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• The unconfined alluvial aquifer has a specific yield (S) of 0.2. <br />• The transmissivity (T) value of 10, 000 ftz per day per foot. <br />_ The distance (d) from the centroid of the pit to the return reach of the river was estimated at <br />1,450 feet :from 1:24,000 USGS topographic maps. <br />• The SDF f<rctor for the pit is 42.1 days (SDF =d2(S)/T). <br />The output from the stream depletion model is a record spanning the study period showing <br />the depletions due Ito the use of water from the pit approaching a quasi steady-state condition toward <br />the end of the period. The values taken from the final year of the model output are shown in <br />Table 4.2, these steady-steady state values are the depletions owed to the stream by the Timnath Pit: <br />Table 4.2 Lagged Stream Depletions from Timnath Pit (AF). <br />Jnn ~~I~ch <br />_ -- --- I- <br />__ - ;11ar <br /> <br />-- -- Aj~r_ ~ iU~iy Jun Jul Auk Scj~ ~' Oct <br /> <br /> <br />- hog ~ Ucc <br /> <br /> <br />- Total` <br />~-a~,~~~~1 S1eam [h~~lctions -3.2 -3.0 -3.0 -3.6 -5.1 -6:7 -8.1 -8.8 -8.4~ -6.6 -4.9 -3.8 -65.2 <br />4.3 Current Irrigation Practices <br />Currently; all 151.7 acres of irrigated pasture on the property have been dried up. The <br />historic average annual actual CU associated with the irrigated pasture was 121.6 AF. The remaining <br />areas of agriculture; consist of 70.1 acres of corn and 20.6 acres of alfalfa being grown in the <br />traditional location; as noted on Figure 3.2. S WE :performed a consumptive use analysis on the <br />currently irrigated areas of the property that resulted in the following average annual values: The <br />CIR of the corn and alfalfa mixture =1.4 feet, irrigated- area = 90.7 acres, calculated CU =123.2 AF, <br />potential IWR = 20`x.3 AF, and actual CU =117.2 AF. The net CU credit from dry-up, as calculated <br />in section 4.1, is 77.,0 AF. The average monthly CU values for the current irrigated area are listed <br />along with the Timnath Pit depletions in Table 4.1. <br />4,4 Operation of Plan <br />4.4.1 Repl~xcement Supply <br />The average monthly values presented in Table 4.1 indicate that the 3'/2 shares of Boxelder <br />owned by DKC will be an adequate replacement source for depletions arising from the operation of <br />the Timnath Pit. L>uring the irrigation season the amount of water associated with the lands <br />C:\Projects\CODKCOI\Admin\DKC 2006 SWSP Application.doc 12 Scott Water Engineers, LLC <br />