HomeMy WebLinkAboutOrdinance 1207
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ORDINANCE NO. 1207
WHEREAS, Ordinance 195 (Sub-Division Ordinance) is inadequate, in
its present form, to protect the health and public welfare of the City and its
inhabitants; and
The City Council has ascertained that the below listed changes and
amendments are necessary in order to protect the health, safety and general
welfare of the City and its inhabitants.
NOW THEREFORE, BE IT ORDAINED by the City Council of the City of
North Richland Hills, Texas, that:
1.
Subsection "B" "I" of Section 2-06 of Ordinance No. 195 is amended
to read as follows:
"B. DESIGN OF FACILITIES
1. Street and underground storm drains shall be designed to
accommodate a five-year frequency storm with adequate overland
relief for the 25-year storm. Design of all bridges, culverts,
underpasses, and open channels are to be based of the 100 year
frequency. Overland relief for the 25-year frequency storm
shall be fully contained within the street right-of-way.
Overland relief for the 100-year storm may be provided in the
street right-of-way plus the yard area adjacent to the street
right-of-way, and the lowest adjacent building finished floor
elevation shall be at least 1.5 feet above the 100-year street
overland relief flow elevation.
Where storm drains are located outside dedicated street right-
of-way in dedication easements, overland relief for the 100-year
storm shall be provided within the drainage easement, and the
lowest adjacent building finished floor elevation shall be at
least 1.5 feet above the 100-year overland relief flow
elevation."
2.
Subsection "B" "7" of Section 2-06 of Ordinance 195 is amended to read as
follows:
"B DESIGN OF FACILITIES
.............
7. Water in excess of that permissible in streets with allowable
depth or spread of water shall be carried in storm sewers or
open ditches not in street right-of-way. Capacity of storm
sewers and ditches shall be calculated by Manning's Formula as
illustrated by the following chart. In cases where 60-inch or
smaller pipe will handle the design flow, pipe shall be used.
In cases where a 60-inch pipe is not adequate, the developer may
Page two
ORDINANCE NO. 1207
use pipe or a lined open drainage channel. Such drainage ditch
shall be completely concrete lined and sized using fully
urbanized 100-year frequency criteria.
If headroom above the calculated pipe size is not available then
hydraulically equivalent elliptical or arch pipe, or not more
than 3 parallel pipes may be substituted for the single circular
pipe. In the design of the street storm drain system, the
elevation of the hydraulic gradient of the storm sewer shall be
a minimum of 1.5 feet below the elevation of the adjacent street
gutter. In any system, the junction of pipes of different
diameter shall be made at inlets, junction boxes or manholes so
that the crowns of the pipes are at the same elevation.
The Developer shall be required to install at his own expense
all storm sewers and drainage structures. This policy is
applicable to all drainage facilities including the main
channels and tributaries of Mackey, Calloway, Walker, Little
Bear and Mesquite Branch Creeks, but excepting Big Fossil Creek.
The Developer shall be responsible for excavation and full
concrete channel liner improvements based on the fully urbanized
100-year frequency discharge for the channel, unless otherwise
approved by the City Council.
EARTHEN CHANNELS (ONLY IF APPROVED BY CITY COUNCIL): Earth
channels may be approved provided that the velocity of flow will
not produce serious erosion; that sufficient easements are
dedicated to provide protection of adjacent properties or
facilities; that floodway easements are dedicated to encompass
the area below the elevation of the water surface profile of a
fully urbanized 100-year frequency storm, plus one foot of
freeboard and any additional area necessary to provide access
and maintenance, but not less than 60 feet in width; where
arrangements have been made for perpetual maintenance by the
adjacent property owners, and/or has been dedicated and accepted
for City Park purposes; and where, in the judgement of the
Public Works Director, the appropriate use of the neighboring
property or the health and safety of persons affected will not
be substantially injured.
