HomeMy WebLinkAboutOrdinances (O-87-666)-01/18/1987
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ORDINANCE NO. 0-87-666'"
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AN ORDINANCE AMENDING CHAPTER 9 OF THE COLLEYVILLE CODE BY
ADDING THERETO A SECTION 12, ESTABLISHING A DRAINAGE POLICY FOR
THE CITY OF COLLEYVILLEi PROVIDING A PENALTY AND AUTHORIZING
PUBLICATION.
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WHEREAS, the City Council is of the op~n~on that the City of
Colleyville should adopt a Drainage Policy and
require development within the City to conform to
said policYi NOW THEREFORE
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BE IT ORDAINED BY THE CITY COUNCIL OF THE CITY OF COLLEYVILLE,
8 TEXASi
Sec. 1:
THAT Chapter 9 of the Colleyville Code be amended by
adding thereto a section 12 providing as follows:
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"DRAINAGE POLICY OF THE CITY OF COLLEYVILLE"
DEFINITIONS
Unless specifically defined below or in the Flood Hazard
Area Regulations of the City of Colleyville or the city of
Fort Worth Storm Drainaqe and Desiqn criteria Manual,
words or phrases used in this policy shall be interpreted
to give them the meaning they have in common usage and to
give this policy its most reasonable application.
A. Backwater zone - area inundated by the 100 year
frequency storm due to a backwater condition from
existing or proposed drainage structures.
B. City Manager - City Manager of the City of
Colleyville or his designee as identified in writing.
C. Fully Developed Conditions - fully developed
conditions shall assume the following:
a. Areas which have been developed within a
watershed shall reflect current land use unless
otherwise directed by the City Manager.
b. The existing undeveloped areas of a watershed
shall be assumed to be developed in accordance
with the Future Land Use Map of Colleyville in
effect at the time of construction. If the
anticipated development is unknown, a minimum
weighted runoff coefficient of 0.65 shall be
assumed unless otherwise directed by the City
Manager.
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D. Natural Creeks - those drainageways that are
unimproved, that exhibit a meandering course, and
that have an upstream watershed greater than one (1)
square mile (640 acres).
E. Overflow - Water from a storm whose design frequency
is 100 years less the capacity of the design storm
sewer.
F. Public Water - the concentration of surface water
resulting from a storm whose design frequency is 100
years or less flowing through or from public land,
right-of-way or easements. Public water must be
contained within a dedicated right-of-way, floodplain
easement, or drainage easement.
G. storm Drainage Facilities - storm drainage facilities
are any and all elements of a drainage system
consisting of streets, alleys, storm sewers,
channels, culverts, bridges, swales and any other
facilities through which or over which public water
flows; all of which the city must have a right in,
either in the form of a dedicated right-of-way,
floodplain easement or drainage easement.
H. Swale - shaped cross-section contained within an
easement which provides capacity in combination with
a storm sewer pipe to carry the 100 year frequency
storm.
II.
STORM DRAIN DESIGN PARAMETERS
A. General-
1. Flood Hazard Area Regulations of the City of
Colleyville must be complied with.
2. Storm drainage facilities shall be designed in
accordance with the definitions, formulas,
criteria and data as set forth in the city of
Fort Worth Storm Drainaqe criteria and Desiqn
Manual. In cases of conflict this policy shall
govern.
3. The Hydraulic Manual prepared and compiled by
the Texas Highway Department's Bridge Division,
and dated September, 1970, with subsequent
revisions may be used in cases not covered by
the city of Fort Worth Storm Drainaqe criteria
and Desiqn Manual or this policy.
4. In special cases alternate studies and/or
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designs may be required by the city. These
cases shall be reviewed on an individual basis.
Methods, criteria, etc... shall be pre-approved
by the city Manager. Additional documentation
may be required to support the application.
5. Any design parameter or design criteria found in
the Manuals or this Policy, may be waived by the
City Manager only after a request for such
waiver is made in writing to the city Manager
and a determination has been made that there are
circumstances meriting this waiver. All waivers
must be documented in writing by the City
Manager. In most cases the parameters presented
in this policy shall apply and prevail.
