial improvements
of any commercial, industrial or other nonresidential structure shall either have the
lowest floor (including basement) elevated to or above the base flood level or, together
with attendant utility and sanitary facilities, be designed so that below the base flood
level the structure is watertight with walls substantially impermeable to the passage of
water and with structural components having the capability of resisting hydrostatic and
hydrodynamic Toads and effects of buoyancy. A registered professional engineer or
architect shall develop and /or review structural design, specifications, and plans for the
construction, and shall certify that the design and methods of construction are in
accordance with accepted standards of practice as outlined in this subsection. A record
of such certification which includes the specific elevation (in relation to mean sea level)
to which such structures are flood- proofed shall be maintained by the Floodplain
Administrator.
(c) Enclosures new construction and substantial improvements, with fully
enclosed areas below the lowest floor that are usable solely for parking of vehicles,
building access or storage in an area other than a basement and which are subject to
flooding shall be designed to automatically equalize hydrostatic flood forces on exterior
walls by allowing for the entry and exit of floodwaters. Designs for meeting this
requirement must either be certified by a registered professional engineer or architect or
meet or exceed the following minimum criteria:
(1) A minimum of two openings on separate walls having a total net area of not
less than one (1) square inch for every square foot of enclosed area subject to
flooding shall be provided.
(2) The bottom of all openings shall be no higher than one (1) foot above
grade.
(3) Openings may be equipped with screens, louvers, valves, or other
coverings or devices provided that they permit the automatic entry and exit of
floodwaters.
(d) Manufactured Homes
(1) Require that all manufactured homes to be placed within Zone A on a
community's FHBM or FIRM shall be installed using methods and practices
which minimize flood damage. For the purpose of this requirement,
manufactured homes must be elevated and anchored to resist flotation,
collapse, or lateral movement. Methods of anchoring may include, but are not
limited to, use of the over the -top or frame ties to ground anchors. This
requirement is in addition to applicable State and local anchoring requirements
for resisting wind forces.
{2) All manufactured homes shall be in compliance with Scction 19 68(a)
(2) (3-). Require that all manufactured homes to--be that are placed or
substantially improved within Zones A1-30, AH and AE on the community's
FIRM on the following sites:
(i) outside of a manufactured home park or subdivision;
(ii) in a new manufactured home park or subdivision:
Ord. No. 11 -3544
Flood Prevention Page 17 of 22
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(iii) in an expansion to an existing manufactured home park or
subdivision; or
(iv) in an existing manufactured home park or subdivision on which a
manufactured home has incurred "substantial damage" as a result
of a flood,
be elevated on a permanent foundation such that the lowest floor of the
manufactured home is elevated to at or above the base flood elevation and be
securely anchored to an adequately anchored foundation system in accordance
with the provision of Section 19 68(d) to resist flotation, collapse, and lateral
movement
(3) Require that manufactured homes be placed or substantially improved on
sites in an existing manufactured home park or subdivision within Zones A1-
30, AH, and AE on the community's FIRM that are not subject to the provisions
of paragraph (d) of this section be elevated so that either: (i) the lowest floor of
the manufactured home is at or above the base flood elevation, or (ii) the
manufactured home chassis is supported by reinforced piers or other
foundation elements of at least equivalent strength that are no less than 36
inches in height above grade and be securely anchored to an adequately
anchored foundation system to resist flotation, collapse, and lateral movement.
(e) Recreational vehicles require that recreational vehicles placed on sites within
Zones A1-30, AH, and AE on the community's FIRM either (i) be on the site for fewer
than 180 consecutive days, or (ii) be fully licensed and ready for highway use, or (iii)
meet the permit requirements of Section 19 -65(a) and the elevation and anchoring
requirements for "manufactured homes" in paragraph (d) of this section. A recreational
vehicle is ready for highway use if it is on its wheels or jacking system, is attached to the
site only by quick disconnect type utilities and security devices, and has no permanently
attached additions.
(Ord. No. 88 -2769, 11- 22 -88)
.Scc. 19 69. Standards for Subdivision Proposals
{a) All subdivision proposals, including thc placement of manufactured home
this Article article as well as meet development permit requirements.
(b) Basc flood elevation data shall be generated for subdivision proposals and
other proposed development, including thc placcmcnt of manufactured home parks and
subdivisions, which is gr atcr than fifty (50) lots or five (5) acres, whichcvcr is lesser, if
not otherwise provided pursuant to Section 19 57 or Section 19 64(h) of this ordinance.
(c) All subdivision proposals including the placement of manufactured home parks
hazards.
(d) All subdivision proposals including thc placcmcnt of manufactured home parks
and water syctems located and constructed to minimize or eliminate flood damage.
(Ord. No. 88 -2769, 11- 22 -88)
Ord. No. 11 -3544 Flood Prevention
Page 18 of 22
Sec. 19 7068. Standards for Areas of Shallow Flooding (AO /AH ZONES)
Located within areas of special flood hazard established in Section 19 -57, are
areas designated as shallow flooding. These areas have special flood hazards
associated with base flood depths of 1 to 3 feet where a clearly defined channel does
not exist where the path of flooding is unpredictable, and where velocity flow may
be evident. Such flooding is characterized by ponding or sheet flow; therefore, the
following provisions apply:
(a) All new construction and substantial improvements of residential structures
have the lowest floor (including basement) elevated to or above the base flood elevation
or the highest adjacent grade at least as high as the depth number specified in feet on
the community's FIRM (at least two (2) feet if no depth number is specified).
(b) All new construction and substantial improvements of nonresidential
structures must:
(1) have the lowest floor (including basement) elevated to or above the base
flood elevation or above the highest adjacent grade at least as high as the
depth number specified in feet on the community's FIRM (at least two (2) feet
if no depth number is specified); or
(2) together with attendant utility and sanitary facilities be designed so 50 that
below the base specified flood depth level in an AO Zone, or below the Base
Flood Elevation in an AH Zone, the structure is watertight with walls
substantially impermeable to the passage of water and with structural
components having the capability of resisting hydrostatic and hydrodynamic
loads of effects of buoyancy.
(c) A registered professional engineer or architect shall submit a certification to the
Floodplain Administrator that the standards of this Section, as proposed in Section
Article 19 -63 (a)(3), are satisfied.
(d) Require within Zones AH or AO adequate drainage paths around structures on
slopes, to guide flood waters around and away from proposed structures.
(Ord. No. 88 -2769, 11- 22 -88)
Sec. 194469 Floodways
Floodways Located within areas of special flood hazard established in Section
19 -57 are areas designated as floodways. Since the floodway is an extremely
hazardous area due to the velocity of floodwaters which carry debris, potential
projectiles, and erosion potential, the following provisions shall apply;
(a) Encroachments are prohibited, including fill, new construction, substantial
improvements and other development within the adopted regulatory floodway unless
eertificatie41 by a professional registered engineer or architect is provided by
demonstrating that encroachments it has been demonstrated through hydrologic and
hydraulic analyses performed in accordance with standard engineering practice that the
proposed encroachment would ebalf not result in any increase in flood levels within the
community during the occurrence of the base flood discharge.