Earth channels, when approved, shall be constructed with a
trapezoidal shape and a minimum bottom width of 12 feet and side
slopes no steeper than 3 feet horizontal to 1 foot vertical (4
to 1 preferred). A reinforced concrete pilot channel not less
than 12-feet in width or, as determined by the Public Works
Director, shall be constructed. The side slopes shall be
smooth, free of rocks, and contain a minimum of 6-inches of top
soil, and shall be seeded with Bermuda grass. Gobi blocks, rock
rubble riprap, or other such similar materials, shall be placed
a minimum of 4-feet along both sides of the pilot channel to a
depth of at least 2 feet. Size and gradation of such material
shall be determined based,on peak discharge velocity
requirements. The pilot channel shall be constructed as
approved by the Public Works Department. The easement width for
earthen channels shall extend at least 20-feet beyond the top of
each channel bank."
Page 3
ORDINANCE NO. 1207
3.
Subsection "B" "8" of Section 2-06 of Ordinance No. 195 is amended to
read as follows:
"B. DESIGN OF FACILITIES
.............
8. Storm sewers are to be designed for a storm frequency of 5
years, (See Figure 2); however, the total capacity of the
drainage facility including surface flow within limits of
available street, front yard, right-of-way or drainage easements
shall be equal to or greater than the runoff of a storm whose
fully urbanized design frequency is 100 years.
At such point within a storm sewer system that the capacity of
the storm sewer designed for a storm frequency of 5 years, in
addition to the surface flow capacity within available right-
of-way or easements, is exceeded by the runoff from a storm
whose fully urbanized design frequency is 100 years, then the
storm sewer shall be increased in size and designed for a
capacity of a higher return year, of 10, 25, 50, or 75 years, so
that the right-of-way or easement section and the storm sewer
has the combined capacity to provide for the runoff of a storm
whose design frequency is 100 years.
At such point within a storm sewer system that the capacity of
the storm sewer designed for a storm frequency of 75 years, in
addition to the surface flow capacity within available right-of-
way or easements, is exceeded by the runoff from a storm whose
design frequency is 100 years, or the required pipe size exceeds
60-inches in diameter, then storm drainage facilities shall be
designed as an underground storm drain with fully urbanized
100-year capacity or designed as a completely concrete lined
open channel with fully urbanized 100-year discharge capacity."
4.
Subsection "B" "14" of Section 2-06 of Ordinance No. 195 is amended to
read as follows:
"B. DESIGN OF FACILITIES
.............
14. All open ditches in all subdivisions that are used to carry
surface runoff across more than two lots shall be fully concrete
lined across the entire areas of each subdivision being
developed, except as otherwise determined by the City Council.
Lining of drainage ditch floors is to be done with 6-inch thick
or thicker, Class "A" 3,000 psi Portland Cement concrete. Walls
are to be lined with 5-inch thick concrete sloped not steeper
than 1 foot vertically to 1 foot horizontally. All concrete
slabs are to be reinforced with a minimum of #3 reinforcing
steel bars placed at most 18-inches on center each way, and
provided with minimum 2-inch diameter weep holes with approved
Page 4
ORDINANCE NO. 1207
filter media placed at intervals no greater than 25-feet
centers. One (1) foot wide concrete wings shall be provided at
the top of each concrete side slope and pvc sleeves formed in
the wings as required for constructing fencing along the top of
the channel on each side. Vertical concrete retaining wall
sections shall be designed with adequate footing and reinforcing
steel to support all anticipated soil and water pressure loads
acting on each side of the structure. In addition, retaining
walls shall be designed to support at least a Highway Surcharge
load unless otherwise approved by the Public Works Department.
FULL CHANNEL LINER (See Figure 1): The height of concrete
channel liner shall be at least 1 foot above the fully unbanized
100-year water surface profile. Such profile shall be
determined by backwater calculations using the HEC-2 computer
program or other approved modeling methods which take into
account backwater effects from downstream bridges, culverts, and
other obstructions. Sizing based only on normal depth
calculations will not be approved unless it can be demonstrated
that such downstream backwater effects can be safely ignored, or
future downstream improvements are being made which will lower
the controlling downstream elevation below normal depth as
determined using the Mannings Equation.
