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<br />11. ENVIRONMENTAL IMPACTS <br /> <br />e <br /> <br />With the either alternative (V or IIA) involving two permanent diversion structures, there will be <br />a number of impacts most all of which are favorable. <br /> <br />SOlL RESOURCE- There will be streambank disturbance in the areas where <br />construction will occur; however, it will be a short-term effect. Streambed disturbance <br />during annual diversion construction will be eliminated. With better control of the <br />diversion greater streambank stability is expected. <br /> <br />WETLANDS-Some areas may receive less water as a result of moving or eliminating <br />portions of the five ditches involved in the project. Other areas may receive more water <br />as a result of increased seepage from combined ditches. No net change in acreage or <br />values is expected. <br /> <br />WATER QUALITY-With the planned system improvements in place there will not be a <br />problem being able to divert the agricultural producers decreed water. The improved <br />system will also eliminate some seepage losses presently occurring especially during <br />periods of low river flows. There will be a substantial reduction of sediment loading <br />from the annual "wash out" of the temporary diversion structure. Water quality should <br />improve. <br /> <br />PLANTS/RIP ARIAN HABITAT -Some habitat will be destroyed during construction but <br />most of it will return. <br /> <br />. <br /> <br />ENDANGERED FISH-Since the project is located upstream of the designated habitat of <br />the endangered fish, it is unlikely the project will have any effect on the endangered fish. <br />It is predicted that the project will have positive effects on non-native fish because of the <br />elimination of the annual construction disturbance and the provision of fish and vessel <br />passage through the proposed structures. <br /> <br />HUMAN/CULTURES RESOURCES-There are no known cultural resources in the areas <br />of construction therefore no impacts are anticipated. <br /> <br />HUMAN/ECONOMICS- The project will provide a more efficient irrigation delivery <br />system for the producers. It will also ensure a reliable late summer water supply with <br />less maintenance costs. The combined impact should be a more cost-effective irrigation <br />delivery system and eliminate the yearly construction costs of the temporary structures of <br />costing $1500 to $2000 each. <br /> <br />12. WATER RIGHTS <br /> <br />a. Water rights together with adjusted flows & ownership are tabulated in exhibit "C." Under <br />Alternative V diversion at the Marshall-Roberts headgate based on the total of the absolute rights <br />will be Marshall-Roberts (19.19) plus Williams (19.43) equals 38.62 cfs. At the Walker <br />diversion it will be Walker (44.50) plus Shelton (52.52) equals 98.02 cfs. A tabulation of water .. <br />-Use' is included as exhibit "D". Under Alternative IlA with all four ditches diverting at ' <br />Marshall-Roberts the total diversion based on adjudicated water rights would be 136.64 cfs. <br /> <br />e <br /> <br />10 <br />