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<br />. <br /> <br />( <br /> <br />~ <br /> <br />0\ <br /> <br />l <br /> <br />( <br /> <br />,. <br /> <br />- 18 - <br /> <br />. <br /> <br />With the project, the areas where backwater ponding may cause <br />ninor floodwater and sediment damages are primarily commercial in <br />nature, The clean-up of sediment from streets, roads, loading areas, and <br />lawns will be the p'rincipal cost because nearly all of the corcmercial <br />buildings' in. the.se .areas .are buH t up above the depths of damaging <br />ponding. <br /> <br />From an irrigation standpoint, the sporadic flows from Indian Wash <br />have little value locally, The watershed project will reduce flood <br />peaks in the Indian Wash channel and el1ninate-the possibility of a <br />recurrence of interruption of irrigation services fram damages to <br />the Grand Valley Canal, There are approximately 37,380 acres of <br />irrigated land serviced by this canal system. Since this canal is <br />designed to operate under continuous flow capacity/'any damage to the <br />canal will necessitate emptying of the entire system until repairs are <br />made, The flood history of this area indicates that nearly all high <br />intensity storms occur during the crop season. Therefore, any interruption <br />of irrigation services will be serious. <br /> <br />The estimated average annual darnges of ~4,016 due to delay in <br />wat~r delivery through damage to ~he Grand Valley Canal without the <br />project are eliminated with the proposed works of improvement. <br /> <br />. <br /> <br />The estimated average annual floodwater, sediment, and indirect <br />d~uage in the watershed amounts to $25,615. Land treatment measures <br />to be installed will reduce these damages to $24,465 or a reduction of <br />approximately 4.5 percent. The structural measures will further reduce <br />the remaining damages to ~1,725 or a reduction of approximately 89 <br />percent. <br /> <br />Annual flood prevention benefits accruing~o the floodwater- <br />retarding structure are $14,905 as a result of reduction of floodwater <br />damages, $5,555 from sediment damage reduction, and $2,280 from reduction <br />of indirect damages.. <br /> <br />In addition to the above benefits there are secondary and intangible <br />benefits that accrue to the project. Although not evaluated in monetary <br />terms, a high level of flood protection to human life and property has <br />a value to the individual and to this rapidly grol'ling community. In <br />addition, labor saved fram clean-up and repair of flood damages can be <br />utilized for the productive and professional services nor.mally available <br />to the ccmmunity. <br /> <br />. <br />