(b) If Subsectionl9- 69(a), above, is satisfied, all new construction and substantial
improvements shall comply with all applicable flood hazard reduction provisions of
Sections 19 -65 to 19 -69.
Ord. No. 11 -3544
Flood Prevention Page 19 of 22
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(c) Under the provisions of 44 CFR Chapter 1, Section 65.12 of the National
Flood Insurance Program Regulations, a community may permit encroachments within
the adopted regulatory floodway that would result in an increase in base flood
elevations, provided that the community first completes all of the provisions required by
Section 65.12.
(Ord. No. 88 -2769, 11- 22 -88)
Sec. 19 -70. Increased Flood Heights, Liability.
The degree of flood protection required by this Article is considered reasonable
for regulatory purposes and is based on scientific and engineering considerations. On
rare occasions, greater floods can and will occur and flood heights may be increased by
man -made or natural causes. This Article does not imply that land outside the areas of
special flood hazards or uses permitted within such areas will be free from flooding or
flood damages. This Article shall not create liability on the part of the City, any official,
or Employee thereof for any flood damages that result from reliance on this Article or
any administrative decision lawfully made thereunder.
Sec. 19 -71. Building Permits.
Except as provided in the following section, the building official is prohibited from
issuing building permits for structures within any playa lake area.
Sec. 19 -72. Development and Platting.
(a) The Chief Building Official is authorized to issue permits to owners to make
uniform fills in playa lake areas below the estimated high -water line; provided, that
such fills are made by dirt excavated from below the estimated high -water line, and the
fills produce a ground surface above the estimated high -water lever, for all and in such
areas intended to be improved for human habitation if the plans have been approved
by Planning and Zoning Commission, and the water holding capacity of the lake area is
not thereby decreased. The perimeter shown on such plats of any such lake area shall
be modified to conform to such fills, and building permits may be issued when the
ground surface has in fact been raised to an elevation above the estimated high -water
level.
(b) When the Planning and Zoning Commission approves any plat or replat of any
tract of land in a playa lake area affected by an estimated high -water line, and such plat
is supported by plans and specifications for making uniform fills below the estimated
high -water level by using dirt excavated from below the estimated high -water level and
the fills will produce a ground surface above the estimated high -water level for all land
intended to be improved for human habitation and the water holding capacity of the lake
area will not be thereby decreased;. The perimeter of such lake area plat shall be
modified to conform thereto, and building permits may be issued when the ground
surface has in fact been raised to an elevation above the estimated high -water level.
Sec. 19 -723. Penalty Penalties for non compliance
guilty of a micdcmcaanor, and upon conviction, shall be fined a sum of not Icss than Ono
a
919 11
Ord. No. 11 -3544
Flood Prevention
Page 20 of 22
Each and every days' violation shall constitute a separate and distinct offense. In case
thc owner or occupant of any lot, Tots or premises under thc provisions of this ordinance
shall be a corporation, and shall violate any provisions of this ordinance, the President,
Vice President, Secretary, or Tr asurer of such corporation or any manager, agent or
employee of such corporation shall be also severely liable for thc penalties herein
N structure or land shall hereafter be constructed, located, extended, converted,
or altered without full compliance with the terms of this Article and other applicable
regulations. Violation of the provisions of this Article by failure to comply with any of its
requirements (including violations of conditions and safeguards established in
connection with conditions) shall constitute a misdemeanor punishable in accordance
with Sec. '1-5 of this Code. Each day on which a violation shall occur or continue shall
be deemed a separate and distinct offense. Nothing herein contained shall prevent the
City of Plainview, Texas from taking such other lawful action as is necessary to prevent
or remedy any violation of this Article.
Sec. 19 -734. Copies of flood hazard map
When available, there shall be furnished to persons requesting same, a copy of
the city flood hazard boundary map.
To cover the city's cost, there shall be charged for each said map a sum of five
and no /100 dollars ($5.00) payable to the city.
(Ord. No. 77 -2034, 1- 25 -77)
Sec. 19 -75. Severability
Severability is intended throughout and within this Article. If any provision,
including any section, paragraph, sentence, clause, phrase or word or the application
thereof to any person or circumstance is held invalid, unconstitutional, or unenforceable
by a court of law or administrative agency with jurisdiction over the matter, such action
shall not be construed to affect any other valid portion of this Ordinance. A
constitutional construction hereof is intended and shall be given. There is not intent
herein to violate either of the Texas Constitution or the Constitution of the United States.
Secs. 19-74 76 to 19 -80. Reserved.
SECTION II
Provisions of this ordinance are cumulative and nothing herein shall prevent, alter,
or diminish the applicability or enforcement of other ordinances restricting, regulating, or
governing the subject matter herein.
SECTION III
All ordinances or parts of ordinances inconsistent with any provisions of this
ordinance are hereby repealed to the extent of such conflict, and the provisions of this
ordinance shall be and remain controlling as to the matters regulated, herein.
Ord. No. 11 -3544
Flood Prevention Page 21 of 22
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SECTION IV
All ordinances or portions of any ordinance of the City of Plainview, Texas in
conflict herewith, are hereby amended to conform with the provisions hereof.
SECTION V
This ordinance shall be of full force and effect upon its passage and publication
as required by law.
PASSED AND APPROVED on first reading this 8 day of February, 2011.
PASSED AND APPROVED on second reading this 17;x] day of February 2011.
APPROVED AS TO FORM:
Ord. No. 11 -3544
Belinda Hinojosa, City Se
APPROVED AS TO CONTENT:
_Q
Delwin Derrick, Chief Building Official
Leslie Spear Pea ce, City Attorney
o n C. Anders() Mayor
Flood Prevention Page 22 of 22
FLOOD
INSURANCE
STUDY
HALE COUNTY,
TEXAS
AND INCORPORATED AREA
Community
Name
ABERNATHY, CITY OF*
EDMONSON, CITY OF
HALE CENTER, CITY OF
HALE COUNTY
(UNINCORPORATED AREAS)
PETERSBURG, CITY OF
PLAINVIEW, CITY OF
*FOR INFORMATION PURPOSES ONLY
*NO SPECIAL FLOOD HAZARD AREAS
Community
Number
480271
480272
480273
481223
480274
480275
tT'�7�nr
/)I
EFFECTIVE DATE: February 18, 2011
Hale County
Federal Emergency Management Agency
FLOOD INSURANCE STUDY NUMBER
48189CV000A
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58
NOTICE TO
FLOOD INSURANCE STUDY USERS
Communities participating in the National Flood Insurance Program have established repositories of flood
hazard data for floodplain management and flood insurance purposes. This Flood Insurance Study may not
contain all data available within the repository. It is advisable to contact the community repository for any
additional data.