In cases where the top of channel liner must be constructed
above natural ground level as required to fully contain the
100-year flow, and where construction of levees or berms are
permitted, provision shall be made for draining the local runoff
which ponds behind the levees after the water surface in the
channel recedes. Finished floor elevations may be established
at least 1.5 feet above the peak 100-year water surface which
ponds behind the levees, if approved by the Public Works
Department.
If levees are not approved by the Public Works Department then
compacted earthen fill shall be placed along side the channel
within the entire flood plain area as required to concrete line
the channel to a height of 1 foot above the fully urbanized
100-year water surface elevation. Side slopes of the channel
banks behind the concrete channel liner shall be no steeper than
5 foot horizontal to 1 foot vertical within the drainage channel
easement, or for a distance of not less than 20-feet behind the
top of channel. Side slopes beyond the 20-foot minimum shall be
no steeper than 3 foot horizontal to 1 foot vertical unless
concrete lined or covered with approved soil erosion protection
materials. The easement width for earthen channels shall extend
at least 20-feet beyond the top of each channel bank.
PARTIAL LINER: If the 100-year fully channel contained water
surface is above the natural ground line and levees are not
approved or flood plain fill is not feasible, then the concrete
channel liner shall be extended to the natural ground line along
each side of the channel. In no case shall the concrete lined
channel capacity provided by less than that required to convey
the 25-year frequency discharge. Floodway easements shall be
Page 5
ORDINANCE NO. 1207
provided along the sides of the concrete lined channel
sufficient to encompass all areas beneath the water surface
elevation resulting from a fully urbanized 100-year discharge,
plus such additional width easements as may be required to
provide ingress and egress to allow maintenance and to protect
adjacent property against erosion, caving-in of over-banks,
etc., as determined and required by the Public Works Department.
The Developer shall be responsible for furnishing complete
cross-sections, grading plans, HEC-2 computer runs and all other
documentation requested by the Public Works Department as
required to justify less than full section concrete channel
lining and to establish the limits of the 100-year overflow
flood plain lines. Water surface profile calculations shall be
based on backwater effects created by an existing bridge,
culvert or other obstruction regardless of future downstream
proposed improvements."
5.
Subsection "B" "15" of Section 2-06 of Ordinance No. 195 is amended to
read as follows:
"B. DESIGN OF FACILITIES
.............
15. In new subdivisions the developer shall provide all the
necessary easement and right-of-way required for drainage
structures, including storm sewers and open lined channels.
Easement width for storm sewer pipe shall not be less than 10
feet, and easement width for open channels shall be at least 40
feet wider than the top of the channel, 20 feet of which shall
be on each side to serve as access ways for maintenance
purposes.
Concrete channel access ramps and access easements shall be
provided at all street crossing for Public Works maintenance
vehicle access to the channel bottom. Access ramps shall be
a minimum 12 feet wide with a maximum slope of 16-percent.
If fencing is required, it shall be placed along the top of the
concrete channel liner unless a sanitary sewer main or water
line is located within an easement along the channel bank, in
which case the fence shall be located on the easement line to
permit unrestricted Public Works access to the utility line."
6.
There is hereby added to Ordinance 195 a subsection "B" "19" to Section
2-06 which shall read as follows:
Page 6
ORDINANCE NO. 1207
"B. DESIGN OF FACILITIES
.............
19. If drainage swales or flumes are constructed within a
subdivision to discharge local surface runoff to a street or
storm drain system, such swale or flume shall not be permitted
to cross more than two (2) lots without dedication of a drainage
easement. Fences shall not be constructed across any drainage
easement which would obstruct flow."
7.
The rema~n~ng portions of Ordinance No. 195, as amended by ordinances
prior hereto are hereby ratified affirmed and approved.
8.
Ordinance No. 195, as heretofore amended, and this ordinance shall
constitute the subdivision rules and regulations for this City.
9.
This ordinance shall be in full force and effect from and after its date of
passage and approval.
1985.
PASSED AND APPROVED this 8th day of APril
~&~
Mayor
ATTEST:
I 2 -? /J .
