FLOOD01619 - Laserfiche WebLink

Home Browse Search

I I I I I I I I I I I I I I I I I I I V-6 Grass lined channels European channels Natural floodplain $1,000 per grassed acre 1,000 per grassed acre 600 per acre of floodplain At the heart of the fl oodp 1 ai n management program is the attempt to limit future damages from occurring as a result of imprudent development in the floodplain. Any floodplain management program should discourage the devel- opment of flood prone property and shoul d promote compl i ance with the recommendations of this master plan. Additionally, when structures are destroyed by fl ood damages, no attempt shoul d be made to reconstruct those structures within the floodplain unless they satisfy the requirements im- posed upon new construction. TABLE V-3 ANNUAL OPERATION AND MAINTENANCE COSTS Cost estimates Cost estimates developed for the various alternatives include drainage im- provement costs, street crossing costs, utility relocation costs, contin- gencies and property acquisition costs. The first three items entail con- struction costs and are based on estimated quantities for major work items associated with the improvements. Preliminary designs were performed dur- ing the Phase B portion of this study. Quantities were estimated using these prel iminary designs and unit costs were assigned. The costs asso- ciated with improvements on each sheet of the plans are shown on the page facing that plan. The dissemination of information regarding the flood hazards along major drainageways is obviously a vital characteristic of any floodplain manage- ment program. Such measures in themselves should be regarded as supportive measures with which the community can make more prudent decisions to avoid hazardous situations. The development of floodplain information must be accompanied by an information dissemination and education program. Flood- plain maps depicting hazards adjacent to the channel should be distributed for the benefit of councils and commissioners and any citizen organizations which may be interested. In addition to the sheet-by-sheet breakdown presented with the plan sheets, the cost estimates have been broken down by jurisdiction and by reach. Tab 1 e V-4 gi ves the cost breakdown on a reach-by-reach basis. Table V-5 shows the costs broken down by jurisdiction. In areas of significant flood hazard, educational efforts are necessary to make those effected fUlly aware of the risks and also of the range of actions which could be taken to mitigate the effects of flooding. Methods of achieving this objective include meetings, film and slide displays, and the distribution of reports or pamphlets. FLOODPLAIN MANAGEMENT, PRESERVATION AND REGULATION In addition to the structural improvements discussed above, a non- structural solution of floodplain management should be superimposed on the entire lOO-year residual floodplain. In all cases, a vigorous floodplain management program should be maintained. Because both Jefferson County and the City of Arvada have well developed flood management systems in place, the maintenance of these programs has been assumed to apply in all cases. FLOOD FORECASTING AND WARNING SYSTEMS In local flood warnings systems, measurement of precipitation and/or stream levels upstream of an area are used to predict whether flooding will occur, when it will arrive, and its severity. Local flood warning programs must provide for collecting data, making flood predictions, and disseminating warnings. The primary purpose of a flood warning system is to protect life in areas subject to flooding. The amount of damage prevention provided by a flood warning system is related to the length of warning time it pro-