Selected Flood Insurance Rate Map panels for the community contain information that was previously shown
separately on the corresponding Flood Boundary and Floodway Map panels (e.g., floodways, cross sections).
Part or all of this Flood Insurance Study may be revised and republished at any time. In addition, part of this
Flood Insurance Study may be revised by the Letter of Map Revision process, which does not involve
republication or redistribution of the Flood Insurance Study. It is, therefore, the responsibility of the user to
consult with community officials and to check the community repository to obtain the most current Flood
Insurance Study components.
Initial Countywide FIS Effective date: February 18, 2011
TABLE OF CONTENTS
Page
1.0 INTRODUCTION 1
1.1 Purpose of Study 1
1.2 Authority and Acknowledgments 1
1.3 Coordination 2
2.0 AREA STUDIED 3
2.1 Scope of Study 3
2.2 Community Description 4
2.3 Principal Flood Problems 4
2.4 Flood Protection Measures 5
3.0 ENGINEERING METHODS 5
3.1 Hydrologic Analyses 5
3.2 Hydraulic Analyses 7
3.3 Vertical Datum 8
4.0 FLOODPLAIN MANAGEMENT APPLICATIONS 9
4.1 Floodplain Boundaries 9
4.2 Floodways 10
5.0 INSURANCE APPLICATION 12
6.0 FLOOD INSURANCE RATE MAP 13
7.0 OTHER STUDIES 15
8.0 LOCATION OF DATA 15
9.0 BIBLIOGRAPHY AND REFERENCES 15
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60
Page
Figure 1 Floodway Schematic 12
Table 1 Flooding Sources Studied by Detailed Methods 3
Table 2 Letters of Map Change 3
Table 3 Summary of Discharges 6
Table 4 Summary of Stillwater Elevations 7
Table 5 Manning's "n" Values 8
Table 6 Floodway Data 11
Table 7 Community Map History 14
Exhibit 1 Flood Profiles
Exhibit 2 Flood Insurance Rate Map Index
Flood Insurance Rate Map
FIGURES
TABLES
EXHIBITS
Running Water Draw Panels 01P -03P
Tributary A Panel 04P
Tributary to Running Water Draw Panel 05P
1.0 INTRODUCTION
1.1 Purpose of Study
FLOOD INSURANCE STUDY
HALE COUNTY, TEXAS AND INCORPORATED AREAS
This Flood Insurance Study (FIS) revises and updates information on the existence and
severity of flood hazards in the geographic area of Hale County; including the Cities of
Abernathy, Edmonson, Hale Center, Petersburg, and Plainview, and the unincorporated areas
of Hale County (referred to collectively herein as Hale County) and aids in the administration
of the National Flood Insurance Act of 1968 and the Flood Disaster Protection Act of 1973.
This study has developed flood -risk data for various areas of the community that will be used
to establish actuarial flood insurance rates and to assist the community in its efforts to
promote sound floodplain management. Minimum floodplain management requirements for
participation in the National Flood Insurance Program (NFIP) are set forth in the Code of
Federal Regulations at 44 CFR 60.3.
Please note that the City of Abernathy is geographically located in Hale, and Lubbock
Counties. The City of Abernathy, within the limits of Hale County, is included in this FIS
report for information purposes only. See the Lubbock County FIS for flood insurance
purposes.
Please note that on the effective date of this study, the Cities of Edmonson, Hale Center, and
Petersburg have no mapped Special Flood Hazard Areas (SFHA). This does not preclude
future determinations of SFHAs that could be necessitated by changed conditions affecting
the community (ie. annexation of new lands) or the availability of new scientific or technical
data about flood hazards.
In some States or communities, floodplain management criteria or regulations may exist that
are more restrictive or comprehensive than the minimum Federal requirements. In such cases,
the more restrictive criteria take precedence, and the State (or other jurisdictional agency) will
be able to explain them.
The Digital Flood Insurance Rate Map (DFIRM) and FIS report for this countywide study
have been produced in digital format. Flood hazard information was converted to meet the
Federal Emergency Management Agency (FEMA) DFIRM database specifications and
Geographic Information System (GIS) format requirements. The flood hazard information
was created and is provided in a digital format so that it can be incorporated into a local GIS
and be accessed more easily by the community.
1.2 Authority and Acknowledgments
The sources of authority for this FIS report are the National Flood Insurance Act of 1968 and
the Flood Disaster Protection Act of 1973.
This FIS was prepared to include all jurisdictions within Hale County in a countywide FIS.
The authority and acknowledgements prior to this countywide FIS were compiled from the
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62
previously identified FIS reports for flood prone jurisdictions within Hale County and are
shown below:
Plainview, City of: The hydrologic and hydraulic analyses for the original study and a
revision in 1990 were performed by the U.S. Army Corps of Engineers (USACE), Fort Worth
District for FEMA under Inter Agency Agreement No. EMW -86 -E -2226, Project Order No.
12, and all Amendments thereto. The work for the original study was completed on
November 5, 1987. The revision in 1990 included an update to the corporate limits of the
city.
For this first countywide study, MAPVI compiled existing data to convert the previous City of
Plainview FIS into digital format. MAPVI completed this work in April 2009, under Contract
No. EMT 2002 -CO -0052.
Base map information used to develop the Flood Insurance Rate Maps (FIRMs) that
correspond to this FIS was derived from multiple sources. This information was compiled
from the US Geological Survey (USGS), 1989; the National Geodetic Survey, 2004; the U.S.
Census Bureau, 2003; and the Texas Natural Resource Information System, 2007.
The projection used in the preparation of the FIRMs was the Texas State Plane Coordinate
Grid System, North Central Zone (FIPS 4202). The horizontal datum is the North American
Datum 1983 (NAD83) and the vertical datum is the North American Vertical Datum 1988
(NAVD88). Differences in datum, projection or State Plane zones used in the production of
the FIRMs for adjacent jurisdictions may result in slight positional differences across
jurisdictional boundaries. These differences do not affect the accuracy of these FIRMs.
1.3 Coordination
An initial Consultation Coordination Officer (CCO) meeting is held with representatives from
FEMA, the community, and the study contractor to explain the nature and purpose of a FIS,
and to identify the streams to be studied by detailed methods. A final CCO meeting is held
with representatives from FEMA, the community, and the study contractor to review the
results of the study.
Plainview, City of: On September 17, 1985, an initial CCO meeting was held with
representatives of FEMA, the city, and the USACE (the study contractor) to establish specific
flooding sources that would be investigated by detailed methods. Also discussed were local
floodplain regulations, available community maps, flood history, and other hydrologic data.
The following agencies, communities, businesses, and persons were contacted for information
or coordination of results: the USGS; the US Coast and Geodetic Survey (USC the
Texas Department of Highways and Public Transportation; the Texas Department of Water
Resources; the Natural Resource Conservation Service (NRCS); Dewberry Davis; and
Greenhorne and O'Mara, Inc.
