03-09 - O5387 002895
TOWN OF PROSPER, TEXAS ORDINANCE NO. 03-09
AN ORDINANCE OF THE TOWN OF PROSPER, TEXAS PROVIDING FOR
COMPREHENSIVE DRAINAGE AND FLOOD CONTROL IN THE TOWN OF
PROSPER: PROVIDING A TITLE; DECLARING THE PURPOSE AND SCOPE;
ESTABLISHING STANDARD PROVISIONS FOR STORM DRAINAGE; FIXING
RESPONSIBILITY FOR DRAINAGE IMPROVEMENTS; ESTABLISHING
ENGINEERING DESIGN REQUIREMENTS; PROHIBITING CONSTRUCTION
OVER DRAINAGE FACILITIES OR IN FLOOD PLAIN; PROVIDING FOR
STORM WATER STORAGE; PROVIDING FOR BUILDING OR STRUCTURE
SET -BACK REQUIREMENTS; FIXING DUTIES OF THE TOWN ENGINEER
AND PROVIDING FOR AN APPEAL TO THE TOWN COUNCIL; PROHIBITING
THE ISSUANCE OF BUILDING PERMITS FOR NON-COMPLIANCE;
PROVIDING FOR CONTRACTOR MAINTENANCE GUARANTEE;
PROVIDING SAVINGS, REPEALING AND SEVERABILITY CLAUSES;
PROVIDING A PENALTY; PROVIDING FOR AN EFFECTIVE DATE OF THIS
ORDINANCE AND PROVIDING FOR THE PUBLICATION OF THE CAPTION
HEREOF.
WHEREAS, the Town Council of the Town of Prosper, Texas ("Town Council") has
investigated and determined that it would be in the best interest of the Town of Prosper, Texas
(the "Town") and its inhabitants to provide comprehensive drainage and flood control; and
WHEREAS, the Town Council finds that controlling drainage and flood waters in the
Town will help protect the health, safety and welfare of the citizens of the Town.
NOW, THEREFORE, BE IT ORDAINED BY THE TOWN COUNCIL OF THE TOWN
OF PROSPER, TEXAS:
SECTION 1: Findings Incorporated. The findings set forth above are incorporated into
the body of this Ordinance as if fully set forth herein.
SECTION 2: Adoption — Title. This Ordinance is hereby adopted and shall be known as
the "Official Drainage and Flood Control Ordinance" of the Town.
SECTION 3: Purpose and Scope. The purpose of policies and design standards set forth
herein is to insure adequate storm water drainage and flood control within the Town. The
policies and standards herein are intended to protect public health and safety, to prevent property
damage due to flooding, to equitably distribute the cost of necessary drainage improvements, and
to minimize the maintenance cost of drainage facilities constructed. Any development or
improvement of property affecting storm drainage and flood control in the Town is subject to the
provisions of this Ordinance.
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Drainage Ordinance
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The development of land shall consider all drainage elements normally used in the Engineering
Standards of design.
STORM WATER DESIGN SHALL CONSIDER THE MAXIMUM RESULTS FROM A 100 YEAR
FREQUENCY STORM. THE RELEASE RATE OF STORM WATER SHALL BE SUCH THAT THE FLOWS
OF RUNOFF WATER AFTER THE LAND DEVELOPMENT IS COMPLETED SHALL NOT EXCEED THE
FLOWS EXISTING BEFORE LAND DEVELOPMENT IS STARTED. IN CASES WHERE THE LAND
CONSIDERED FOR DEVELOPMENT IS ADJACENT TO A LAKE AND A DIRECT DISCHARGE SYSTEM
CAN BE DIRECTED INTO THE LAKE AREA, THEN THE INCREASED RUNOFF MAYBE ALLOWED TO
FLOW WITHOUT CONSIDERATION OF DETENTION SYSTEMS.
Where existing development is in place upstream of the land area under consideration for
development, provisions shall be made within the engineering design to provide capacities for
the potential full flows, which may be created by the upstream properties based on the result of a
100-year rainfall event.
All standards of the Corps of Engineers will be followed. The developer or his designee shall
certify that all standards of the Corps of Engineers have been met.
SECTION 4: Standard Provisions for Storm Drainage. All construction for storm
drainage in the development or improvement of real property within the Town shall conform to
the following standards and requirements:
A. Storm sewer inlets shall be provided along paved streets at such intervals which will
limit the depth of flow as follows:
SPREAD OF WATER
Type of Street Allowable Speed
Major Thoroughfare One traffic lane in each direction to remain open
Collector Street One moving traffic lane to remain open
Residential Street Maximum depth for design storm as shown on
Section VI herein (Fig. 2) is curb deep
B. A closed storm sewer system shall be required to accommodate a run-off exceeding
the street capacity, as provided above, up to and including the design capacity of a
seventy two inch (72") concrete pipe.
C. An open channel may be permitted to accommodate run-off exceeding the design
capacity of a seventy two inch (72") pipe, as provided below:
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(1) Channels draining an area with a "CA" factor (coefficient of run-off and
drainage area, as used in the hereinafter described "rational formula") of less than
600 shall be concrete lined to the design depth, plus six inch (6") freeboard except
that a closed system as provided above may be used. A twenty foot (20) wide
access easement shall be provided along at least one side parallel to channel.
(2) Channels draining an area with a "CA" factor between 600 and 1,000 shall be
improved to a capacity of the 100 year design discharge by excavation,
straightening and realignment, as required, and also the construction of a concrete
lined channel having a width of not less than the bottom width with concrete lined
to a depth of at least two feet (2'). Earthen side slopes shall be no steeper then
4:1, horizontal to vertical, and shall be sodded to prevent erosion.
