2015-11-03_HYDROLOGY - M1982131 - Laserfiche WebLink

Home Browse Search

Bucklen Pit SWSP Page 3 of 8 October 27, 2015 • 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 41.09 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 2011 through WY 2015 deliveries, except for the months of August, September, and October 2015. 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 2016 for the GIC direct deliveries and Fossil Creek Reservoir deliveries are 13.55 acre-feet and 0.21 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 54.85 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 2016. 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 the terms and conditions decreed in case no. 1996CW658, including monthly and annual volumetric limits on water deliveries and monthly return flow requirements. The decree in case no. 1996CW658 found that 519.7 shares were used to irrigate 3,501 acres with an average historical consumptive use of 5,358 acre-feet per year, which yields an average consumptive use credit of 10.31 acre-feet per share (5,358 acre-feet : 519.7 shares). Based on the above, the six shares to be used in this plan result in a consumptive use credit of approximately 61.86 acre-feet per year (10.31 acre-feet per share x 6 shares). One of the Applicant's six shares was associated with Farm W-49, which is now dried up because it is part of the Bucklen Pit. The other five shares were referred to as "floating shares" in case no. 1996CW658. In