On April 27, 1988, a final CCO meeting was held with representatives of FEMA, the city,
and the study contractor to review the results of the study. All problems raised in the meeting
have been addressed in that study.
2.0 AREA STUDIED
For this countywide study, an initial CCO meeting was held on May 14, 2008, and was
attended by representatives of the community, the study contractor, and FEMA. A final CCO
meeting was held on August 19, 2009, and was attended by representatives of the community,
the study contractor, and FEMA. All problems raised at that meeting have been addressed in
this study.
2.1 Scope of Study
This FIS report covers the entire geographic area of Hale County, Texas. The areas studied
by detailed and approximate methods were selected with priority given to all known flood
hazards, and areas of projected development or proposed construction though November
1992.
All of the flooding sources listed in Table 1, "Flooding Sources Studied by Detailed
Methods," were previously studied by detailed methods. Those limits of detailed study are
indicated on the Flood Profiles (Exhibitl) and on the FIRMs (Exhibit 2).
Table 1 Flooding Sources Studied by Detailed Methods
Running Water Draw
Playa A
Playa B
Playa C
Playa D
Playa E
Playa F1
Playa F2
Tributary A
Tributary to Running Water Draw
For this countywide study, all flooding sources that had been previously studied by detailed
methods and not subsequently restudied were redelineated. This process consisted of
updating the floodplain boundaries based on the most current topographic data. New
hydrologic and hydraulic analyses were not performed on the redelineated flooding sources.
In the original FIS for the City of Plainview, five unnamed playas were studied by
approximate methods within the corporate limits of the City of Plainview. Approximate
analyses were performed on many streams and playas in the unincorporated areas of Hale
County, but a FIS was not published in support of these analyses.
Approximate analyses were used to study those areas having a low development potential or
minimal flood hazards. Table 2, "Letters of Map Change" indicates LOMCs that have been
incorporated into this countywide study.
Table 2 Letters of Map Change
Case Number Community Old Panel New Panel
01- 06 -383A City of Plainview 4802750005B 48189CO205C
08- 06 -1324A City of Plainview 4807250008B 48189CO215C
3
63
64
2.2 Community Description
Hale County is located in Western Texas in the geographical area known as the South Plains,
on the Llano Estacado. The county has an area of approximately 1,022 square miles. It is
bordered to the south by Lubbock County, to the west by Lamb County, to the north by Castro
and Swisher Counties, and to the east by Floyd County. The population of Hale County is
36,602 with about 61 percent of the population residing in the City of Plainview, the county
seat (Reference 1). There are four other cities in Hale County (Abernathy, Edmonson, Hale
Center, and Petersburg), which account for another 17% of the population.
The topography within Hale County is primarily relatively flat farmland, with fertile sandy
and loamy soils and many playas (Reference 2). Vegetation in the county is comprised
almost entirely of crop lands. Corn, oats, and sunflowers are also grown in the county, in
smaller quantities (Reference 3). The county has an annual average rainfall of 19.34 inches
and temperatures range from a low of 26 degrees Fahrenheit in the winter to a high of 93
degrees Fahrenheit in the summer (Reference 2).
Abernathy, City of: This city had a population of 2,839 at the 2000 census (Reference 1).
Edmonson, City of: This city had a population of 123 at the 2000 census (Reference 1).
Hale Center, City of: This city had a population of 2,263 at the 2000 census (Reference 1).
Petersburg, City of: This city had a population of 1,262 at the 2000 census (Reference 1).
Plainview, City of: The city is located approximately 50 miles north of Lubbock and 90 miles
south of Amarillo. The city was founded in 1887 by Z. T. Maxwell and E.L. Lowe, who had
homesteaded the two quarter sections, on which the town is located. The site, at the point
where the Ranald S. Mackenzie trail struck Running Water Draw, was named Plainview
because of its location of high ground, which afforded a magnificent view of the plains.
Plainview is a commercial center for an extensively irrigated farming area. Industries
manufacture agricultural machinery, irrigation pumps, pipe and sprinkler systems, and
fertilizer, as well as process castor oil, cottonseed oil, food, and dairy products (Reference 4).
The average temperature ranges from a January minimum of 28 degrees Fahrenheit to a July
maximum of 93 degrees Fahrenheit. The annual average precipitation (rain and snowfall) in
Plainview is 19 inches (Reference 5).
One major drainage area is Running Water Draw, which crosses the southwest portion of the
city. Most of the drainage area of Running Water Draw in and above the City of Plainview is
relatively flat and covered with small playa lakes that collect and store most of the runoff from
rainfall that occurs in the basin. Only the drainage area immediately adjacent to the stream
contributes runoff to the draw (Reference 6).
2.3 Principal Flood Problems
There are no known flood problems within the unincorporated areas of Hale County and the
Cities of Abemathy, Edmonson, Hale Center, and Petersburg. Because there was no
previously printed FIS report for the unincorporated areas of Hale County, the principal flood
problems that prompted the development of the effective A Zones are not known. According
4
to the National Climatic Data Center, there were 22 flash flood events reported in Hale
County between January 1, 1950 and November 30, 2008 (Reference 7).
Plainview, City of: Major flooding experienced in Plainview occurred in 1890 with no record
of peak flow, June 1941 (12,000 cfs), June 1960 (9,130 cfs), June 1965 (3,300 cfs), June
1974 (1890 cfs), and May 1951 (1,800 cfs). Running Water Draw' s 1- percent annual- chance
peak discharge was presented as 7,400 cfs in 1968 (Reference 8).
2.4 Flood Protection Measures
Plainview, City of: There are seven NRCS detention structures on Running Water Draw
above Plainview that control all but 32.6 square miles. All of the results for Running Water
Draw submitted in the original study and a revision in 1990 were obtained from an interim
report prepared by the USACE (Reference 8). In September 1973, Plainview entered into the
Emergency Program of the National Flood Insurance Program. Floodplain management is
also regulated through local ordinances.
There are no known flood protection measures in place in the other incorporated areas or the
unincorporated areas of Hale County.
3.0 ENGINEERING METHODS
For the flooding sources studied by detailed methods in the community, standard hydrologic and
hydraulic study methods were used to determine the flood- hazard data required for this study. Flood
events of a magnitude that is expected to be equaled or exceeded once on the average during any 10
50- 100 or 500 -year period (recurrence interval) have been selected as having special significance
for floodplain management and for flood insurance rates. These events, which are commonly termed
the 10 50 100 and 500 -year floods, have a 10 2 1 and 0.2- percent annual- chance, respectively,
of being equaled or exceeded during any year. Although the recurrence interval represents the long-
term, average period between floods of a specific magnitude, rare floods could occur at short intervals
or even within the same year. The risk of experiencing a rare flood increases when periods greater
than 1 year are considered. For example, the risk of having a flood that equals or exceeds the 1-
percent- annual- chance flood in any 50 -year period is approximately 40 percent (4 in 10); for any 90-
year period, the risk increases to approximately 60 percent (6 in 10). The analyses reported herein
reflect flooding potentials based on conditions existing in the community at the time of completion of
this FIS. Maps and flood elevations will be amended periodically to reflect future changes.
