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<br />TOTAL IMPROVEMENT COSTS <br /> <br />Cost <br />$ 0 <br />$ (840) <br />$12,200 <br /> <br />$12,200 <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />COMMENTARY - SHEET 9 <br /> <br />The moderate potential flood damage created by the backwater at Yarrow and <br />Vance Streets and the overtopping of Wadsworth Boulevard does not economically justify <br />any structural channel improvements. In addition, the ,3 foot of depth at which the 100 <br />year storm overtops the crown of Wadsworth is sufficiently shallow to meet the Urban <br />Storm Drainllll:e Criteria Manual Recommendations (Reference E) as they pertain to <br />arterial streets. Twin 8' x 6' concrete box culverts have been constructed during the <br />writi~ of this report, connecti~ culverts beneath Yarrow and the private drive at Station <br />259 + 60. <br />Debris, trash, uprooted vegetation, and other material should be removed and kept <br />out of the channel to avoid any impediment of flow, particularly through the extended <br />culvert section. Floodplain use should be controlled and floodplain regulations should <br />continually be enforced. Special effort should be directed towards the monitoring of <br />further construction of underground culverts in this section of channel, as improper <br />extension of the existing culvert will result in a more severe backwater effect at the <br />inlet. Property owners who would be adversely affected by the 100-year flood should be <br />encouraged to acquire flood insurance. Residents in the vicinity of the 100-year flood <br />plain should be notified annually of the potential flood hazards. <br /> <br />TOTAL CONSTRUCTION COSTS - SHEET 9 <br />Item <br />TOTAL CONSTRUCTION COSTS <br />Annual Operation and Maintenance Costs <br />Present Worth Operation and Maintenance Costs <br />