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Stream Channel Stability <br /> The proposed mining operation will straighten Idaho Creek as it <br /> runs through the property. This creek is in reality a man-made <br /> structure that carries irrigation water. Flow velocities in the <br /> channel have been estimated at 2 to 2.5 feet per second. The <br /> stream channel slope is 0.0022 ft/ft which is within the range <br /> normally expected for irrigation ditches. <br /> The straightening of the channel will increase the slope through <br /> the property to 0.003 ft/ft and in turn a velocity of 2.3 ft/sec <br /> that would occur during high flow (50 cfs) would be increased to <br /> 2 .6 ft/sec. This is not a significant increase in velocity and <br /> would not cause instability in the stream channel. There is no <br /> reason to expect an increase in sediment load downstream due to <br /> this shift in alignment. <br /> Project Water Rights <br /> The property owner has decreed water rights that are associated <br /> with this land. The rights include the Carr Tyler Ditch, the Tom <br /> Delehant Ditch, and some Big T water. Copies of the decrees and <br /> some recent diversion records are attached as proof the water <br /> rights exist. <br /> The Carr Tyler Ditch has a decree for 32.53 cfs and derives its <br /> source from Boulder Creek. The ditch diverts approximately 278 <br /> acre-feet on an average annual basis. The property involved has a <br /> right to 1/16 of this ditch. However, the Kobobel property has <br /> historically diverted approximately 25% of the water available from <br /> the ditch because downstream property owners do not use their full <br /> allotment. The ditch can expect to divert 70± acre-feet on a long <br /> term average. If a 50% consumptive use factor is applied to this <br /> water, then 35 acre-feet would be available for uses associated <br /> with the mining operation. The actual consumptive use would have <br /> to be determined through an engineering study of historic usage. <br /> The Tom Delehant Ditch also diverts from Boulder Creek and has a <br /> decree that has been cut back to 10.0 cfs through abandonment. <br /> This abandonment procedure took place in 1984 . The ditch diverts <br /> approximately 370 acre-feet on a long term annual basis. The <br /> property involved uses approximately 33% of the ditch and can <br /> expect to divert 122 acre-feet on a long term average. If a 50% <br /> consumptive use factor is applied to this water, then 61 acre-feet <br /> would be available for uses associated with the mining operation. <br /> The actual consumptive use would have to be determined through an <br /> engineering study of historic usage. <br /> G-5 <br />