6. All storm drainage facilities shall be designed
assuming fullY developed conditions.
7. Drainage areas shall conform to the natural
topography of the watershed tributary to the
proposed storm drainage facilities.
8. Time of Concentration:
a. Under average conditions the time of
concentration to the upstream end of a drainage
system shall coincide with Table II-2 "Minimum
Inlet Time of Concentration", page II-7, city of
Fort Worth storm Drainaqe criteria and Desiqn
Manual.
b. Under unusual circumstances which will
produce times of concentration in excess of
those shown in Table II-2, the time of
concentration shall be determined through the
use of Figure II-I, "Nomograph for Time of
Concentration", Page II-6, city of Fort Worth
storm Drainaqe criteria and Design Manual. This
nomograph, however, must be used in a judicious
manner; otherwise unrealistic times of
concentration will result. Some cautions to be
exercised in the use of this nomograph are as
follows:
i. The path along which the time of
concentration is determined, should be
representative of the drainage area as a
whole. On some irregularly shaped drainage
areas it is possible to find the time of
concentration along a particular path which
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is representative of only a small portion
of the drainage area. This time of
concentration may greatly exceed the time
of concentration which is more
representative of the drainage area as a
whole.
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ii. Overland flow shall be considered
channelized at such time as the distance
traveled exceeds 200 feet.
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c.
When the watershed in question is basically
undeveloped, the engineer shall assume fully
developed conditions and attempt to anticipate
future storm sewer locations and take the
resulting velocities into consideration when
determining the time of concentration.
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If runoff is changed from its natural course, the
change must be designed in such a manner that neither
upstream or downstream properties will receive a
negative impact. When the change requires the
regrading of land, a grading plan shall be included
in the final plans for the affected areas and be
subject to approval by the city Manager.
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All collected public water shall be discharged into a
natural creek and also into the nearest downstream
floodway as shown on the most recent revision of the
"FLOODWAY - Flood Boundary and Floodway Map" prepared
by the Federal Emergency Management Agency (FEMA).
The point of discharge shall coincide with the prior
existing natural outlet for that particular public
water so collected. All downstream drainage
facilities between the development and the point of
discharge must have or be improved to provide
sufficient capacity to carry public water. All such
downstream or other off-site improvements and
easements therefor shall be provided to the city of
Colleyville at no cost to the city. Said downstream
drainage improvements shall be subject to waiver
pursuant to the provisions of IIA 5 hereof. Further,
in lieu of the aforesaid downstream drainage
improvements, said public water may be detained in an
approved detention facility in such a manner as to
not alter the natural drainage characteristics of the
property.
10. pipe stubouts may be allowed. When allowed,
pipe stubouts shall be designed with proper inlet
facilities to serve the entire design subarea. The
stubout pipe shall be extended to a point determined
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B.
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necessary to provide drainage facilities to all lots
within the subarea. 100 year overflows originating
from stubout pipes into public rights-of-way or
easements shall be limited to an amount which will
not exceed the right-of-way or easement capacity as
required in Sections lIB and IIC. Overflow
velocities shall be limited to velocities where no
erosion or detrimental impact occurs to public
facilities as determined by the city Manager.
Stubout design subareas must be graded in a manner
which is in conformance with the design and shall be
shown as part of the construction plans.
11. In order to provide protection from flooding, a
minimum of one (1) foot of freeboard above the water
surface resulting from a storm whose design frequency
is 100 years shall be provided to the lowest enclosed
floor elevation of all buildings intended for human
habitation.
12. When drainage runoff which originates on a lot
crosses more than one additional lot prior to
entering a dedicated street right-of-way or drainage
easement, drainage facilities shall be designed and
constructed and drainage easements dedicated to
accommodate the runoff from a storm whose design
frequency is 100 years.
13. The minimum elevation for streets or alleys crossing
or adjacent to an open drainageway or channel
including natural creeks, etc., shall be above the
water elevation of a design storm whose frequency is
100 years.
