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Cheryl Signs, P.E. Page 4 <br /> Durham Combined SWSP <br /> August 12, 2014 <br /> pro-rata amount of the monthly gross evaporation rate distribution amount identified in the State Engineer's <br /> General Guidelines for Substitute Supply Plans for Sand and Gravel Pits, subtracting the pro-rata amount <br /> of the effective precipitation for that period. <br /> Laqged Depletions <br /> The monthly depletions to the river were lagged from the pit site using the AWAS program <br /> developed by the IDS Group at Colorado State University. The parameters used in the model are <br /> shown in Table D below: <br /> TABLE D—AQUIFER PARAMETERS <br /> Distance to river Aquifer Boudary Transmissivity Specific Yield <br /> (X),ft (W),ft (T), pd/ft <br /> Durham Pit 1,100 2,600 100,000 0.28* <br /> Feit Well 1,100 2,600 100,000 0.2 <br /> Western Sugar Pit 1,350 2,600 100,000 0.28* <br /> Dakolios Pit 550 3,500 100,000 0.2 <br /> *Based on the USGS Water Supply Paper 1662D <br /> The analysis took the depletions to a steady state condition. Therefore the lagged depletions <br /> equal the consumptive use on an annual basis at a monthly rate as shown in Tables 2, 4 and 6. In total, <br /> this SWSP is required to replace 211.45 acre-feet per year. <br /> Replacement <br /> The proposed sources of replacement for the three sites and the Feit Well included in this <br /> amended SWSP are VCI's ownership in Rural Ditch, Hayseed Ditch, GIC, Last Chance Ditch and Godding <br /> Ditch and if necessary portions of junior storage. <br /> Five shares of Greeley Irrigation Company <br /> The five shares of the GIC were determined to yield 48.7 acre-feet per year(93.18 acre-feet of <br /> headgate deliveries and 44.5 acre-feet of return flow obligations) of historic stream depletions from the dry- <br /> up of 33.7 acres of land historically irrigated with five shares interests in Greeley Canal No. 3 and 2.9 acre- <br /> feet per year (4.9 acre-feet of deliveries and 2 acre-feet of return flow obligations) of historic stream <br /> depletions in the applicant's interest in the Fossil Creek Reservoir diverted from the Cache la Poudre River <br /> and previously used for irrigation of the mined property. The values for the historical use credits of the five <br /> shares of Greeley Canal No. 3 were prorated from the historical use analysis values decreed for the <br /> Greeley Irrigation Company in Case No. 96CW658. After applying the five shares of Greeley Canal No. 3 <br /> and the Fossil Creek Reservoir water, there will be 157.30 acre-feet of uncompensated depletions at Feit <br /> Well, Durham Pit and the Western Sugar Pit (Table 7). <br /> Rural Ditch (Case No. 2003CW306) <br /> VCI owns 4 shares (or 6.64 cfs) of the Rural Ditch Company, which were changed in case no. <br /> 2003CW306. The 4 shares of the Rural Ditch were historically used to irrigate on average 212 acres on <br /> three farms. Based on a farm irrigation efficiency of 65 percent and a ditch loss of 10 percent the court <br /> found that the average annual consumption associated with the historical use of the four shares has <br /> been 248 acre-feet. The decree in case no. 2003CW306 limits the diversion season from April 1 <br /> through October 31. In addition, the decree in case no. 2003CW306 also limits the maximum monthly <br /> and annual volumetric delivery and the twenty year consecutive period to the following acre-feet <br /> amounts: <br />