2013-01-10_HYDROLOGY - M1999098 - Laserfiche WebLink

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Jared Dains South Platte Combined Replacement Plan January 9, 2013 Page 11 Centennial letter dated November 8, 2012 confirming their lease was provided to this office with the SWSP request and is attached to this letter. Westminster 1998 Lease The 1998 effluent lease with the City of Westminster is a perpetual lease that provides 0.28 cfs of fully consumable water every day of each year (average 16.89 acre -feet per month) and an additional 0.17 cfs every day from October 1 to June 30 during each year (average 10.25 acre -feet per month). The lease provides 294.79 acre -feet annually. Westminster Annual Pursuant to a March 4, 2010 Consumable Water Lease Agreement with the City of Westminster, Aggregate may lease up to 519 acre -feet of consumable water annually, with a minimum lease of 150 acre -feet per year. Deliveries under this lease are available from November 10 through March 20 from either the Metro Wastewater Treatment Plant or the Big Dry Creek Wastewater Treatment Plant. For 2013, Aggregate is leasing 151 acre -feet under this lease agreement. For this SWSP transit losses were assessed assuming deliveries will be from the Big Dry Creek Wastewater Treatment Plant. Thornton Lease Aggregate has a perpetual lease of 10.53 acre -feet of fully consumable effluent from the City of Thornton, which will be released from the Metro Wastewater Treatment Plant from November 1 through March 31 Fulton Ditch The historic use of the 96 Fulton ditch shares yields 235.88 acre -feet of water during April through September while generating 67.75 acre -feet of return flow obligation during October through March. This quantification is based on the technique used in the March 24, 1999 approval for the Fulton Lakes Pit, where the historic consumptive use values were determined using an analysis decreed in case number 82CW393. In this approach, headgate diversions were based on average monthly values for the period of 1976 -1988 and a 10% conveyance Toss was assumed as well as a farm efficiency of 50 %. The return flow obligations, which were not addressed in the above decree, were calculated in the previous plan using a SDF value of 270 days and the assumption that all water diverted but not used by the crops is returned to the stream system through deep percolation. The expected consumptive use credit for the 96 Fulton Ditch shares for 2013 has been estimated from a dry -up farm headgate delivery of 3.50 acre -feet per share or approximately 336 acre -feet for the 96 Fulton Ditch shares. Because there is no immediate surface component the return flow obligations were calculated as a percentage of the previous year farm headgate delivery. In 2012, Aggregate delivered only 197 acre -feet of the Fulton Ditch shares because the full yield of the water right was not needed to meet the replacement obligations. The total consumptive use credit in 2013 is projected to equal 237.79 acre -feet, which is greater than the dry-year yield because of the reduced subsurface return flow obligation requirement resulting from low deliveries in 2012. Brighton Ditch Pursuant to a March 4, 2010 Water Lease with the City of Westminster, Aggregate has the right to use 1.038 shares in the Brighton Ditch Company owned by the City of Westminster for augmentation purposes. Included as a part of the total shares is 416 of a share historically used to irrigate 40.4 acres at the Wattenberg Property consisting of 50% pasture grass and 50% alfalfa. Using a Blaney - Criddle analysis the potential crop consumptive use for the 40.4 acres was determined to be 73.23 acre-