3.1 Hydrologic Analyses
Hydrologic analyses establish peak discharge frequency relationships for each flooding source
studied by detailed methods affecting the community. For each community within Hale
County that had a previously printed FIS report, the hydrologic analyses described in those
reports have been compiled and are summarized below.
Plainview, City of: National Weather Service (NWS) Technical Paper No. 40, and National
Oceanic Atmospheric Administration (NOAA) Technical Memorandum NWS Hydro -35 were
used in developing the 1- percent- annual chance storm (References 9 and 10). Flow
frequencies and elevations for the playas studied in detail were developed using the computer
program NUDALLAS (Reference 11). The watershed was divided into sub basins, and
synthetic unit and flood hydrographs were developed at selected locations. Peak discharge-
5
65
66
frequency values were computed for selected locations. Routing of the flood hydrographs
through each sub -basin reach was accomplished using a modified PULS reservoir routing.
The HEC -2 backwater model provided the elevation discharge storage relationships for each
reach of all streams studied by detailed methods (Reference 12). A summary of the drainage
area -peak discharge relationships for the flooding sources studied by detailed methods is
shown in Table 3, "Summary of Discharges." However, discharge information was not
provided for Tributary A, Tributary to Running Water Draw, Playa F1 or Playa F2 in the
previous FIS for the City of Plainview (Reference 6).
The City of Plainview study area is situated in the Geological Survey Hydrologic Unit
Numbers 12050005 and 12050006. The study areas watershed is in the Water Resources
Council Texas -Gulf Region, Sub region 05.
Table 3 Summary of Discharges
Peak Discharge (cfs)
Flooding Source and Location Drainage Area (me) 1- Percent Annual- Chance
Running Water Draw
Downstream of Atchison
Topeka and Santa Fe Railway 471.5 8,200
At Plainview Gauge 432.2 7,400
Approximately 2500 feet
Upstream of Interstate Route 27 422.0 6,400
Playa B
Inflow 4.71 3,490
Outflow 4.71 2,846
Playa C
Outflow 0.14 35
Playa D
Inflow 23.53 5,850
Outflow 23.53 4,090
Playa E
Inflow 22.58 6,170
Outflow 22.58 5,830
The stillwater elevations for the 1- percent- annual chance flood have been determined for
Playas F1 and F2. These results are summarized in Table 4, "Summary of Stillwater
Elevations."
6
3.2 Hydraulic Analyses
Table 4 Summary of Stillwater Elevations
Flooding Source and Location
Playa F1
Playa F2
Elevation (feet NAVD)
1- Percent Annual- Chance
3,382.55
3,387.45
Because there is no previously printed FIS report for the unincorporated areas of Hale County,
the hydrologic analyses used to develop the effective A Zones shown on the FIRMs are not
known.
Analyses of the hydraulic characteristics of flooding from the sources studied were carried out
to provide estimates of the elevations of floods of the selected recurrence intervals. Users
should be aware that flood elevations shown on the FIRM represent rounded whole -foot
elevations and may not exactly reflect the elevations shown on the Flood Profiles or in the
Floodway Data tables in the FIS report. Flood elevations shown on the FIRM are primarily
intended for flood insurance rating purposes. For construction and/or floodplain management
purposes, users are cautioned to use the flood elevation data presented in this FIS in
conjunction with the data shown on the FIRM.
Flood profiles were drawn showing computed water- surface elevations to an accuracy of 0.5
foot for floods of the selected recurrence intervals (Exhibit 1). Locations of selected cross
sections used in the hydraulic analyses are shown on the Flood Profiles (Exhibit 1). For
stream segments for which a floodway is computed (Section 4.2), selected cross section
locations are always shown on the FIRMs (Exhibit 2).
For each community within Hale County that had a previously printed FIS report, the
hydraulic analyses described in those reports have been compiled and summarized below.
Plainview, City of: Analyses of the hydraulic characteristics of flooding from the sources
studied were carried out to provide estimates of the elevations of floods of the selected
recurrence intervals. Cross sections for the backwater analyses were field surveyed and
located at close intervals above and below bridges and culverts in order to compute the
significant backwater effects of these structures. Bridge data was obtained by field
measurements and by bridge plans from the Texas Department of Highways and Public
Transportation (Reference 6). Locations of selected cross sections used in the hydraulic
analyses are shown on the Flood Profiles (Exhibit 1) and the FIRMs (Exhibit 2) where
applicable.
Water- surface elevations of floods of the selected recurrence intervals were computed using
the USACE HEC -2 step- backwater computer program (Reference 12). Flood profiles were
drawn showing computed water- surface elevations for floods of the selected recurrence
intervals. Roughness factors (Manning's "n used in the hydraulic computations were chosen
by engineering judgment and based on field observations of the flooding sources and
floodplain areas. The channel "n" and overbank "n" values for all flooding sources studied in
67
68
detail are shown in Table 5, "Manning's "n" Values." However, roughness factors were not
provided for Tributary A, Tributary to Running Water Draw, Playa F1 or Playa F2 in the
previous FIS for the City of Plainview (Reference 6).
Table 5 Manning's "n" Values
Stream Channel "n" Overbank "n"
Running Water Draw 0.030 0.055 0.045 0.065
Playas A, B, and C 0.045 0.055 0.045 0.055
Playas D, E, Fl, and F2 0.055 0.055
The hydraulic analyses for the study were based on unobstructed flow. The flood elevations
shown on the profiles are thus considered valid only if hydraulic structures remain
unobstructed, operate properly, and do not fail.
Because there was no previously printed FIS report for the unincorporated areas of Hale
County, the hydraulic analyses used to develop the effective A Zones shown on the FIRMs
are not known.
3.3 Vertical Datum
All FIS reports and FIRMs are referenced to a specific vertical datum. The vertical datum
provides a starting point against which flood, ground, and structure elevations can be
referenced and compared. Until recently, the standard vertical datum used for newly created
or revised FIS reports and FIRMs was the National Geodetic Vertical Datum of 1929
(NGVD29). With the completion of the NAVD88, many FIS reports and FIRMs are now
prepared using NAVD as the referenced vertical datum.
Flood elevations shown in this FIS report and on the FIRM are referenced to the NAVD88.
These flood elevations must be compared to structure and ground elevations referenced to the
same vertical datum. It is important to note that adjacent counties may be referenced to
NGVD29. This may result in differences in base flood elevations (BFEs) across the county
boundaries between the counties.
