HomeMy WebLinkAboutResolution 2000-030
RESOLUTION NO. 2000-30
BE IT RESOLVED BY THE CITY COUNCIL OF THE CITY OF NORTH
RICHLAND HILLS, TEXAS, that:
WHEREAS, Resolution No. 95-11 adopts the Public Works Design Manual of the
City of North Richland Hills, Texas; and
WHEREAS, the current Design Manual regulation dealing with Open Earthen
Channels does not provide for the use of soil retention blankets; and
WHEREAS, it is in the best interest of the City that soil retention blankets be
used.
NOW, THEREFORE, be it resolved by the City Council of the City of North
Richland Hills, Texas, that:
1.
Paragraph 10., c., 7, of Subsection B of Section 1-05 of the said Public Works
Design Manual shall hereafter read as:
"7. That, 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.
Earthen channels, when approved, shall be constructed with a
trapezoidal shape and a minimum bottom width of twelve (12') feet and
side slopes not steeper than four (4') feet horizontal to one (1') foot
vertical (5 to 1 preferred). A reinforced concrete pilot channel not less
than twelve (12') feet in width shall be constructed. The side slopes shall
be smooth, free of rocks, and contain a minimum of six (6") inches of top
soil. Gobi blocks, rock rubble riprap, or other such similar materials, shall
be placed a minimum of four (4') feet along both sides of the pilot channel
to a depth of at least two (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 an earthen channel shall extend at
least twenty (20') feet beyond the top of each channel bank and shall not
be cross-fenced. The top of bank areas shall remain open for
maintenance purposes.
After proposed earthen side slopes are cut, slopes shall receive the six
(6") inches of topsoil, hydro mulch, and a soil retention blanket. The
furnishing and placing of topsoil shall conform to the Texas Department of
Transportation (TxDOT) Specification Item 160. The furnishing and
placing of hydro mulch shall meet the requirements of the North Central
Texas Council of Government's (NCTCOG) Standard Specifications for
Public Works Construction, Items 2.15.2 "Fertilizer", 2,15.3 "Hydro Mulch
Materials", and 3.10.7 "Hydro Mulching". The soil retention blanket will be
American Excelsior Hi-Velocity Curlex or equal as approved by the Public
Works Director, The soil retention blanket will be furnished and placed in
accordance with the manufacturer's recommendation. In no instance shall
the placement method per the manufacturer's recommendations be less
than that required in TxDOT Specification Item 169.
The water surface profile (hydraulic grade line) for the one hundred (100)
year frequency storm shall be shown. Maximum permissible mean
velocities for the one hundred (100) year frequency discharge shall be
eight (8) feet per second in partially concrete lined channels while in fully
concrete lined channels, the maximum permissible mean velocities for one
hundred (100) year frequency discharge shall be fifteen (15) feet per
second.
Special consideration should be given to outlet structures on channels
where concrete lining meets earthen banks.
One reinforced concrete access ramp shall be provided at all intersections
of every open channel with a public street. Access ramps shall be a
minimum of twelve (12') feet wide with a maximum slope of sixteen (16%)
percent."
2.
This amendment shall be in full force and effect upon its date of passage.
PASSED AND APPROVED this the 8th day of May, 2000.
Approved:
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Charles Scomaf Mayor
ATTEST:
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Patricia Hutson, City Secretary
APPROVED AS TO FORM AND LEGALITY:
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Rex McEntire, t orney for the City
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APPROVED AS TO CONTENT: