HomeMy WebLinkAboutRES 03.18.1980 - Flood PlainEZ
A RESOLUTION ESTABLISHING MINIMUM
CRITERIA FOR A DEVELOPMENT PERMIT
UNDER -THE -FLOOD PLAIN MANAGEMENT
ORDINANCE OF THE CITY OF GEORGETOWN,
TEXAS.
WHEREAS, the City of Georgetown adopted an ordinance establishing minimum
flood plain management rules and regulations on the 23rd day of May, 1977, here-
in referred to as the Flood Plain Management Ordinance, and
WHEREAS, there is a concern on the part of the City of Georgetown that
storm water be moved naturally and without creating additional flood hazards
for any property owner, and
WHEREAS, there is a need for additional flood plain development clarification
and criteria, Now therefore,
BE IT RESOLVED BY THE CITY COUNCIL OF THE CITY OF GEORGETOWN, TEXAS:
The City Council hereby adopts the attached engineering criteria
as administrative guidelines to be applied to any development in
areas designated as flood hazard areas. These shall be the min-
imum standards required for a development permit required by
the Flood Plain Management Ordinance.
PASSED AND APPROVED this day of 1980.
J in C. Doerfler, Mayor
ATTEST:
W. L. WALDEN,
City Secretary
Minimum Criteria for Flood P ain
Development Permit
(1) Development or alteration of the flood plain shall result in
no increase in water surface elevation of the base flood of
the Creek.
(7) Whenever Feasible, the integrity of the natural channel will
be protected. As required, the elevation of excavated areas
in the flood plain shall not be lower than one-third of the depth
of the natural channel as measured from the adjacent bank or
the one (1) year frequency flood, whichever is lower, except
for the excavation of lakes. No excavation shall be closer
than 50 feet from the bank of the natural channel except as
necessary to drain.
(8) A landscape plan shall be required, and shall include plans
for erosion control of cut and fill slopes, restoration of ex-
cavated areas and tree protection where possible in and below
fill area. Landscaping should incorporate natural materials
(earth, stone, or wood) on cut or fill slopes whenever possible.
(9) The effects of existing or proposed public al., ,private improve-
ments shall be used in determining water surface elevations
and velocities.
(10) Any alteration of the flood plain shall not cauoe any additional
expense in current or projected capital improvements.
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(2) Development or alteration of the flood plain shall not create
an erosive water velocity on or off the site. The mean
velocity of stream flow at the downstream end of the site
after development or alteration shall be no greater than the
mean velocity of the stream flow under existing conditions.
(3) Development or alteration of the flood plain shall be per-
mitted by equal conveyance on both sides of the natural
channel.
(4) Relocation or alteration of the natural channel shall not be
permitted without an environmental assessment, including
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a stream rehabilitation proposal.
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(5) The toe of any fill slope shall parallel the natural channel
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to prevent an unbalancing of stream flow in the altered
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flood plain.
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(6) To insure maximum accessibility to the flood plain for
maintenance and other purposes, and to lessen the probabil-
ity of slope erosion during periods of high water, maximum
slopes of filled area shall not exceed 3 to 1 for 50 percent
of the length of the fill and 6 to 1 for the remaining length of
the fill. The slope of any excavated area not in rock shall
not exceed 4 to 1. Vertical walls, terracing and other slope
treatments will be considered if no unbalancing of stream
flow results.
(7) Whenever Feasible, the integrity of the natural channel will
be protected. As required, the elevation of excavated areas
in the flood plain shall not be lower than one-third of the depth
of the natural channel as measured from the adjacent bank or
the one (1) year frequency flood, whichever is lower, except
for the excavation of lakes. No excavation shall be closer
than 50 feet from the bank of the natural channel except as
necessary to drain.
(8) A landscape plan shall be required, and shall include plans
for erosion control of cut and fill slopes, restoration of ex-
cavated areas and tree protection where possible in and below
fill area. Landscaping should incorporate natural materials
(earth, stone, or wood) on cut or fill slopes whenever possible.
(9) The effects of existing or proposed public al., ,private improve-
ments shall be used in determining water surface elevations
and velocities.
(10) Any alteration of the flood plain shall not cauoe any additional
expense in current or projected capital improvements.
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