(3) The setback for the building line shall be based on a minimum of 5 to 1
setback so that a minimum of twenty foot (20) of width access and maintenance
strip is provided parallel and adjacent to each side of the top bank of all drainage
channels in this section.
D. In lieu of the improvements of a channel draining an area with a "CA" factor in
excess of 1,000, the Town Council may elect to accept the dedication of all land
within the natural 100-year flood plain of the existing drainage channel as a
permanent right-of-way.
E. The Town may, in its sole discretion, apply the criteria for drainage
improvements as set forth in paragraphs A through D above to publicly owned
lands.
F. Excavation, fill and grading operations within the Town shall be undertaken only
after a proper permit has been obtained from the Town.
SECTION 5: Responsibility of Owner or Developer for Storm Drainage.
A. The owner or developer of property to be developed or used shall be responsible
for all storm drainage flowing through or abutting such property. This
responsibility includes, but is not limited to, the drainage directed to that property
by prior development, as well as the drainage naturally flowing through the
property by reason of topography. The owner or developer shall provide for
storm drainage in accordance with Section 4 above, at such time as any property
is proposed for development.
B. Where the improvement or construction of a storm drainage facility is required
along a property line common to two (2) or more owners, the owner hereafter
proposing development or use of his property shall be responsible for the required
improvements at the time of development, including, but not limited to, the
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dedication of all necessary right-of-way or easements, to accommodate the
improvements.
C. Where a property owner proposes development or use of only a portion of his
property, provision for storm drainage in accordance with Section 4 above shall
only be required in that portion of the property proposed for immediate
development or use, except as construction or improvements of a drainage facility
outside that designated portion of the property is deemed, by the Town's
Engineer, essential to the development or use of that designated portion.
D. The owner(s) shall dedicate to the Town the required drainage easements.
Determination of minimum easement required shall be made by the Town
Engineer.
E. In the event that an owner or developer desires to impound storm water by
excavation, filling or construction of a dam within a property, thereby creating a
lake, pond, or lagoon as a part of the planned development of that property, the
standard provisions for storm drainage as established in Section 4 of this
Ordinance shall not be applicable, provided:
1. an engineering plan for such construction, accompanied by complete
drainage design information, prepared by a registered professional
engineer, shall have been approved by the Town;
2. the owner or developer agrees to retain, under private ownership, the lake,
pond, or lagoon constructed, and to assume full responsibility for the
protection of the general public from any health or safety hazards related
to the lake, pond, or lagoon constructed;
3. the owner or developer agrees to assume full responsibility for the
maintenance of the lake, pond, or lagoon constructed;
4. the obligations herein run with the land, resulting in a continuing
obligation of the owner or owners of such land;
5. the requirements of the Texas Water Code pertaining to impoundment of
surface water are complied with, including, but not limited to, the design
construction and safety of the impounding structure; and
6. on any existing structure, the owner furnishes the Town with a study
proposed by a professional engineer for the Town's approval.
SECTION 6: Responsibility and Participation of the Town in Storm Drainage
Improvements.
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A. The Town may, in its sole discretion, participate in the cost of the improvements
required by this Ordinance in an amount not to exceed twenty percent (20%).
B. The Town may, in its sole discretion, participate in any project of improvements
required by this Ordinance by the levy of a special assessment against the lands to
be enhanced in value by such improvements.
C. The Town may acquire any drainage easement(s) necessary for the improvements
required by this Ordinance by dedication, purchase, or condemnation.
D. The Town shall, upon acquisition of the drainage easement and the completion of
improvements required by this Ordinance, assume full responsibility for the
maintenance of such drainage facilities.
SECTION 7: En 'nig eering Design. The design of all storm drainage facilities shall be in
accordance with the following criteria:
A. Design Frequency:
Drainage Facility
Storm Frequency
Closed Storm Sewer Systems
10 yr. with emergency 100 yr. overflow
Closed Storm Sewer System at
25 yr. with emergency 100 yr. overflow
Street Low Point or Sag
Culverts and Bridges
100 yr.
Concrete Lined Channels
50 yr. with emergency 100 yr. overflow
Earthen Channels
100 yr.
B. Computation of storm water run-off shall be by the "rational method", which is
based on the principle that the maximum rate of run-off from a given drainage
area for an assumed rainfall intensity occurs when all parts of the area are
contributing to the flow at the point of discharge. The formula for calculation of
run-off by the "rational method" is:
Q = CIA, where
Q = the maximum rate of discharge, expressed in cubic feet per second.
C = a run-off coefficient which varies with the topography, land use and moisture
content of the soil at the time the run-off producing rainfall occurs. This run-off
coefficient shall be based on the ultimate use of the land as recommended by the
Master Plan for the Town and shall be selected from Table I herein on the basis of
the use shown on the land use and zoning map of the Comprehensive Zoning
Ordinance for the Town. If an area has had a change of zoning to give the area
Page 5 Town of Prosper
Drainage Ordinance
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land use for which the "C" in Table II is higher than the use shown on land use
and zoning maps, the higher "C" factor shall be used.
For drainage areas where the use of the rational method does not provide reliable
data, a Unit Hydrograph Flow Determination shall be used. The use of a Unit
Hydrograph calculation will be based upon standard and accepted Engineering
Principles normally used in the Profession subject to the approval of the Town
Engineer.
I = Rainfall intensity in inches per hour from the applicable curves of Figure 1.