For this countywide study, the Flood Profiles and BFEs were revised to reflect the new datum
values. Prior versions of the FIS report and FIRM for the City of Plainview in Hale County
were referenced to NGVD29 (Reference 6). To accurately convert flood elevations for the
City of Plainview from the prior NGVD29 to the current NAVD88 datum, the following
procedure was implemented. Coordinate points were obtained for the area of interest, located
at a central point in the vicinity of the redelineated streams within the City of Plainview, and
were converted using the National Geodetic Survey (NGS) VERTCON software version 2.10,
which is approved by FEMA (Reference 13). A conversion factor of +1.348 feet was
established for the detailed study.
The BFEs shown on the FIRM represent whole -foot rounded values. For example, a BFE of
102.4 will appear as 102 on the FIRM and 102.6 will appear as 103. Therefore, users that
wish to convert the elevations in this FIS to NGVD29 should apply the stated conversion
factor to elevations shown on the Flood Profiles and supporting data tables in the FIS report,
which are shown, at a minimum, to the nearest 0.1 foot.
For information regarding conversion between the NGVD29 and NAVD88, visit the National
Geodetic Survey website at www.ngs.noaa.gov, or contact the National Geodetic Survey at
the following address:
Vertical Network Branch, N /CG 13
National Geodetic Survey, NOAA
Silver Spring Metro Center 3
1315 East -West Highway
Silver Spring, Maryland 20910
(301) 713 -3191
4.0 FLOODPLAIN MANAGEMENT APPLICATIONS
The NFIP encourages State and local governments to adopt sound floodplain management programs.
To assist in this endeavor, each FIS report provides 1- percent annual- chance floodplain data, which
may include a combination of the following: 10 2 1 and 0.2- percent- annual chance flood
elevations; delineations of the 1- and 0.2- percent annual- chance floodplains; and a 1- percent annual-
chance floodway. This information is presented on the FIRM and in many components of the FIS
report including: Flood Profiles, Floodway Data tables, and Summary of Stillwater Elevation tables.
Users should reference the data presented in the FIS report as well as additional information that may
be available at the local community map repository before making flood elevation and/or floodplain
boundary determinations.
4.1 Floodplain Boundaries
To provide a national standard without regional discrimination, the 1- percent annual- chance
flood has been adopted by FEMA as the base flood for floodplain management purposes. The
0.2- percent annual- chance flood is employed to indicate additional areas of flood risk in the
community. For each stream studied by detailed methods, the 1- and 0.2- percent annual-
chance floodplain boundaries have been delineated using the flood elevations determined at
each cross section. Between cross sections, the boundaries were interpolated using
topographic maps at a scale of 1:24,000, with a contour interval of 10 feet (Reference 14).
In this countywide study, 10 -meter Digital Elevation Model (DEM) topographic data was
provided by the USGS. This data was used to determine the floodplain boundaries of
approximate analyses areas.
The 1- and 0.2- percent annual- chance floodplain boundaries are shown on the FIRMs
(Exhibit 2). On this map, the 1- percent annual chance floodplain boundary corresponds to
the boundary of the areas of special flood hazards (Zones A, AH, and AE), and the 0.2-
percent- annual chance floodplain boundary corresponds to the boundary of areas of moderate
flood hazards. In cases where the 1- and 0.2- percent annual- chance floodplain boundaries are
close together, only the 1- percent annual- chance floodplain boundary has been shown. Small
areas within the floodplain boundaries may lie above the flood elevations, but cannot be
shown due to limitations of the map scale and /or lack of detailed topographic data.
For the streams studied by approximate methods, only the I- percent- annual- chance floodplain
boundary is shown on the FIRM. Approximate 1- percent annual- chance floodplain
boundaries were taken directly from the previous FIRMs for the City of Plainview (Reference
6) and the unincorporated areas of Hale County (Reference 15).
9
69
70
4.2 Floodways
Encroachment on floodplains, such as structures and fill, reduces flood carrying capacity,
increases flood heights and velocities, and increases flood hazards in areas beyond the
encroachment itself. One aspect of floodplain management involves balancing the economic
gain from floodplain development against the resulting increase in flood hazard. For purposes
of the NFIP, a floodway is used as a tool to assist local communities in this aspect of
floodplain management. Under this concept, the area of the 1- percent annual- chance
floodplain is divided into a floodway and a floodway fringe. The floodway is the channel of a
stream, plus any adjacent floodplain areas, that must be kept free of encroachment so that the
base flood can be carried without substantial increases in flood heights. Minimum Federal
standards limit such increases to 1 foot, provided that hazardous velocities are not produced.
The floodways in this study are presented to local agencies as minimum standards that can be
adopted directly or that can be used as a basis for additional floodway studies.
The floodways presented in this study were computed for certain stream segments on the basis
of equal- conveyance reduction from each side of the floodplain. Floodway widths were
computed at cross sections. Between cross sections, the floodway boundaries were
interpolated. The results of the floodway computations are tabulated for selected cross
sections (see Table 6, Floodway Data). In cases where the floodway and 1- percent annual-
chance floodplain boundaries are either close- together or collinear, only the floodway
boundary is shown.
Encroachment into areas subject to inundation by floodwaters having hazardous velocities
aggravates the risk of flood damage and heightens potential flood hazards by further
increasing velocities. A listing of stream velocities at selected cross sections is provided in
Table 6, "Floodway Data." To reduce the risk of property damage in areas where the stream
velocities are high, the community may wish to restrict development in areas outside the
floodway.
Along streams where floodways have not been computed, the community must ensure that the
cumulative effect of development in the floodplains will not cause more than a 1.0 -foot
increase in the BFEs at any point within the county.
The area between the floodway and 1- percent annual- chance floodplain boundaries is termed
the floodway fringe. The floodway fringe encompasses the portion of the floodplain that
could be completely obstructed without increasing the water surface elevation (WSEL) of the
base flood more than 1 foot at any point. Typical relationships between the floodway and the
floodway fringe and their significance to floodplain development are shown in Figure 1.