Storm Drain Facilities in Street Rights-of-Way
Streets and storm drains within new developments shall be
designed so that storm water runoff resulting from a
design storm of 100 year frequency is contained within the
available right-of-way and/or drainage easement. The
capacity of the street and right-of-way and/or easement
and the storm sewer pipe working in combination must be
designed for a capacity to safely contain a storm water
from a design storm of 100 year frequency.
Storm drainage facilities in existing developed areas
shall be designed to meet the criteria of the Storm
Drainaqe criteria and Desiqn Manual to the extent
practical as determined by the city Manager.
The storm sewer system is to begin at the point where the
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storm water from a 5 year frequency storm reaches curb
depth, with the exception of collector streets on which
storm sewer facilities must be designed to prevent one 12'
wide lane from ponding and on arterial streets on which
storm sewer facilities must be designed to prevent one 12'
wide lane in each direction from ponding. On future six-
lane divided roadways where four lanes will be constructed
initially, one 10' wide lane in each direction shall
remain dry unless waived by the city Manager.
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1. storm sewers are to be designed to provide:
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Capacity for the 5 year frequency storm runoff
when combined with the surface flow capacity of
the street (flow contained with the curbs or
providing for clear lanes as previously
described) and
Capacity for the 100 year frequency storm runoff
when combined with the surface flow capacity of
the available right-of-way.
At such point where the combined capacity of the
street and storm drain system satisfies the 5 year
street capacity criteria (as previously described)
but the 100 year frequency storm runoff can not be
contained within the right-of-way additional pick-up
points (inlet capacity) shall be provided along with
an increase in storm sewer capacity so that the 100
year frequency storm runoff will be contained within
the right-of-way.
a.
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b.
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2.
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In sump conditions, the 100 year frequency storm
capacity shall be provided for. The depth of ponding
shall not exceed one (I) foot measured from the
normal gutter line and shall be contained within the
right-of-way and/or easement.
3.
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4.
At such point within a storm drain system that the
100 year frequency storm runoff requires the
installation of a pipe greater than an eighty-four
inch (84") diameter storm drain (or some other shape
with a cross sectional area of more than 38.5 square
feet), to satisfy the above mentioned criteria, then
storm drainage facilities shall be installed in
accordance with section III, Open Channels.
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C.
storm Drainage Facilities in Easements or Separate
Drainage Rights-of-Way
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1. One and Two -- Family Residential Areas.
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When the 100 year storm can be contained in a
60" pipe or less; the 100 year storm must be
carried underqround.
a.
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b.
When the 100 year storm cannot be contained in a
60" pipe, the Developer may:
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(1) Put the 100 year storm underground, or
(2) Carry the 100 year storm in a lined or
unlined channel, or
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(3) Carry the 100 year storm in a natural creek
if the watershed is greater than one (1)
square mile (640 acres).
Sufficient pick-up points (inlet capacity) shall
be provided to properly load the system.
All Other Land Uses
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c.
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2.
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a.
When the 5 year storm can be contained in a 60"
pipe or less, the 5 year storm must be carried
underground and the rest of the waters from a
100 year storm must be carried underground
and/or in a drainage swale.
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b.
When the 5 year storm cannot be contained in a
60" pipe, the Developer may:
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(1) Put the 100 year storm underground, or
(2) Put the 100 year storm in a lined or an
unlined channel or natural creek, or
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(3) Put the 100 year storm in any combination
of underground, drainage swale, or channel
system.
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3.
For 100 year storm runoffs less than 10 cubic
feet per second, the 100 year storm may be
carried in a reinforced concrete flume.
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D.
Culverts and Bridges -
Culverts and bridges shall be designed for a design storm
frequency of 100 years. Bridges shall require two-foot
freeboard between the low point of the bridge and the 100
year water surface elevation. Where the drainage facility
crossing a street is an open channel or a natural creek, a
culvert or a bridge, as determined by the City Manager to
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be the most desirable, shall be constructed.
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Where a culvert is determined to be the most effective
option the headwater (hydraulic gradient) shall be a
minimum of one (1) foot below the adjacent top of curb.
Backwater zones shall be dedicated as floodplain
easements.
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E.