Time of Concentration or Duration of Rainfall for use in Figure 1 shall be
calculated by data shown in Table 2.
A = The drainage area, expressed in acres, contribution to the runoff at the point
in question. Calculation of the drainage area shall be made from a topographic
map, a copy of which shall be submitted with the engineering plans for Town
approval.
Computation of runoff shall be based on a fully developed drainage area, or
watershed, in accordance with the land use projected in the then current
comprehensive land use plan for the Town.
TABLE I
Slope
Land Use from Master Plan
Value of "C"
(Run-off Coefficient)
Flat 0% to 1 %
Park Areas - No Developable Land
0.20
Park and School Land Tract
0.30
Single Family Residential
0.40
Duplex
0.45
Multiple Family
0.50
Local Business
0.60
Central Business
0.75
Commercial
0.75
Industrial
0.70
Rolling 1 % to 3-1 /2%
Park Areas - No Developable Land
0.30
Park and School Land Tract
0.40
Single Family Residential
0.50
Duplex
0.55
Multiple Family
0.60
Local Business
0.70
Central Business
0.80
Page 6 Town of Prosper
Drainage Ordinance
Commercial
0.80
Industrial
0.75
Rough 3.5% and over
Park Areas - No Developable Land
0.35
Park and School Land Tract
0.45
Single Family Residential
0.60
Duplex
0.65
Multiple Family
0.70
Local Business
0.75
Central Business
0.85
Commercial
0.85
Industrial
0.80
Page 7 Town of Prosper
Drainage Ordinance
53U 002002
INSERT FIGURE 1
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INSERT FIGURE 2
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INSERT FIGURE 3
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AVERAGE VELOCITY FOR USE IN DETERMINING TIME OF CONCENTRATION
TABLE II
Description 0% to 3% 4% to 7% 8% to 11 % Over 12%
ofWater Course V in fp.s V in fp.s. V in . .s V in f.s
Surface Drainage 5 10 15 18
Channels Determine V by Manning's Formula
Storm Sewers Determine V by Manning's Formula
Average velocity of the runoff for calculating time of concentration or duration of
rainfall for use in Figure 1. These average velocities in this table shall be used
unless the designer shows calculation of velocity by streets and/or storm sewers.
Using the average velocities from this table the designer shall calculate the time
of concentration by the following formula unless more data are shown on the
plans for calculating time of concentration.
T = "Inlet Time" + D / (V*60) Where:
T = Time of concentration in minutes for use in Figure 1.
D = Distance in feet from point of concentration to upper end of drainage area
under consideration.
V = Velocity in feet per second from this table or velocity calculated by designer
by streets and/or storm sewers. "Inlet Time" = 5 minutes from property zoned for
multiple family, local business, central business, commercial, or industrial.
"Inlet Time" = 10 minutes for property zoned for parks, schools, single family
residential, and duplex.
C. The capacity of storm sewers, culverts, bridges, and open channels shall be
determined by the use of the Manning's Formula, and the design of the facility
derived accordingly. The Manning's Formula is:
Q= 1.486 R "' S 1 z *A Where:
n
Q = Discharge, expressed in cubic feet per second.
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Drainage Ordinance
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n = Roughness coefficient, based on condition and type of conduit lining.
S = slope of hydraulic gradient, expressed in feet of vertical rise per foot of
horizontal distance.
R = Hydraulic radius (area of flow divided by the wetted perimeter).
A = Cross sectional area of flow in conduit, expressed in square feet.
D. The construction of all concrete improvements shall be in accordance with the
standards set forth in the Paving and Drainage Specifications handbook of the
Town.
The frequency chart in years (Figure 1), the Inlet Capacity for low point inlets
(Figure2), the drainage capacity road sections (Figure 3), are hereby adopted as a
part of this Ordinance.
E. Complete engineering plans for storm drainage facilities shall be prepared by a
professional engineer, registered in the State of Texas, and experienced in civil
engineering work. The total cost for such engineering plans and specifications
shall be borne by the owner or the developer and shall be furnished to the Town
Engineer for his review.
F. In any development or improvement of property, the owner may be required to
provide, at his sole cost and expense, a preliminary drainage study for the total
area to be ultimately developed where the property is located, among any other
locations deemed appropriate by the Town Engineer, adjacent to or within an area
impacted by drainage within a designated flood prone area as identified by the
Federal Emergency Management Agency (FEMA). This study shall be submitted
to the Town Engineer prior to approval of the engineering plans for the total
development, or any increment thereof.
SECTION 8: Construction in Areas Subject to Flooding
A. No building or structure shall hereafter be erected or relocated within the 100 year
flood plains of the major drainage ways, unless the finished floor elevation of
such a building or structure is a minimum of two feet (2') above the high water
elevation calculated for the runoff from a rainfall having a design frequency of
100 years. In all other areas subject to flooding, the finished floor elevation shall
be a minimum of the high water elevation calculated for the runoff from a rainfall
having a design frequency of 50 years and shall not flood within the 100-year
frequency. The owner or developer shall furnish, at his sole cost and expense, to
the Town Engineer sufficient engineering design information to confirm that the
minimum floor elevation proposed complies with this paragraph.
B. No building or structure shall be erected or relocated within a flood plain or
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drainage channel, which will obstruct the natural flow of water within that flood
plain or channel.
C. No excavation, filling, or construction of embankment, or landscaping shall be
permitted within a flood plain or channel which will obstruct the natural flow of
the water within that flood plain or channel, unless sufficient engineering design
information is furnished to the Town Engineer, enabling the Town Engineer to
determine whether the same will adversely affect flow characteristics within that
flood plain or channel and/or result in damage to that or any other nearby
property, as solely determined by the Town.