TABLE 6
71
HALE COUNTY, TX AND INCORPORATED AREAS
FEDERAL EMERGENCY MANAGEMENT AGENCY
I Feet above confluence with the White River
FLOODWAY DATA
INCREASE
(OOOOC0000rnrnrnoOao
o CD
WITH
FLOODWAY
O I� O I- Cn h V CO C0 CO 1 00 CO O
N CV ti n O C) 0) N N(OO
10 (n Ln L() 10 10 (0 (O CO r r- n 00
M 0) 01 M M 0) M M (701 MM
oi 0) (0 (0 (0 (0 (6 (0 C'7 0) (0 O (0
1- PERCENT ANNUAL CHANCE Fl
ELEVATION (FEE
WITHOUT
FLOODWAY
4 r` O t` t` n to r` 00 up CO CO N
C5 C5 O (O 0) NW r Li) 0)
(P) to Cn to (n U) Li) co CO N r- n r-
01 (0 (0 (0 01 (0 0) N (0 (00) (0 (0
(0 (0 0) (0 0) 07 (0 0) (0 (0 0) (0 (0
REGULATORY
4 r- O r r n (n N 00 L() CO CO N
O O (h (O CA N00 r r
Li) In 10 10 In to 10 (O (O t` t` n r-
01 (0 01 0) 0) (0 0) 0) (0 (0 (0 (0 00
(0 0) (0 0) 0) 0) 0) 0) (0 (0 (0 (0 0)
FLOODWAY
MEAN VELOCITY
(FEET PER
SECOND)
O r- co (0 00 0) (n U) r- 01 00 r (O
07 r r r r N M r ,t N N N N
SECTION AREA
(SQUARE FEET)
0 CO CO r- CO (0 0) 0 0) CO 'Cr
V CO 0) 0) N CO 0) (n r` 10 N
P-- N r N to O 0) CO r N O V'
N d' 4 V' N CV V N N (O N
(1333)
H1aIM
CD N
CD CD 0) C7 O r CD 00 V 0, COP. to CV 0 CD
dO
I FLOODING SOURCE
DISTANCE'
O O O O U) 0 0 0 0 0 0 0 0
(O 0 O (n r CO NO
r O n UP 00 r` d' OD 00 M r
(n (O t` o6 a; N 7 N.:NL.6000r-
4 .t In In co CO CO (0 r-
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CC 0
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TABLE 6
71
HALE COUNTY, TX AND INCORPORATED AREAS
FEDERAL EMERGENCY MANAGEMENT AGENCY
I Feet above confluence with the White River
FLOODWAY DATA
72
5.0 INSURANCE APPLICATION
Zone A
Zone AE
Zone AH
Zone X
e.- FLOODWAY
FRINGE
ENCROACHMENT
AREA OF FLOODPLAIN THAT COULD BE USED FOR
DEVELOPMENT BY RAISING GROUND
1 -PERCENT- ANNUAL CHANCE FLOODPLAIN
FLOOD ELEVATION WHEN
CONFINED WITHIN FLOODWAY
12
FLOODWAY
STREAM
CHANNEL
SURCHARGE
FLOODWAY,
FRINGE
ENCROACHMENT
D
FLOOD ELEVATION BEFORE
ENCROACHMENT ON FLOODPLAIN
LINE AB IS THE FLOOD ELEVATION BEFORE ENCROACHMENT.
LINE CD IS THE FLOOD ELEVATION AFTER ENCROACHMENT.
*SURCHARGE IS NOT TO EXCEED 1.0 FOOT (FIA REQUIREMENT) OR LESSER AMOUNT IF SPECIFIED BY STATE.
Figure 1 Floodway Schematic
B
For flood insurance rating purposes, flood insurance zone designations are assigned to a community
based on the results of the engineering analyses. These zones are as follows:
Zone A is the flood insurance rate zone that corresponds to the 1- percent annual- chance floodplains
that are determined in the FIS report by approximate methods. Because detailed hydraulic analyses
are not performed for such areas, no base (1- percent annual- chance) flood elevations (BFEs) or depths
are shown within this zone.
Zone AE is the flood insurance rate zone that corresponds to the 1- percent annual- chance floodplains
that are determined in the FIS report by detailed methods. Whole -foot BFEs derived from the detailed
hydraulic analyses are shown at selected intervals within this zone.
Zone AH is the flood insurance risk zone that corresponds to the 1- percent annual- chance shallow
flooding with a constant water surface elevation (usually areas of ponding) where average depths are
between 1 and 3 feet. The BFEs derived from the detailed hydraulic analyses are shown at selected
intervals within this zone.
Zone X is the flood insurance rate zone that corresponds to areas outside the 0.2- percent annual-
chance floodplain, areas within the 0.2- percent annual- chance floodplain, areas of 1 percent annual-
chance flooding where average depths are less than 1 foot, areas of 1- percent annual- chance flooding
where the contributing drainage area is less than 1 square mile (sq. mi.), and areas protected from the
base flood by levees. No BFEs or depths are shown within this zone.
6.0 FLOOD INSURANCE RATE MAP
The FIRM is designed for flood insurance and floodplain management applications.
For flood insurance applications, the map designates flood insurance rate zones as described in
Section 5.0 and, in the 1- percent- annual chance floodplains that were studied by detailed methods,
shows selected whole -foot BFEs or average depths. Insurance agents use zones and BFEs in
conjunction with information on structures and their contents to assign premium rates for flood
insurance policies.
For floodplain management applications, the map shows by tints, screens, and symbols, the I- and 0.2-
percent- annual- chance floodplains, floodways, and the locations of selected cross sections used in the
hydraulic analyses and floodway computations.
The current countywide FIRMs present flooding information for the entire geographic area of Hale
County. These countywide FIRMs also include flood-hazard information that was presented separately
on Flood Boundary and Floodway Maps (FBFMs), where applicable. Historical data relating to the
maps prepared for each community are presented in Table 7, "Community Map History."
13
73
FLOOD INSURANCE
RATE MAP
REVISION DATE(S)
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nformation purposes only. See separately published FIS for Lubbock County, Texas.
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COMMUNITY MAP HISTORY
FLOOD INSURANCE
RATE MAP
EFFECTIVE DATE
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BOUNDARY MAP
REVISION DATE(S)
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FEDERAL EMERGENCY MANAGEMENT AGENCY
HALE COUNTY, TX
AND INCORPORATED AREAS
INITIAL IDENTIFICATION
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7.0 OTHER STUDIES
Parkhill, Smith, and Cooper, Inc., have published two flood drainage reports for the City of Plainview
(References 16 and 17). A Flood Insurance Study and FIRMs were published in 1990 for the City of
Plainview in Hale County (Reference 6). The Flood Insurance Study for Lubbock County, Texas was
completed on September 28, 2007 (Reference 18). The results of this study are in complete agreement
with that study. No previous studies have been located for other incorporated areas, or the
unincorporated areas of Hale County.
This FIS report either supersedes or is compatible with all previous studies published on streams
studied in this report and should be considered authoritative for the purposes of the NFIP.
8.0 LOCATION OF DATA
Information concerning the pertinent data used in the preparation of this study can be obtained by
contacting, FEMA Region VI, Federal Insurance and Mitigation Division, 800 North Loop 288,
Denton, Texas 76209.
9.0 BIBLIOGRAPHY AND REFERENCES
1. U.S. Census Bureau, Hale County, Abernathy, Edmonson, Hale Center, and Petersburg,
Texas, Fact Sheets, Census 2000, http: /factfinder.census.gov accessed March 15, 2009.
2,
Texas State Historical Association, The Handbook of Texas Online, Hale County,
http://www.tshaonline.ora/handbooldonline/articles/HH/hchl.html accessed February 19,
2009.
3. U.S. Department of Agriculture, National Agricultural Statistical Service, Texas Field
Office, Hale County 2008 Agriculture Estimates,
http: /www.nass.usda.gov /Statistics by State/Texas/Publications /County Estimates /cec 1
89.pdf, accessed February 19, 2009.
