2012-03-14_HYDROLOGY - M2004051 - Laserfiche WebLink

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Jared Dains South Platte Combined Replacement Plan March 14, 2012 Page 7 the 13.5 Whitney Ditch shares has been estimated from a dry-up farm headgate delivery of 24.75 acre -feet per share (which include the 15% ditch loss) or approximately 334 acre -feet for the 13.5 Whitney Ditch shares. After accounting for the return flow obligations the total consumptive use credit for 2012 is projected to be approximately 190.03 acre -feet. During the 2011 irrigation season Aggregate utilized the return structure owned by the Whitney Irrigation Company located in the SE1 /4 of Section 30, Township 6 North, Range 66 West. Aggregate anticipates that this return structure will be utilized again in 2012. A copy of the agreement with Whitney Irrigation Company needs to be submitted to the State Engineer's Office if the return structure will be utilized in 2012. The dry -up locations for these shares were originally identified through an April 12, 2011 letter to the Division 1 Engineer. That letter stated the northern portion of Orr Farm #1 may continue to be irrigated using 1 of the 13.5 Whitney Ditch shares owned by the Applicant. In 2011 the entire Orr Ditch Farm #1 was removed from irrigation due to damage to the lateral serving the property. Therefore the entire farm is now included as a dry-up location for all 13.5 shares dedicated to the plan in 2012. A revised share dedication dated February 29, 2012 is attached. The revised 2012 dry -up maps are to be provided by April 1, 2012 in accordance with our dry up protocol. Boyd & Freeman Ditch The 240 Boyd and Freeman Ditch shares were historically used to irrigate 85 acres of pasture grass. Using a Blaney - Criddle analysis the potential crop consumptive use for the 85 acres was determined to be 142 acre -feet. Assuming a 10% ditch Toss and 55% farm efficiency the dry year consumptive use was determined to be 99.28 acre -feet. The applicant will utilize all 240 shares in this plan. The Boyd and Freeman Ditch shares were sold to the City of Greeley ( "Greeley ") in 2011. Greeley, in a letter dated September 12, 2011 confirmed that Aggregate may continue to utilize these shares for this plan. Before any credit can be taken for the Boyd & Freeman Ditch, accurate measuring and recording devices must be installed and those devices must be approved by George Varra, the District 3 Water Commissioner. The City of Greeley is currently designing an augmentation station for the Boyd and Freeman shares and anticipated that construction will be complete before the 2012 irrigation season. If the Boyd & Freeman augmentation station will not be installed, Aggregate will request more water from the City of Greeley or the Platte River Power Authority and the Boyd and Freeman shares will not be used for replacement purposes during this plan period. The expected consumptive use credit for the 240 shares of the Boyd and Freeman has been estimated from a dry -up farm headgate delivery of 0.77 acre -feet per share (which include the 10% ditch loss) or approximately 184 acre -feet for all 240 shares. After accounting for the return flow obligations the total consumptive use credit for 2012 is projected to be approximately 142 acre -feet. This value is greater that the estimated dry-year yield because no deliveries were made in 2011, thus Aggregate does not owe any subsurface return flows for 2012. City of Greeley Lease The Applicant has leased 22 acre -feet of fully consumable replacement water from the City of Greeley ( "Greeley "). As mentioned above, if the Boyd & Freeman augmentation station will not be installed Aggregate will request more water from Greeley. Additionally, pursuant to the mining lease Agreement between Aggregate and Greeley for the East 8 Street Pit, Greeley will provide augmentation water for this pit. In 2012 the replacement obligation for this pit totals 29 acre -feet and you are requesting to make block releases in April and October 2011. A copy of the Greeley leases were provided to this office with the SWSP request and are attached to this letter.