SECTION 9: Building or Structure Set -Back Requirement. No building or structure
shall hereafter be constructed, reconstructed, or relocated within twenty feet (20') of any open
drainage channelso as to insure that an unobstructed width of at least feet (20') is maintained
between the top side slope of any such drainage channel and any building or structure.
SECTION 10: Construction Over Drainage Facilities. No building or structure shall
hereafter be constructed, reconstructed, or relocated over or across any storm drainage facility,
unless specifically approved by the Town Engineer pursuant to the criteria established in
paragraphs A and B of this section.
A. Construction of buildings or structures may be permitted over or across closed
drainage systems, to include concrete box culverts or reinforced concrete pipe.
Engineering plans and specifications shall be prepared by a Professional Engineer
registered in the State of Texas and experienced in civil engineering work. The
total cost and expense for such engineering plans and specifications shall be borne
by the owner or the developer and shall be furnished to the Town Engineer for his
review and approval.
B. Construction of pedestrian bridges or small vehicular crossings may be permitted
by the Town Engineer. Engineering plans and specifications shall be prepared by
a Professional Engineer registered in the State of Texas and experienced in civil
engineering work. The total cost and expense for such engineering plans and
specifications shall be borne by the developer and shall be furnished to the Town
Engineer for his review and approval.
SECTION 11: Storage.
A. General — Storm water management programs aimed at controlling increased
stream water runoff generated by development are a top priority in urban
watershed planning. More frequent flooding, increased rates and volumes of
storm water runoff, increased stream channel erosion and degradation, increased
sedimentation, and increased water pollution are all problems intensified by
increased storm water runoff resulting from development. Storage of excess
urban storm runoff shall be provided to prevent urban flood damage.
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Drainage Ordinance
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Storm runoff storage with reduced release rates can hold downstream flood flows
to within the safe conveyance capacity of the storm sewer and stream system. In
most cases it can be shown that storage is more economical than increasing
downstream conveyance capacity. Storage facilities shall be planned, designed
and provided to assure an effective and efficient operation and maintenance
program.
Retention and detention are two generalized types of storm runoff storage used to
control flooding. Retention storage refers to storm runoff collected and stored for
a significant period and released or used after storm runoff has ended. Retention
storage usually consists of "wet reservoirs" which often have agricultural,
recreational, and/or aesthetic value. Detention storage consists of reducing the
rate of runoff for a short period of time to reduce peak flows by controlling the
discharge through an outlet structure and by extending the period of runoff.
Skillful use of the procedures outlined in this section will assist in providing
compliance with the drainage policy requirements set forth herein.
B. Storage Classification. Storage can be classified by location as follows:
(1) Rainfall Storage. The storage of water near the point of rainfall
occurrence or before storm runoff accumulates significantly. Rainfall
storage is usually accomplished by roof top ponding, parking lot ponding,
property line swale ponding, and small on -site ponds.
(2) Runoff storage. Water stored after storm runoff has accumulated
significantly and begun to flow in a drainage system. Runoff storage is
usually accomplished by off stream storage, channel storage, or onstream
storage.
C. Rainfall Storage.
(1) Roof Tops. The building codes require roof load design for rain and
snow. The design load may be converted to equivalent water depth in
inches, which can be safely contained on flat roofs. The maximum storage
allowed for design purposes shall not exceed this depth unless a building
is designed to withstand a greater roof load. The depth of water must be
controlled by proper sizing of downspouts and by constructing scuppers
through the parapet walls.
The possibility of overflows exist and will occur quite often during major
storms. Overflow drains shall be used to protect against roof overloading.
Periodic inspection and proper maintenance will reduce the possibility and
Page 14 Town of Prosper
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W
the hazards of overflows.
Special attention must be given to the water tightness of the roof to assure
that no leakage occurs due to the accumulation of water.
(2) Parking Lots. Considerable area in urban development is occupied by
parking lots. These paved areas must provide adequate storm water
detention.
There are two general methods of storm water detention that can be
utilized on parking areas. One form involves the storage of runoff in
depressions constructed near drains or outfall structures. The second
method of storm water detention on parking lots consists of using the
paved parking areas to channel storm water to grassed or gravel filled
areas for maximum infiltration and decrease in overland flow.
(3) Recreation Areas. Recreation areas, such as sports fields, generally have a
substantial area of grass cover which often has a high infiltration rate.
Storm runoff from such fields is minimal. A secondary use of such
recreation fields can be made by providing for limited detention storage of
runoff from adjacent areas.
Since these areas are not used during periods of precipitation, detention
ponding should not seriously impede their primary use. The recreation
area shall be designed so that it will thoroughly drain. In addition, the
vegetation used on the area shall be tolerant of periodic inundation and
wetness.
(4) Property Line Swales. Subdivision planning and layout requires adequate
surface drainage away from buildings. This is obtained by sloping the
finished grade in all directions away from the building. The layout often
calls for a swale to be located along the back property line, which then
drains longitudinally through the block. Where this is used, the design
shall include a concrete flume section with baffles to slow the flow of
water yet maintain constant point for discharge.
Temporary ponding facilities along the rear lot line may include small
controlled discharges along the back property line or, if the subsoil
conditions are favorable, several inches of rainfall could be expected to
percolate into the ground during and after a storm.
Prior to planning for property line swale ponding, the engineer should
determine that saturation of the subsoil will not have an adverse effect on
building foundations. In cases where significant subsoil problems exist,
water shall not be ponded or percolated into the ground.
