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<br />- - <br />=_= TUTTLE APPLEGATE, INC. <br />Consultants for Land and Resource Development <br />Dr. :feris A. Danielson <br />States Engineer <br />July 16, 1990 <br />Page 4 <br />Valuers for the parameters used in the computer model are found in <br />Table No. 4. The well location was assumed to be at the center <br />of the proposed lakes. The impermeable boundary was located on a <br />USGS topographic map. Transmissivity was determined to be 10,000 <br />gpd/1`t. This value may more typically be in the range of 100,000 <br />gpd/ft. for an alluvial aquifer of this size. The decrease in <br />this value represents the condition of the recharge pond which <br />has existed for a minimum of 12 years and over time has become <br />lined with silts and clays. The net effect is a greatly reduced <br />permeability. A value of .2 was used for Specific Yield which <br />would be typical of an alluvial aquifer. <br />The monthly net effect on the stream system for one year is <br />listed on Table No. 4. <br />3. REQUIRED REPLACEMENTS <br />Replacements are only applied to the lake during the irrigation <br />months. The lake must be recharged at the rate of 50 gallons per <br />minute (or at an equivalent volume) for the months of Hay-August <br />and at the rate of 77 gallons per minute (or an equivalent <br />volume) for the month of September in order to avoid depletion in <br />the stream system at any given time. The increase in the amount <br />replaced in September is to compensate for the stream system <br />depletions throughout the winter. <br />The annual total of replacement water needed is 40.86 acre-feet. <br />This figure is greater than the losses that were computed of <br />36.98 acre-feet because of the need to compensate for depletions <br />during the winter. <br />4. SOURCE OF REPLACEMENT <br />Weld County has shares of the Lupton Bottoms Ditch and the Lupton <br />Meadow Ditch Company. The Lupton Bottoms water will be diverted <br />to the Meadow Island Ditch No. 1 and it will be discharged into <br />the existing pond as shown on the enclosed map. Appropriate <br />agreements will be obtained with the various ditch companies. <br />Appropriate dry up agreements exist on the water held by Weld <br />County and will be supplied to Lhe State Engineer upon acceptance <br />of this supply plan. <br />`.a <br />