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<br />0025'73 <br /> <br />2.2.2,3 Out I et Works - The out I et works wou I d cons i st of an Intake <br />structure with an emergency slide gate connected to a 6-foot (1,8 m) <br />diameter conduit ending in the gate structure and stilling basin. The <br />outlet works are designed to pass approximately 1100 cfs (31 m3/s) at <br />elevation 5317.5 feet (1621 m). The conduit would be sized to <br />accannodate a 2000 kw (7200 MJ) hydroelectric plant In the future. <br />The location of the outlet works would require the excavation of an <br />Inlet and outlet channel. <br /> <br />2.2.2,4 Material Sources - Approximately 265,700 cubic yards (203,140 <br />m3) of material would be needed to construct the dam, The majority of <br />the borrow materials lie within the reservoir basin, There are two <br />borrow areas located outside of the reservoir basin. The first area <br />lies approximately 300 yards (274 m) east of the right abutment and <br />covers roughly 5 acres (2 ha), The gravelly material would be used <br />for Reinforced Earth(r) wall fill and fll ter material, The second <br />borrow area consists of a hard sandstone ledge to be used for riprap, <br />it Is estimated that approximately 10 acres (4 ha) will be disturbed. <br />Concrete aggregate would rrost 1 ikely cane from Jensen, Utah, The <br />borrow area locations are shown on Figure 2 - 4, <br /> <br />2.2.3 Reservoir Operation <br /> <br />, . <br /> <br />2.2.3.1 A water supply study by Western Engineers, Inc. Indicates <br />that If the future water development outlined In the report becanes <br />reality, the reservoir, during average years would be drawn down 3000 <br />to 4000 acre-feet (3.7 to 4,9xI06m3) every other year based on <br />historical records.(26) No way exists to predIct at what rate <br />development In the White River Basin will take place. In a <br />supplemental water supply study it was assumed development would be <br />uniform over a 20 year period starting In 1982, The results of the <br />study indicated the reservoir would remain full during the first 18 <br />years except In a drought year such as occurred in 1977, After the <br />first 16 years the reservoir would draw down approximately every other <br />year as Indicated above. <br /> <br />13 <br /> <br />,K-. <br />