Page 15 Town of Prosper
Drainage ordinance
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(5) Combinations. In many instances, one on -site detention method cannot
conveniently or economically satisfy the required or needed amount of
storm water storage. Limitations in storage capacities, site development
conditions, soils limitations and other related constraints may require that
more than one method be utilized. For example, roof top, parking lot, and
surface pond storage might all be required to compensate for the increase
in runoff due to development of a particular site. Whatever combinations
deemed suitable by the Town Engineer may be incorporated into a site
development plan.
D. Runoff Storag .
(1) Offstream Storage. The storage of water in depressed open areas, in
reservoirs, and on low lying recreation fields to which storm peak flows
are routed is usually termed offstream storage. It is usually characterized
by a side channel spillway or overflow from the main channel.
(2) Channel Storage. Although all channels inherently store water, channels
can be made to attenuate runoff by altering their hydraulic characteristics
in a way that will reduce peak flows. Side channels that run essentially
parallel to the main stream channel are also a means of temporarily storing
water during excessive rainfall events.
(3) Onstream Storage. The construction of an embankment across a channel
so that a storage pond is formed represents offtream storage. Spillway
considerations are important to pass large floods exceeding the storage
capacity. Properly protected roadway embankments are well suited for
this purpose.
E. Multipurpose Use. Rainfall storage and runoff storage systems are most practical
when designed for multi -purpose use. For maximum land use efficiency the
design engineer must consult early with the Planning Department and the Parks
and Recreation Department of the Town.
(1) Lower Cost Recreation - Making use of detention storage areas as parks
and greenbelts, ball fields and playing fields, satisfies two needs and
reduces the cost of each. The mini -park concept, where small recreational
areas are provided in neighborhoods within safe walking distances for
children, can be a typical joint effort of the drainage design engineer and
the planning and recreational staffs of the Town. Provisions must be made
for maintenance of such areas.
(2) Multi -Use Criteria - The multiple use of storage areas is a field of
endeavor where the fervent disciplines shall develop desirable and
acceptable criteria fitting the needs of the local community. It is with
storage, including both detention and retention storage, that an important
Page 16 Town of Prosper
Drainage Ordinance
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potential exists for the reduction of flooding, drainage costs, and to some
degree recreation costs.
F. Hydraulic Design Criteria.
(1) General. Hydraulic and hydrologic design criteria provide the guidelines
for design and construction of storm water storage facilities. These
criteria are a necessary part of a storm water management program needed
to protect low-lying areas by preventing unacceptable increases in runoff
rates as urban development progresses. The engineer shall be familiar
with the drainage policy of this ordinance before considering the
feasibility of a storm runoff detention facility. Existing land contours of
the property should be a consideration in developing the drainage plan. In
many instances, storage can be achieved economically by blocking the
overland flow of storm water runoff with various land forms, curbs, walls,
terraces, and other means. The amounts to designing a drainage system
that will minimize the reduction in the critical time of concentration as the
property is developed.
A drainage project located in a watershed that has a master plan may
involve additional considerations, which require review. Consultation
with the Town is required to insure compliance with the overall watershed
master plan.
(2) Design Factors and Procedures. Before proceeding with engineering
design of an on -site storage facility, the physical and technical factors
shall be identified and the basic design procedures established. Design
factors and procedures are as follows:
a. The drainage plans for a particular storage facility shall include all
property lines, topography, area, location, and all other items
necessary to meet policy requirements outlined in the "Drainage
Policy for the Town".
b. The storage facility shall be designed and located in a manner
which insures safety and ease of maintenance.
C. The rate of inflow to the storage facility (inflow hydrographs) and
all hydrologic considerations must assume ultimate development
of the site's contributing area. Several inflow hydrographs shall be
prepared to examine their effect on downstream flooding for the
various design storm frequencies. The number of inflow
hydrographs to be provided may vary but should always
adequately describe the range of flows expected for the design
storm frequencies. These various design storm inflow hydrographs
and an acceptable flood routing procedure will be necessary in
Page 17 Town of Prosper
Drainage Ordinance
sizing the outlet works for the storage facility. An emergency
spillway shall be provided to pass runoff that exceeds the design
capacity of the detention facility.
d. The maximum allowable release rate from a storage facility is
based on a 100-year event. However, specific site conditions may
require that additional consideration be given a particular area.
The Town Engineer shall be contacted to identify special design
conditions. The maximum allowable peak flow released from a
particular site is selected to comply with the policy section of this
manual. In all cases, the maximum release rate shall be calculated
using the hydraulic gradient created when the storage area is being
utilized at full capacity.
Key items to consider in determining the maximum allowable
release rate are: i) the peak flow rates for the various design storm
frequencies prior to development; ii) the capacity of the
downstream storm water channel or storm sewer; iii) compliance
with a master plan for the watershed; iv) problems, if any, that are
created onsite by the storage of storm water runoff, and v)
potential problems created downstream when the onsite storage
capacity is fully utilized and the excess runoff flows overland into
downstream areas.
e. The storm water storage volume required is given by the maximum
difference, at any time, between cumulative total inflow volume
and cumulative outflow volume measured from the beginning of
inflow for a 25-year storm. The maximum allowable release rate is
not to be exceeded by the outflow peak discharge.
f. The outfall or outlet structures shall be designed on the basis of
inlet or outlet control, whichever is applicable. The structures shall
be capable of safely and properly passing the flow range of design
storm frequencies including the 100-year storm without causing
downstream flooding or exceeding the maximum allowable release
rate. Outlet works must also pass all of the runoff from the 100-
year design storm within a reasonable length of time or a permit
may be required from the Texas Commission on Environmental
Quality (TCEQ). Wet ponds will in many cases also require a
permit from the TCEQ.
g. Special attention shall be given to the provision of an emergency
or overflow spillway which would pass excess flows greater than
those of the 25-year design storm and overflows caused by
clogging of the principal outlets. It is advisable to contact the
state agencies such as the Texas Water Development Board
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Drainage Ordinance
5387 002913
(TWDB) and the TCEQ when planning a storage facility in order
to meet their criteria.
