HomeMy WebLinkAboutOrdinance 0793
ORDINANCE NO. 793
BE IT ORDAINED BY THE CITY COUNCIL OF NORTH RICHLAND HILLS, TEXAS,
that Ordinance No. 195 (Subdivision Ordinance) is hereby revised as follows:
Section 2-05A.
Introductory paragraph. The first sentence is changed to read as follows:
Storm water runoff for drainage basins up to 750
acres in size shall be computed by the rational
method which is---etc.
Last sentence (added). For drainage basins larger than 750 acres in
size, the synthetic unit hydrograph or other
approved method shall be used. Specific formulas
and graphs for constructing the unit hydrograph
are available from the City Engineer.
Section 2-05B.
Paragraph 1. The last sentence is changed to read as follows: Design of all
bridges, culverts, underpasses, and open channels are to be
þased on the 100 year frequency.
Paragraph 11. (Added) Concrete valley gutters will not normally be permitted
across any street classified as thoroughfare. If an exception
is jointly made by the City Engineer and Public Works Director,
the valley gutter will be a minimum of 10 ft. in width. Valley
gutters across collector streets will be discouraged except at
intersections with a thoroughfare. If permitted, they will be
at least 8 ft. in width.
Paragraph 17. (Added) Developers will insure that due care is exercised to
comply with the provisions of Texas Water Code, Sect. 11.086,
and this shall include having appropriate drainage studies and
plans prepared and sealed pursuant to the PROFESSIONAL ENGINEERS
DISCIPLINARY RULES DR1.1,2.2 and 3.1 and ETHICAL CONSIDERATIONS
EC 6.3 and 6.4. Water concentrated in streets, pipes, drains,
culverts, and channels will be moved to a recognized water course
without damage to intervening structures or undue spreading across
intervening land. The developer is responsible for constructing
any channelization required to accomplish this and also to obtain
any necessary easements from intervening land owners. Calculations
will be required to show that connecting offsite drainageways are
capable of handling any increase in runoff due to development,
concentration, or diversion for a least the 10 year storm frequency.
Paragraph 18. (Added) Developers of property downstream on a drainage basin
which is undeveloped, or only partially developed, will insure
that drainage facilities through their development are adequately
sized to handle runoff from higher lands when the higher lands
are fully developed. Runoff coefficients assumed for higher
undeveloped property will take due note of current zoning and the
most probable use of the property and these assumptions will be
clearly spelled out in development plans.
PASSED AND APPROVED this 14th day of January, 1980.
ATTEST:
APPROVED AS TO FORM AND LEGALITY:
/
,
Rex McEntire - City Attorney
/
lyf~/6WJ
DickVfaram - Mayor