Lakes -
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Approval to develop in any area subject to inundation by a
lake must be obtained from the appropriate agency
responsible for that particular lake before the city
grants its approval. Agencies that should be contacted
include the U.S. Army Corps of Engineers, Tarrant County
Water Control Board, Texas Water Commission and the
Trinity River Authority.
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Regardless of approvals obtained from those agencies
listed above, no filling, development or construction in
any area subject to inundation by a lake shall occur
without the approval of the City Manager, and the City
Manager may require any studies necessary to determine
that filling, development or construction does not have
any detrimental effect on adjacent, upstream or downstream
properties and any building shall be protected. This
section in no way diminishes from other requirements of
this Policy.
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III. OPEN CHANNELS
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Alignment of open channels adjacent to public street
rights-of-way is to be discouraged and shall not be
allowed unless specifically approved in writing by the
City Manager. Open channels of any type shall not be
allowed in the median area or any divided thorouqhfare.
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Open channels shall meet the following criteria and be
designed in accordance with one of the following methods:
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A. Natural Creeks -
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Natural creeks may be approved without significant
channel improvements provided that:
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1.
Storm flow velocities do not exceed six (6) feet
per second unless the developer's geotechnical
engineer can show that the soils will sustain
higher velocities without erosion. The
engineer's findings (appropriately documented
and sealed) less one (1) foot per second shall
be maximum water velocity allowed so as to avoid
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erosion that could threaten life or property.
All side slopes that are exhibiting erosion
shall be regraded to a 4 to 1 ratio and seeded,
or as approved by the city Manager. Roughness
coefficients ("n") for natural creeks shall
adhere to criteria presented in the city of Fort
Worth storm Drainaqe criteria and desiqn Manual.
2.
The appropriate use of the neighboring property
or the health and safety of such persons
affected will not be substantially injured; and
3.
If any entity other than the City maintains the
natural creek, that entity shall enter into an
agreement by which the City is indemnified from
loss of life or property damage resulting from
erosion of the creek bed and bank or any other
cause.
In addition, such creeks may be modified by cutting
and filling in accordance with FEMA requirements
provided that:
1.
Fill material must be suitable for compaction to
create side slopes capable of sustaining
expected flow velocities without erosion.
2.
Resulting side slopes shall not be steeper than
a 4 to 1 ratio unless the developer's
geotechnical engineer can show that the soils
will sustain steeper slopes without erosion; and
Ample soil compaction testing shall be required
to insure that 95 percent of standard Proctor
density is achieved.
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B. Improved Earthen Channels
1.
storm flow velocities shall not exceed six (6)
feet per second unless the developer's
geotechnical engineer can show that the soils
will sustain higher velocities without erosion.
The engineer's findings (appropriately
documented and sealed) less one (1) foot per
second shall be the maximum water velocity
allowed so as to avoid erosion that could
threaten life or property. Roughness
coefficients ("n") for improved earthen channels
shall adhere to criteria presented in the city
of Fort Worth storm Drainaqe criteria and Desiqn
Manual. The minimum roughness coefficient ("N")
for improved earthen channels to be maintained
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C.
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5.
by the City shall be 0.050;
2.
The channel shall have a trapezoidal shape with
side slopes not steeper than a 4 to 1 ratio
unless the developer's geotechnical engineer can
show that the soils will sustain steeper slopes
without erosion;
3.
The channel bottom must be at least 12 feet in
width;
4.
One foot of freeboard above the 100 year
frequency water surface elevation must be
available within the designed channel at all
locations; and
5.
The appropriate use of the neighboring property
or the health and safety of such persons
affected will not be substantially injured.
Lined Channels -
1.
Channels shall be trapezoidal in shape and lined
with reinforced concrete in accordance with City
standards and Specifications with side slopes of
no steeper than two (2) foot horizontal to one
(1) foot vertical or otherwise to such
standards, shape and type of lining as may be
approved by the City Manager. The lining shall
extend to and include the water surface
elevation of the 100 year design storm plus one
foot freeboard above the 100 year water surface
elevation;
2.
The channel bottom must be a minimum of 8' in
width;
3.