G. Hydraulic Design Methods.
(1) General. The two basic methods suggested for predicting the volume of
runoff with time and the peak flow rate are the Rational Method and the
Standard Method. The Standard Method is best suited for storage analysis
of urban runoff but for relatively small drainage areas some form of the
Rational Method if generally acceptable.
(2) Rational Method Storage Analysis. When designing storage facilities for
an area smaller than 400 acres, it is often justifiable to use the Rational
Method to compute the design inflow hydrographs.
One of the Rational Method techniques has been utilized by the Federal
Aviation agency in designing airport drainage facilities. The procedure is
presented in "Airport Drainage", prepared by the Federal Aviation Agency
(FAA, 1966). The FAA technique is basically a graphical procedure,
which represents the cumulative storm runoff volume and the cumulative
volume released from the storage facility through an outlet structure as
functions of time. The maximum difference between the two volume
curves represents the required storage volume of the storage basin. The
procedure will consistently result in under designed storage facilities if a
constant release rate is assumed from time zero. This is caused by sizing
the outlet pipe using the Manning Equation and not recognizing the stage -
discharge relationship. A reservoir routing technique unitizing the stage -
discharge relationship of the storage facility should be used. It is
recommended that in most instances the contributing drainage area not be
more than 25 acres when using this technique.
A second technique that employs the Rational Method is referred to as the
Modified Rational Method Analysis. This technique manipulates the
Rational Method to reflect the fact that storms with durations greater than
the normal time of concentration for a basin will result in a larger volume
of runoff even though the pear discharge is reduced. Even though rainfall
intensities and resulting peak discharges associated with longer duration
storms are less than those for short duration storms, the inflow may still be
considerably greater than the outflow thus requiring more storage than in
the case of shorter, higher intensity storms. This approach becomes more
valid on progressively smaller basins, The technique should, therefore, be
limited to relatively small areas such as parking lots, roof tops, or other
upstream facilities with contributing areas less than 25 acres.
Page 19 Town of Prosper
Drainage Ordinance
5333 002-9114
SECTION 12: Detention Facilities.
A. Intent. The Town of Prosper encourages the use of detention basins based on the
multi -faceted benefits of the community outlined below:
(1) Control of Flood Discharges: The intent of detention basin (storage)
design shall be to reduce flood discharges for the ultimate watershed
development conditions without increasing peak discharges above the
peak discharges for undeveloped watershed conditions. This storage
method serves as a key strategy for the storm water management plan.
(2) Environment: As development occurs, there is a loss of wildlife and bird
life habitat. It is possible to create a natural micro -environment around
ponds that can offset this loss of habitat. These "natural" environmental
pockets in conjunction with natural open space areas can help maintain the
rural setting of the Town.
Detention Ponds also benefit downstream water quality by allowing the
sedimentation of pollutants.
(3) Recreation: Detention basins offer many recreational opportunities in an
urban setting; for example, a normally dry detention basin could be used
for athletic fields or picnics areas, while the banks of the pond offer
valuable park space.
(4) Aesthetics: As an integral part of the Town of Prosper, a detention basin
needs to blend into the landscape and into the community. Simple yet
inexpensive measures, such as gentle side slopes, planting of trees and
shrubs, and other landscaping features can transform the detention facility
into an attractive amenity for the neighborhood.
B. Requirements.
(1) Detailed engineering studies of the entire basin shall be required to
evaluate the timing of hydrographs from regional and on -site facilities, as
well as backwater calculations to determine the effect of the
detention/retention facilities on upstream water surface elevations.
(2) All detention facility designs shall be performed by a professional
engineer registered in the State of Texas and shall meet the requirements
of Permanent Rule 31, Texas Administration Code (TAC) Chapter 299,
and other requirements, as applicable.
(3) The minimum amount of storage volume of the detention basin shall be
that volume required to reduce runoff rate to the undeveloped condition
rate. Dedicated detention basins shall also include an additional one foot
Page 20 Town of Prosper
Drainage Ordinance
5387 002915
(1') of freeboard and two feet (2') of sediment storage. The volume of
runoff storage for drainage areas greater than 160 acres shall be compared
using unit hydrograph procedures. Acceptable unit hydrograph
procedures include the Soil Conservation Service Dimension less Unit
Hydrograph and Snyder's Unit Hydrograph. Manual methods or use of
the computer programs TR20, HEC-1, and NUDALLAS are allowed for
runoff hydrograph computation and flood routings. The criteria contained
in this section shall serve as the minimum requirements for detention basin
design. For drainage areas less than 160 acres, the above methods are
recommended; however, an approximate routing method may be used
subject to approval of the Town Engineer.
(4) The maximum allowable release rate from any site shall be equal to the
100-year peak runoff rate prior to site development. The maximum design
release rate may be less.
