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which would be obtained by eliminating the bridges at the Vrain, Utica, and Della Villa I I I I I I I I I I I I I I I I I I I COMMENTARY - SHEET 14 construction costs. The proposed channel may need to be altered if significant differences The full width of the 50-foot wide drainage and utility easement will be utilized in between the location maps and the field survey of utilities appear during the final design. conveying the 10-year design flood from above Vrain Street to below Tennyson Street. 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 10-year event, the continued enforcement of floodplain regulations and an ongoing program of floodplain The construction of concrete walls will be necessary in this reach to prevent right-of-way requirements from exceeding the width of the existing drainage easement. This eliminates the need for the costly purchase and/or relocation of structures adjacent to the easement. It will be necessary, however, to relocate or encase the 18" sanitary sewer which also occupies the easement. A 38-foot wide by 6.4-foot high bridge opening is management will be necessary after the proposed improvements are built to compensate proposed in conjunction with the walled channel section to convey the 10-year flood for larger floods. beneath the Vrain, Utica, Tennyson Streets and Della Villa Apartments crossings. TOTAL IMPROVEMENT COSTS - SHEET 14 Below the Della Villa crossing, the improved grass-lined channel is to closely follow Street and West 72nd Avenue crossing. Downstream, the flow is to be conducted beneath Street Improvements Cost $ 422,700 $ 411,800* $ 391,700 $ 221,200* $ 103,300 Item Channel Improvements the historic channel. A double 11' x 6' concrete box culvert is proposed to parallel the existing double 13.5' x 6.6' concrete box to convey the 10-year flood beneath the Raleigh the Osceola Street crossing with a new 38-foot wide by 6.0-foot high bridge opening. Drop Utility Relocation structures are to be utilized just above and below Osceola Street to reduce channel slopes SUB-TOTAL $ 917,700 $ 736,300* $ 229,400 $ 184,100* and limit channel velocities to within permissible limits. Included in the cost estimates are figures with asterisks which designate costs Contingencies (25% of Sub-Total) Apartments crossings. This could be accomplished by gaining access to the parking lot north of the Della Villa crossing through an existing parking lot from Tennyson Street. TOTAL CONSTRUCTION COSTS $ 1,147,100 $ 920,400* $ 23,100 $ (3,300) $ (3,700)* $ 47,800 $ 53,600* Since access to the north and south sides of the channel at Utica and Vrain Streets could Right-of-Way Acquisition Annual Operation and Maintenance Costs be gained from West 74th and 72nd Avenues, respectively, the streets could terminate in Present Worth Operation and Maintenance Costs cul-de-sacs at the channel. The elimination of these bridges would reduce construction costs and would create longer stretches of green belt. TOTAL IMPROVEMENT COSTS $ 1,218,000 $ 997,100* Utilities shown on the facing sheet were plotted using available utility location maps, The dense network of utilities, which frequently crosses the proposed channel alignment, will require numerous relocations and consequently result in increased *Asterick denotes those costs revised by eliminating bridges at Utica and Vrain Streets and alley to Della Villa Apartments.