The maximum water flow velocity in a lined
channel shall be twenty (20) feet per second
except that the water flow shall not be
supercritical in an area from 100' upstream from
a bridge to 25' downstream from a bridge.
Hydraulic jumps shall not be allowed from the
face of a culvert to 50' upstream from that
culvert;
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Whenever flow changes from supercritical to
subcritical channel protection shall be provided
to protect from the hydraulic jump that is
anticipated;
The design of the channel lining shall take into
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account the superelevation of the water surface
around curves and other changes in direction.
6.
A chain link fence six (6) feet in height or
other improvements as approved on a case be case
basis by the City Manager shall be constructed
on each side of the concrete channel lining; and
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7.
Gabion or other forms of channel lining may be
allowed in lieu of reinforced concrete lining
with the approval of the City Manager.
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IV. DETENTION PONDS
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On-site detention is the process of storing or retaining
storm water runoff and regulating its outflow in order to
distribute the runoff over a longer period of time.
An on-site detention system may be allowed. The provision
of either an adequate outfall condition or an on-site
detention system shall be subject to the approval of the
City Manager. For parking lots used as detention ponds,
the maximum depth of ponding allowed shall not exceed one
(1) foot, and a maintenance indemnity/agreement may be
required.
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V.
EASEMENT REQUIREMENTS
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Storm Sewer Pipe -
A.
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Minimum easement requirements for storm sewer pipe
shall be as follows:
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Pipe Size
Minimum Easement
width Required
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36" and under
42" through 54"
60" through 66"
72" through 102"
over 102"
15 feet
20 feet
25 feet
30 feet
3.5 times pipe
diameter
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Notes:
1)
The outside face of the proposed storm
drain line shall be placed five (5)
feet off either edge of the storm
drain easement. The proposed
centerline of overflow swales shall
normally coincide with the centerline
of the easement.
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2)
On pipe sizes not exceeding 54" a
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m1n1mum of five (5) additional feet
shall be dedicated when shared with
utilities.
3)
Box culverts shall have an easement
width equal to the width of the box
plus twenty (20) additional feet. The
edge of the box should be located five
(5) feet from either edge of the
easement.
4)
Drainage easements will generally
extend at least twenty-five (25) feet
past an outfall headwall to provide an
area for maintenance operations.
Drainage easements along a required
outfall channel or ditch shall be
provided until the flowline
"daylights" on natural grade. The
minimum grade allowed on an outfall
channel or ditch will be 0.2 foot per
100 feet.
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B. Open Channels -
1.
Natural creeks shall have a dedicated floodplain
easement and shall include an additional ten
(10) feet adjacent to the water surface
elevation of a 100 year frequency storm. The
minimum finished floor elevation for lots
impacted by natural creeks shall be a minimum of
two (2) feet above the 100 year water surface
elevation.
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No construction shall be allowed within a
floodplain easement without the written approval
(development permit) of the City, and then only
after detailed engineering plans and studies,
sealed and signed by a professional Engineer
registered in the state of Texas show that no
flooding will result, and that no obstruction to
the natural flow of water will result.
2.
Improved Earthen Channels shall have dedicated
drainage easements of five (5) feet width on
each side of the designed channel to protect
against erosion.
3 .
Concrete Lined Channels and Gabion Lined
Channels shall have drainage easements dedicated
to meet the requirements of the width of the
channel, the one-foot freeboard, and the fence;
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C. Detention Ponds -
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D.
Easements for detention ponds shall be negotiated
between the City and the Property Owner.
Access Points -
The entire reach or each section of any drainage
facility must be readily accessible to maintenance
equipment. Additional easement(s) shall be required
at the access point(s) and the access points shall be
appropriately designed to restrict access by the
public (including motorcycles). At a minimum, one
access point will be required at every intersection
with a city street right-of-way.
Temporary Drainage Easements -
Temporary drainage easements may be accepted for
drainage outfall conditions upon the developer
obtaining written approval from the City Manager.
VI. ENGINEERING AND SUBMISSION OF DRAINAGE STUDIES AND/OR
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E.
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A.
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B.