"- /ccc¿='z:¿¿ µ¿¿<¿'fV
c~secretary
APPROVED AS TO FORM AND LEGALITY:
Rex McEntire, Attorney
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EXISTING l00-YEAR FLOOD PLAIN
..
EX I STI NG CHANNEL
SECTION BEFORE
IMPROVEMENTS
MINIMUM EASEMENT WIDTH IF ACCESS RAMP
TO CHANNEL BOTTOM IS PROVIDED
(INCREASE EASEMENT ijO-FEET IF RAMP
NOT PROVIDED)
_ IMPROVED l00-YEAR FLOOD PLAIN. EXISTING lOO-YEAR
~~~_______~___~~IT~um~__
~ 1, I FT.· --FENCE ~ HOUSE
, 1. 6 MIN. --1-:...L F
... ~ .F.
----~--- t l7ð//'-
IMPROVED l00-YEA -, IIJ(ilJ/~
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~ 1.6'MIN.
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LEVEE
EXCA-VATION"-PROPOSED CONCRETE
CHANNEL II NER
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BEHIND
LEVEE
( tOO-YEAR)
FULL IOO-YEAR C.oNCRETE CHANNEL LINER
I MPROVED 100- YEAR FLOOD PLA I N
(ADD ~FEET FOR EA~EMENT WIDTH)
EXISTING 100-YEAR {IMPROVED l00-YEAR /"OUSE
WATER SURFACE" WATER SURFACE ~
--t--~_'L- -------t--I~--
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----~ FILL'
EXISTING CHANNEL
SECTI ON BEFORE
IMPROVEMENTS
PROPOSED CONCRETE CHANNEL
liNER (EXTEND LINER TO
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CAPACITY REQUIRED)
PARTIAL IOO-YEAR CONCRETE CHANNEL LINER
,¿,
I'I/~~
PROPOSED
EARTHEN CHANNEL
EXISTING
NATURAL
GROUND
EARTHEN CHANNEL WITH CONCRETE PILOT
IFIGURE 1
BUILDING SETBACK WIDTH I
1_ r
I IMPROVED IOO-YEAR FLOOD PLAIN (MAX. SPREAD) I
I · I
I I STREET RIGHT-OF-WAY I I HOUSE
I I I I
I 25-YEAR FLOOD PLAIN (MAX. SPREAD) - I LJ
~rum ~~/ ______-L-__ --~ 1"'-
GROUND -::----------Sl--J{
8T .~ 1.5' MIN.
~~Ë~E~~RFACE ¡'J::'" -. STREET PAVE~NTJ :. "~'.:
25-YEAR WATER SURFACE
CURB & GUTTER
MINIMUM 5-YEAR DESIGN
OVERSIZE AS REQUIRED________
(10, 25, 50, 15-YEAR) TO
MAINTAIN 25 AND IOO-YEAR
SPRE~D LIMITS SHOWN ABOVE
UNDERGROUND STORM DRAIN CONDUIT
STORM DRAIN IN STREET
1.5' ~'N.
11.5' MIN.
\...OVERLA~ELIE:::: -L;j
lOO-YEAR WATER SURFACE \
I
I
I
I
I
I
I
IMPROVED lOO-YEAR FLOOD PLAIN LIMITS .
PE~NENT DRAINAGE EASEMENT
.
25-YEAR WATER SURFACE
1I'OT_ MAJ" WATERCOURSE)
~ ¡h;lll"'.
STREET
F.F. I
-'"
OVERLAND RElI EF
SWALE -- liNE WITH
CONCRETE OR OTHER
MATERIAL APPROVED
BY PUBLIC WORKS DEPT.
OVERSIZE AS REQUIRED-
(10, 25, SO, 15-YEAR) TO
MA INTA IN lOO-YEAR FLOOD
PLAIN LIMITS WITHIN EASEMENT
(MAY REPLACE PIPE WITH CONCRETE
CHANNEL IF GREATER THAN OR EQUAL
TO 60-INCH DIA.)
UNDERGROUND STORM DRAIN CONDUIT
STORM DRAIN IN EASEMENT
FIGURE 2