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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. I -S (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 CO a stream rehabilitation proposal. CO (5) The toe of any fill slope shall parallel the natural channel d' to prevent an unbalancing of stream flow in the altered 0 flood plain. Q Q (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. 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