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<br />.:\;:':/~~' ::", ,~:' <br />. '~~ ': .',': <br />tr'~'" .. <br /> <br />EFFECTS AND ECONOMIC FEASIBILITY <br /> <br /><:'1 <br />CJ <br />N <br />"" <br />C) <br />Ul <br /> <br />With the propDsedstructural measures the Amity Canal and downstream <br />flood plains on the Wiley and Pleasant Valley drainages will have full " <br />flood protecti on up to the 25-year event and parti a 1 protecti on from the <br />more severe events. Also, interruption of irrigation services would <br />o~cur on l.y frDm even ts greater than the 25-year freq uency. <br /> <br />Total average annual benefits are estimated at $45,400. Direct average <br />annual benefits derived from the installation Df this project'will amount <br />to an estimated $34,500, 19cal secondary benefits of $2,700, and redevelop- <br />ment benefits Df $8,200 (Table V).' , , <br /> <br />The annual cost is based on amortizatiDn of structural measures for <br />a 100-year prDject life at seven percent interest rate. This annual cost, <br />including operation and maintenance, is estimated to be $44,200 (Table III). <br />The resulting overall benefit-cDst ratiD is 1.0 tD 1.0 See Table V for. <br />a comparison of benefits and costs. <br /> <br />A L T ERN ATE 0 R ADD I T I 0 N'A L P 0 S SIB I LIT I E S <br /> <br />An aJternatiye proposal of including the May Valley drainage area in <br />the prDject was considered. The May Valley drainage, (29.sq. mil, which <br />is east of the project area, contributes to high canal maintenance, however, <br />it has caused canal bank failure only once in the past 15 years. This is <br />conside,r ably less frequent thar the Wiley and Pleasant Valley drainages with <br />a corresponding negative affec(Dn the project benefit-cost ratio. <br /> <br />Considerable streambank stabilization could be installed along the' <br />natural channel above the Amity Canal. Floodwater dama~e to upstream <br />roads and bridges cDuld be minimized with more adequate bridges and <br />possibly some diking. <br /> <br />, . <br /> <br />, , <br /> <br />The potential fDr floodwater retarding structures is unfavorable <br />, because of the topography and land use. The topography is such that <br />adequate floDdwater storage could not be achieved without a number of <br />retarding structures each of which would be located Dn valuable crDpland. <br /> <br />. <br /> <br />\, <br /> <br />-4- <br />