Board of Adjustment Agenda and Packet 2003 04 16

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3. "The fill or deposit of materials does not imprudently reduce the flood storage capacity of the waterway .... " 4. The fill or other materials will be protected against erosion by riprap .... " A detailed drawing of the bridge and bank repairs can be found in the application packet. The materials to be used in securing the bank are "riprap" (rock or crushed rocks) on top of sandstone and claystone bedrock base. Although the construction materials would increase the flow velocity and water elevation, it is at an acceptable level and the type of construction does comply with subsection A. previously reviewed. Again, the cumulative effect of any proposed development of abutments and rip -rap fill material, when combined with all other existing and anticipated development, shall not increase the water surface elevation of the base flood more than one foot at any point. STAFF RECOMMENDATION: While the City does not generally encourage development activity in any floodplain, this proposal is somewhat important to improve traffic flows throughout the city as well as the eastern county region. The design of the banks and bridge allows for an acceptable measure or clearance of water under the bridge. Where a one -foot interval of increased water is permitted, an increase of .6 feet of water would run under the bridge at a 100-year flood draining Coal Creek. Staff's findings are in support of the Floodplain Permit application at this time. The application provides sufficient information to Staff that the proposal would comply with the applicable items in Section 17.56.160 A-C. With that, Staff recommends approval of the Floodplain Development Permit under review to allow for the construction of a bridge spanning Coal Creek that includes two support piers; abutments at the end of the bridge span; two traffic lanes in the north and south direction; include a raised median between the lanes; and include shoulders with separate pedestrian / bicycle trails on each side of the roadway with the following conditions: 1. That an erosion control plan be submitted for City review and approval prior to any grading or construction activity in the floodplain; 2. That at the completion of construction and prior to any final approval of the bridge construction by the City of Louisville, the applicant provides a certification form a registered professional engineer that the grading work has been completed as approved by the Board of Adjustment; and, 3. The applicant must complete a FEMA Elevation Certificate (EC) and an approved copy shall be forwarded to the City upon completion of the work approved by the Board of Adjustment. BOARD ACTION: 5