(5) Where storm water management improvements are required in the natural
floodway or a permanent greenbelt or open space area, they shall be
incorporated into existing lakes, or they shall be designed in as small an
area as feasible to create natural contours. Note, however, that detention
basins or retention ponds shall be a minimum of one acre in size to allow
for proper maintenance, side slopes and outlet work operation.
(6) Retention/Detention ponds shall resemble natural ponds; in addition:
a. The pond shall expand gradually from the inlet towards the outlet,
insuring that there are no "dead zones". That is, water entering the
pond gradually spread out and uniformly displaces the water
already present in the pond.
b. The length -to -width ratio shall be 3 to 1 or greater, to provide a
long flow path.
C. The average permanent pond depth shall be greater than five (5)
feet, where possible.
d. A ten (10) to twenty (20) foot wide shallow bench shall be
provided along the shores of the permanent pond for safety and to
encourage the development of bottom growth in these areas. This
vegetation will enhance the biologic treatment characteristics of
the pond and also enhance the "natural" appearance of the pond.
(7) If several ponds are required, they shall vary in size and shape, and be
separated by tree groves, vegetated berms, or similar screening of a natural
appearance.
Page 21 Town of Prosper
Drainage Ordinance
5381 002916
(8) When landscape are required by the Town Engineer, the materials shall
enhance wildlife habitat.
(9) Where slope erosion protection is needed for the side slopes of a pond,
rock or geotextiles are required as approved by the Town Engineer.
Exposed concrete surfaces shall be faced with embedded rock or aggregate
masonry. Bare concrete shall only be permitted with the express written
permission of the Town Council. Side slopes should be no steeper than
4:1 where feasible for reasons of public safety and maintenance.
(10) Detention facilities of less than 10 acre-feet of flood storage shall have
outlet structures designed for the 100-year frequency storm. Facilities
greater than 10 acre-feet of flood storage shall have outlet structures
designed for the 10-year and 100-year frequency storms. The release rates
shall be such that the flows after land development are no larger than the
flows before land development.
(11) Outlets shall be provided with a trash rack to prevent plugging with debris
and to provide safety to the public. Due to unique design considerations,
the Town Engineer may approve alternative outlet design.
(12) All Federal, State and County laws pertaining to the impoundment of
surface water shall have been compiled with, including, but not limited to,
the design, construction and safety of the impounding structure. Copies of
any Federal, State or County permits issued for the proposed
impoundments shall be submitted to the Town Engineer.
(13) All detention/retention facilities shall include an additional one foot (1') of
freeboard and two feet (2') of sediment in determining the design flood
elevation.
(14) Provisions (such as emergency spillways or reinforcing of embankments)
shall be made for the occurrence of overtopping or failure of the outlet
structure. Under no circumstances should the emergency overflow have a
direct path to any buildings or other structures used for human occupancy,
commerce, or industry. Details of these provisions shall be supplied to the
Town Engineer for approval.
(15) The flood storage volume of detention/retention facilities shall be
designed to empty in a maximum of 12 hours if said facilities are to be
considered an erosion/pollution control facility.
(16) Where required by the Town Engineer, the placement of aerators and/or
the stocking of retention ponds with fish shall be used to control algae
growth and/or insects.
Page 22 Town of Prosper
Drainage Ordinance
5387 002917
(17) Inlet structures shall be designed to both dissipate the flow energy and
drop the inflow elevation to below that of the pond's water surface or
basin's flow line.
SECTION 13: Duties of the Town and Appeal to the Council. The interpretation of the
criteria herein above set forth in this Ordinance shall be made by the Town Engineer. Any
person adversely effected by the decision of the Town Engineer may, within ten (10) days from
the date of such decision, file an appeal in writing to the Town Council. Such appeal shall be
filed with the Town Engineer and the Town Secretary and shall define the specific areas of
controversy. The Town Council will attempt to hear any such appeal within thirty (30) days
from the date it is received by the Town Engineer and Town Secretary.
SECTION 14: Building Permits to be Withheld. No Building Permit shall be issued, nor
Certificate of Occupancy approved for any construction, reconstruction, or development upon
any land where such construction, reconstruction or development is not in conformity with the
requirements and intent of this Ordinance. Anyone who violates any of the terms and provisions
of this Ordinance shall, in addition to any other remedies, civil or criminal, be denied a Building
Permit and/or a Certificate of Occupancy, until the violation is corrected.
SECTION 15: Savings/Repealing Clause. All provisions of any ordinance in conflict
with this Ordinance are hereby repealed to the extent they are in conflict; but such repeal shall
not abate any pending prosecution for violation of the repealed ordinance, nor shall the repeal
prevent a prosecution from being commenced for any violation if occurring prior to the repeal of
the ordinance. Any remaining portions of said ordinances shall remain in full force and effect.
SECTION 16: Maintenance Guarantee. A Contractor performing any improvement(s)
required under this Ordinance shall guarantee the work, which he does against defective
workmanship and materials for a period of two (2) years from the date of final acceptance of the
work by the Owner/Town.
Where defective workmanship and/or materials are discovered requiring repairs to be made
under this guaranty, all such repair work shall be done by the Contractor at his own expense
within five (5) days after written notice of such defect has been given to him by the
Owner/Town. Should the Contractor fail to repair leaks or correct such defective workmanship
and/or materials within five (5) days after being notified, the Owner/Town may make the
necessary repairs and charge the Contractor with the actual cost of all labor and materials
required.
The Contractor shall arrange to have his faithful performance bond run for a period of two (2)
years after the date of completion of the construction work to cover his guaranty as set forth
above.
