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<br />e' <br /> <br />HUMAN ECONOMICS-The project will provide a more efficient irrigation delivery system <br />for the producers. It will also ensure a reliable water supply with less maintenance costs. <br />The combined impact should be a more cost effective irrigation delivery system, including a <br />reliable late summer and fall supply. <br /> <br />Alt~mative llI-Single Diversion <br /> <br />This alternative would involve building a single diversion at the Williams Ditches diversion site. <br />It would combine the decrees of the Williams, Walker, and Shelton ditches. The Marshall- <br />Roberts and Gibraltar ditches are not included in by this alternative. <br /> <br />ComDonents: <br />The major components are: Diversion, 3,900 ft of new ditch, 15,300 ft of ditch enlargement <br />(capacities up to 138 cfs.) In addition to these improvements there would be a need for several <br />railroad and road crossings, utility crossings, and water control structures. <br /> <br />Costs: $1.353.000 <br /> <br />EFFECTS: <br /> <br />SOIL RESOURCE-Streambank erosion and entrenchment will be reduced but to a lesser <br />extent than the other alternatives. <br /> <br />, SURFACE W A TER- Sediment loading from the project area will not be reduced to the same <br />. degree as with Alternative II <br /> <br />WETLANDS-Where ditch abandonment occurs and the wetland hydrology is disrupted, a <br />negative impact is expected. Other areas will receive more water as a result of combining <br />ditches, thus enhancing existing wetlands. Some new wetlands may be created from the <br />establishment of new ditches. No net negative effects are anticipated. <br /> <br />WATER QUANTITY-With the planned system improvements in places only a partial long- <br />term solution to river impairment and a reliable water source is attained, because the <br />Marshall Roberts and Gibraltar ditches are not included. <br /> <br />PLANTS/RIP ARIAN HABITAT-This alternative would have less of an impact on the <br />habitat, because the affected area has been scaled down the impacts would not be so long <br />term. <br /> <br />Alternate IV- Two Diversians <br /> <br />This alternative would include alternative III plus a diversion near the Marshall Roberts <br />headgate. No enlargement of the Marshall Roberts would be needed. The Gibraltar Ditch would <br />be extended on the north side of the river in an open earthen channel, riprapped as needed. The <br />Gibraltar Ditch extension would be the same as proposed in alternative II <br /> <br />e <br /> <br />4 <br />