2014-10-29_HYDROLOGY - M1982131 - Laserfiche WebLink

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` Bucklen Pit SWSP Page 3 of 9 October 28, 2014 the "first fill" of the pit must be submitted to our office. Should dewatering at the pit cease during this SWSP approval period, this SWSP will automatically be void until an amendment is sought and approved. The monthly evaporative and operational depletions to the Cache la Poudre River were lagged from the pit using the Alluvial Water Accounting System (AWAS) program developed by the Integrated Decision Support (IDS) Group at Colorado State University with the following parameters: • Distance from the centroid of the gravel pit pond to the river (X) = 1,390 feet • Alluvial aquifer width (W) = 10,650 feet • Specific yield (S) = 0.2 • Transmissivity (T) = 120,000 gallons per day per foot Depletions due to past and projected operations at the Bucklen Pit site were calculated to total approximately 37.55 acre-feet during this plan period, as shown on the attached Table 3. Lagged depletions will also occur as a result of the use of Greeley Irrigation Company (GIC) shares for replacement purposes. Pursuant to paragraph 6.7.6 of the decree entered in case no. 1996CW658, the subsurface component of the return flow obligation will be calculated by multiplying the 5-year running average annual farm headgate deliveries of GIC direct flow water and Fossil Creek Reservoir water. The subsurface return flow obligations are based on the average of WY 2010 through WY 2014 deliveries, except for the months of September and October 2014. For those months, deliveries were projected based on the dry-year yield per share since delivery records were not yet available at the time the SWSP request was submitted. The estimated subsurface return flow obligations for WY 2015 for the GIC direct deliveries and Fossil Creek Reservoir deliveries are 15.17 acre-feet and 0.18 acre-feet, respectively (see Table 4). Total replacement requirements due to evaporative consumptive use, operational consumptive use, and subsurface return flow obligations will therefore total 52.90 acre-feet for this plan period, as shown in the attached Table 5. Replacements During the irrigation season of April through October, the replacement source will be consumptive use credits associated with the historical irrigation use of six (6) shares of the Greeley Irrigation Company. During the non-irrigation season of November through March, replacement water will be provided by a lease of 18.8 acre-feet of augmentation water from the City of Aurora. See Table 5 for a monthly breakdown of replacement water for WY 2015. Greeley Irrigation Company ("GIC") Shares The Applicant owns six (6) out of a total of 519.7 GIC shares, all six of which have been dedicated to this SWSP for this plan period. A share of GIC water provides the shareholder with GIC direct flow water and Fossil Creek Reservoir water. The Applicant's GIC shares will be delivered to the Cache La Poudre River at the 23rd Avenue and Fourth Street Return Station (WDID 0302318). Replacements to the river will be made directly adjacent to the Bucklen Pit. Due to the close proximity of the return station to the Bucklen Pit, no transit losses will be assessed for the delivery of the GIC shares. A portion of the Greeley Canal No. 3 (WDID 0300934) was changed in Division 1 Water Court in case no. 1996CW658 based on a ditch-wide analysis by the Poudre Prairie Mutual Reservoir and Irrigation Company ("Poudre Prairie"). The use of the subject ditch shares in this plan shall be in accordance with