4. Texas State Historical Association, The Handbook of Texas Online, Plainview, Texas,
http: www .tshaonline.org /handbook/online /articles /PP/hep 10.html accessed February 19,
2009.
5. Plainview, Texas Chamber of Commerce, Climate Page,
http://www.plainviewtexaschamber.com/statistics.html accessed February 19, 2009.
6. Federal Emergency Management Agency, Flood Insurance Study and Flood Insurance
Rate Map, City of Plainview, Hale County, Texas, Washington, D.C., March 16, 1989,
Revised June 18, 1990.
U.S. Department of Commerce, National Climatic Data Center, Storm Event Query for
Hale County, Texas, http: /www4.ncdc.noaa.gov /cgi- win /wwcgi.dll ?wwevent storms
accessed March 6, 2009
8. U.S. Army Corps of Engineers, Fort Worth District, Running Water Draw Flood
Protection Plainview, Texas, 1968.
15
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9. U.S. Department of Commerce, Weather Bureau, Technical Paper No. 40, Rainfall
Frequency Atlas of the United States, Washington, D.C., 1961, Revised 1963.
10. National Oceanic and Atmospheric Administration, National Weather Service, Technical
Memorandum NWS Hydro -35, Five to 60 Minute Precipitation Frequency for the Eastern
and Central United States, June 1977.
11. U.S. Army Corps of Engineers, Fort Worth District, Computer Program NUDALLAS,
Revised September 1982.
12. U.S. Army Corps of Engineers, Hydrologic Engineering Center, HEC -2 Water Surface
Profiles, Generalized Computer Program, Davis, California, April 1984.
13. National Geodetic Survey. VERTCON version 2.10. Silver Spring, MD. September 2003.
14. U.S. Department of the Interior, Geological Survey, 7.5- Minute Series Topographic Maps,
Scale 1:24,000, Contour Interval 10 Feet: Plainview, Texas, 1965; Wasson, Texas 1965.
15. Federal Emergency Management Agency, Flood Insurance Rate Map, Hale County, Texas
(Unincorporated Area), Washington, D.C., February 1, 1988.
16. Parkhill, Smith, and Cooper, Inc., Consulting Engineers, Storm Drainage Study, 1974.
17. Parkhill, Smith, and Cooper, Inc., Consulting Engineers, Community Development
Drainage Study, 1974.
18. Federal Emergency Management Agency, Flood Insurance Study, Lubbock County,
Texas, Washington, D.C., September 28, 2007.
ELEVATION IN FEET (NAVD)
w c,, c,, c., Ga u c., a c,, c,,
i, i, a i, i, u w w i, u
'N (N W 4 A U U cn m J
A N o (T 0 (l O U O U O
i
00 135,000 136,000 137,000 138,000 139,000 140,000 141,000 142,000 143,000 144,000 145,000 14 6, 000 147,1
STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH WHITE RIVER
7�
I
DE
LIMIT OF
STUDY
i
COUNTY
ROAD Y
st-
I
10% A
BNSF RR
'I
FM 400
o
0
0
01P
FEDERAL EMERGENCY MANAGEMENT AGENCY
HALE COUNTY, TX
AND INCORPORATED AREAS
FLOOD PROFILES
RUNNING WATER DRAW
77
ELEVATION IN FEET (NAVD)
CA w CA CA CA C,1 CA w (N u
L w CA CA CA C,+ w C,+ CA
(P (T C) Co J -,l CO
J CC 71 0 Ui 0 U1 0 CO 0 U1 0
000 148,000 149,000 150,000 151,000 152,000 153,000 154,000 155,000 15 6, 000 157,000 158,000 159,000 160,
STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH WHITE RIVER
S BEACH ST
S BROADWAY
ST
�J
BUSINESS
INTERSTATE-27
-LOOF
BUSINESS
INTERSTATE
LOOP
-27
I
JOLtET ST
1
QUINCY ST
1 10% ANNUAI
,y
0
0
0
02P
FEDERAL EMERGENCY MANAGEMENT AGENCY
HALE COUNTY, TX
AND INCORPORATED AREAS
FLOOD PROFILES
RUNNING WATER DRAW
78
ELEVATION IN FEET (NAVD)
w CA c.+ (.J u w (.J (.J (A
CA w w w CA u w w u
Cr, Ui CP 0) a, J J co 00 c0 (0
pO 0 Cn O 01 0 (P O 01
'I
X00 161,000 162,000 163,000 164,000 165,000 166,000 167,000 168,000 169,000 170,000 171,000 172,000 173,
STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH WHITE RIVER
4
4
1
CONFLLENCE
TO RU'NING
OF TR
WATER
BUTARY
DRAW
1
ENNIS ST
i
I
I
IN
FERSTATE -27
1
10% ANNUAI
COUPTY
ROAD T
U
US IIWY 70
C
)Y
LIMIT OF
ETAILED STU
0
0
0
03P
FEDERAL EMERGENCY MANAGEMENT AGENCY
HALE COUNTY, TX
AND INCORPORATED AREAS
FLOOD PROFILES
RUNNING WATER DRAW
79
ELEVATION IN FEET (NAVD)
w w w w w w w w w
w w w w i,+ w (1 a
0) O J J Co co t0 t0 O O
o Cn O 01 O 01 0 0) 0 0)
O
S111^4Il 31V2J0d2l0D M3IANIVId 1V3211SNMO0 3A08V 1333 NI 3DNVISI0 WV32i1S
1'C L 000'Z L 000' L L 000'01 000'6 000'9 000'L 000'9 000'9 000'17 000'c 000'Z 000' L
LETAILED
LIMIT OF
STUDY
i
1
itF
PLAYA
F
INDUSTRIAL.
BLVD
07
AYA D
INTERSTATE
-27
10% ANNUAL
LIMIT OF
DETAILED STUI
PLAYA E
cn
o
uj
F J
J
l
o
0
0
04P
FEDERAL EMERGENCY MANAGEMENT AGENCY
HALE COUNTY, TX
AND INCORPORATED AREAS
FLOOD PROFILES
TRIBUTARY A
80
ELEVATION IN FEET (NAVD)
W c..JJ w W W (A w c,J u
c, w w i, i, i,+ w w a
CT 01 0) J J 0o 0) O O
O C1 o 01 O 01 o 01 01 O
1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000 11,000 12,000 13,t
STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH RUNNING WATER DRAW
1
CCNFLUENCE
RUNNING
W
WATER
TF
DR
;W 3RD ST
FLOODING CI
RUNNING WA
J
II
1
1
Q
1
I
ENNIS ST
T
1
PLAYA
DETAILED
LIMIT OF
STU(
10% ANNUAL
0
0
0
05P
FEDERAL EMERGENCY MANAGEMENT AGENCY
HALE COUNTY, TX
AND INCORPORATED AREAS
FLOOD PROFILES
TRIBUTARY TO RUNNING WATER DRAW
81