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certification -
All Drainage Studies and/or Plans including those
which are part of a standard construction plan
submittal shall be sealed and signed by an engineer
proficient in civil engineering and registered in the
State of Texas. All drainage submittals shall
include the following certifying statement by the
"Engineer of Record":
"I,
a professional engineer, registered in the State of
Texas, have prepared this Drainage study and/or Plan
in compliance with the latest published Policy,
criteria and requirements of the City of Colleyville,
have verified that the topographic information used
in this Study and/or Plan is in compliance with said
requirements and is otherwise suitable for developing
this workable overall Plan of Drainage which can be
implemented through proper detailed construction
planning and subsequent construction."
Specification of Submittals -
Drainage Studies and/or Plans shall include a
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topographic map of the applicable watershed and all
necessary data and calculations including the plan
and profile of all proposed drainage facilities.
Sheets shall be either 22" x 36" or 24" x 36 in size
and may contain sheet to sheet match lines. The
originals shall be prepared using permanent ink on
film and one reproducible film copy shall be
furnished to the City upon final acceptance of the
Study and/or Plans.
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The topographic map shall have a scale not smaller
than 1" = 200' with a contour line interval of 2 feet
for all drainage areas and sub-areas having an area
of less than 1 square mile (640 acres). For drainage
areas and sub-areas greater than 1 square mile the
scale shall not be smaller than 1" = 2000' with a
contour interval of 10 feet.
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Tables presenting hydrologic and hydraulic data and
calculations shall be presented in the Study and/or
Plans and shall include at least the following:
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1.
Hydrology - Design Point identification,
incremental and total drainage area, runoff
coefficient, incremental and total time of
concentration, 5-year and 100-year frequency
rainfall intensities and peak discharges.
detailed unit hydrograph data must also be
included if applicable.
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Hydraulics - Design discharge, capacity, carry-
over and hydraulic gradient data for all inlets,
sewers, streets, culverts, channels, natural
creeks and combined systems (i.e.:
sewer/street). Plan and profile sheets shall
have a scale of 1" = 40' horizontal and 1" = 4'
vertical. The 5-year and 100-year frequency
hydraulic gradients shall be shown for all
drainage facilities. Complete Corps of
Engineers HEC-2 computer program data shall be
furnished for all natural creeks and irregularly
shaped drainage facilities.
2.
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VII. WARNING AND DISCLAIMER OF LIABILITY
The degree of flood protection required by this Policy 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 Policy does not imply that land outside the areas of
street right-of-way, drainage or flood plain easements
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o -i I-~ ~ ~
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will be free from flooding or flood damages. This Policy
shall not create liability on the part of the City of
Colleyville, Texas or any official or employee thereof for
any flood damages that result from reliance on this Policy
or any administrative decision lawfully made thereunder.
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Sec. 2:
Any person, firm or corporation violating any of the
provisions of this ordinance shall be guilty of a
misdemeanor and upon conviction thereof shall be
fined in a sum not to exceed Five Hundred Dollars
($500.00). Each and every day such violation
continues shall constitute a separate offense and
shall be punishable as such.
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Sec. 3:
The City secretary is hereby authorized and directed
to cause publication of the descriptive caption and
penalty clause hereof as an alternative method of
publication provided by law.
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AND IT IS SO ORDERED.
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The fi~st readin~nd publi~.hearing being conducted on the
~ /Pi day of ~rA'i:~ , 1987.
The s~~ond reading public hearing being conducted on the
'1iM day of , 1988.
The th~rd reading a being conducted on the
18-A, day of ,1989.
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ATTEST:
~ko~
CITY OF COLLEYVILLE
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city Secretary
J. R. Hubbard
Mayor
Section 3.14 of City Charter: If the Mayor shall
neglect to approve or object to any such proce dings
for a longer period that seven (7) days after
ordinance or resolution is placed in the fficE
of the City Secretary as aforesaid. the same shall
become effective immediately upon publicat on a5
required by law.
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APPROVED AS TO FORM & LEGALITY:
......../ ....j ,1
'" ._~. i
~-.) I FL::;t:=.-...
Ross T. Foster
City Attorney
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Efective: January 26. 1988
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