FLOOD08407 - Laserfiche WebLink

Home Browse Search

COMMENTARY - SHEET 17 Cost $ 382,800 $ 151,200 $ 44,900 $ 578,900 $ 144,700 $ 723,600 $ 255,000 $ (7,700) $ 111,500 $ 1,090,100 I I I I I I I I I I I I I I I I I I I Residents in the vicinity of the 100-year floodplain should be notified annually of the potential flood hazards. Since the improvements are designed for the 25-year event, the continued enforcement of floodplain regulations and an ongoing program of floodplain management will be necessary after the proposed improvements are built to compensate A bridge or multiple barrel culvert is proposed at Station 48 + 32 to replace the existing 4' diameter culvert beneath the C & S Railroad tracks (see Sheet 16). Construction of the improved crossing will eliminate the back water which now occurs between the railroad tracks and Federal Boulevard. The unaccommodated runoff from the 100-year event, approximately 400 CFS, would spill out of the proposed channel near the railroad crossing at Station 48 + 32, and flow parallel to the railroad tracks on the west side, Downstream from the crossing to West 64th Avenue (Sheet 18), a grass-lined channel, which is designed for the 25-year event, would convey the remainder of the 100- year flood but flowing at full depth with no free board. for larger floods. TOTAL IMPROVEMENT COSTS - SHEET 17 Item Channel Improvements Street Improvements (Railroad Crossing) Utility Relocation A maintenance trail is proposed to provide access to the channel reach. Two sanitary sewers presently cross the existing channel and it is likely that these utilities will need to be relocated to construct the proposed channel. The cost to relocate the lines is included in the estimate. The utility relocation costs could be reduced during final design as more field information is accumulated. SUB-TOTAL Contingencies (25% of Sub-Total) The existing floodplain should be regulated and property owners who would be adversely affected by the 100-year flood should be encouraged to acquire flood insurance. Residents in the vicinity of the 100-year floodplain should be notified annually of the potential flood hazards. Since the improvements are designed for the 25-year event, the TOTAL CONSTRUCTION COSTS Right-of-Way Acquisition Annual Operation and Maintenance Costs Present Worth Operation and Maintenance Costs continued enforcement of floodplain regulations and an ongoing program of floodplain management will be necessary after the proposed improvements are built to compensate TOTAL IMPROVEMENT COSTS for larger floods.