SECTION 17: Severability. Should any section, subsection, sentence, clause or phrase of
this Ordinance be declared unconstitutional or invalid by a court of competent jurisdiction, it is
expressly provided that any and all remaining portions of this Ordinance shall remain in full
force and effect. Prosper hereby declares that it would have passed this Ordinance, and each
Page 23 Town of Prosper
Drainage Ordinance
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5387 002918
section, subsection, clause or phrase thereof irrespective of the fact that any one or more
sections, subsections, sentences, clauses and phrases be declared unconstitutional or invalid.
SECTION 18: Penalty Provision. Any person, firm, corporation or business entity
violating this Ordinance, or as amended, shall be deemed guilty of a misdemeanor, and upon
conviction thereof shall be fined a sum not exceeding Two Thousand Dollars ($2,000.00). Each
continuing day's violation under this Ordinance shall constitute a separate offense. The penal
provisions imposed under this Ordinance shall not preclude Prosper from filing suit to enjoin the
violation. Prosper retains all legal rights and remedies available to it pursuant to local, state and
federal law.
SECTION 19: Effective Date. This Ordinance shall become effective from and after its
adoption and publication as required by law.
PASSED AND APPROVED by the Town Council of the Town of Prosper, Texas, on this
19* day of MCW01' 2003.
O... ,.,,.,,
,0....
'AT�' : A-NpCORRECTLY
r RE
AMBER PHILLIPS,
Town Secretary
J ES DUNMIRE, Mayor
Date of Publication: (McKinney Courier Gazette)
Page 24 Town of Prosper
Drainage Ordinance
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5387 002920
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Figure 2
9 DATE APPROVED
5387 002922
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ANY PROVISION HEREIN WHICH REBrICTS THE SALE, RENTAL, OR USE OF THE
DESCRIBED REAL PROPERTY BECAUSE OF COLOR OR RACE IS INVALID AND
UNENFORCEABLE UNDER FEDERAL LAW (COUNTY OFCOLLIN)
(THE STATE OF TEXAS)
hereby certify that this instrument was FILED in the File Number Sequence on the date
and the time stamped hereon by me; and was duly RECORDED, in the Official Public
Recordsof Real PraRany of Collin County, Texas on
APR 01 2003
d o�
r
Brenda Taylor =�o
F-i jid ft r %or� pn:
('n in oLM y, c i nney TX
Honorable Brenda Taylor
Collin County Clerk
On Ate 11: 01 a n003
DC.)CMLIM : 2003- 0057603
Recording/Type:GR 63.00
Receipt #: 12195
PUSL = S HER ' S AFF = DAV = T
THE STATE OF TEXAS
COUNTY OF COLLIN
Before me, this undersigned authority, on this day personally appeared Jim Moser who being by me duly sworn, deposes
and says that he is the Publisher of The M-cKinney Cburier-Gazette and that said newspaper meets the requirements of
Section 201.004, 201.005 and 201.006 of the Texas Government Code, to wit:
Printer's Fee $ c� /
" . No. e9,3 — U 2 Description:
1. It devotes not less than twenty-five percent (251) of its
total column lineage to general interest items;
2. it is published at least once each week;
3. it is entered as second-cIass postal matter in the county
where it is published;
4. it has been published regularly and continuously since
1897; and
5. it is generally circulated within Collin County.
Publisher further deposes and says that the attached notice was published in said newspaper on the following date(s)
to wit;
Jim Moser
Editor and Publisher
SUBSCRIBED AND SWORN BEFORE ME by Jim Moser who
✓ a) is personally known to me, or
2003 AD
b) provided the following evidence to establish his/her identity,
on this the � day of D. 2003 certify which witness my ha and seal of office.
Notary Pu ic, State of Texas
(SEAL)
COMMISSION EXPIRES
ELAVER:NEGRAVESNotate of Texas+� on Expires'`2005
To be published in the
McKinney Courier -Gazette on
Friday, March 21, 2003.
LEGAL NOTICE
TOWN OF
PROSPER,TEXAS
ORDINANCE NO. 03-09
AN ORDINANCE OF THE
TOWN OF PROSPER, TEXAS
PROVIDING FOR
COMPREHENSIVE
DRAINAGE AND FLOOD
CONTROL IN THE TOWN OF
PROSPER; PROVIDING A
TITLE; DECLARING THE
PURPOSE AND SCOPE;
ESTABLISHING STANDARD
PROVISIONS FOR STORM
DRAINAGE; FIXING
RESPONSIBILITY FOR
DRAINAGE
IMPROVEMENTS;
ESTABLISHING
ENGINEERING DESIGN
REQUIREMENTS;
PROHIBITING
CONSTRUCTION OVER
DRAINAGE FACILITIES OR
IN FLOOD PLAIN;
PROVIDING FOR STORM
WATER STORAGE;'
PROVIDING FOR BUILDING
OR STRUCTURE SET -BACK
REQUIREMENTS; FIXING
DUTIES OF THE TOWN
ENGINEER AND PROVIDING
FOR AN APPEAL TO THE
TOWN COUNCIL,
PROHIBITING THE
ISSUANCE OF BUILDING
PERMITS FOR NOW
COMPLIANCE; PROVIDING
FOR CONTRACTOR
MAINTENANCE
GUARANTEE, PROVIDING
SAVINGS; REPEALING AND
SEVERABILITY CLAUSES;
PROVIDING A PENALTY;
PROVIDING FOR AN
EFFECTIVE DATE OF THIS
ORDINANCE AND
PROVIDING FOR THE
PUBLICATION OF THE
CAPTION HEREOF.