HYDRO31448 - Laserfiche WebLink

Home Browse Search

Donald E. Frick, E.I.T. South Platte Combined Replacement Plan November 14, 2006 Page 7 of 12 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 Thomton Lease Aggregate currently has access to a lease with the City of Thomton for fully consumable effluent from the Metro Wastewater Treatment Plant. The lease provides up to a total of 12.2 acre-feet of fully consumable effluent from November through March or 2.44 acre-feet per month. 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 loss was assumed as well as a farm efficiency of 50%. The return flow obligations, which were not addressed in the above decree, were calculated for this 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. Brighton Ditch The 1.323 shares of Brighton ditch were historically used to irrigate the three farms described below: The 4/14"' share was historically used to irrigate 64.9 acres of pasture grass at the Getz Farm. Using aBlaney-Griddle analysis the potential crop consumptive use for the 64.9 acres was determined to be 106.53 acre-feet. Assuming a 10% ditch loss and 55% farm efficiency the dry year consumptive use was determined to be 56.19 acre-feet. The 4/6"' share was historically used to irrigate 40.4 acres at the Wattenberg Property consisting of 50% pasture grass and 50% alfalfa. Using aBlaney-Griddle analysis the potential crop consumptive use for the 40.4 acres was determined to be 73.23 acre-feet. Assuming a 10% ditch loss and 55% farm efficiency the dry year consumptive use was determined to be 73.06 acre-feet. The 0.371 shares were historically used to irrigate 72.1 acres at the Haake Property along with 5.75 shares of New Granter Ditch. The property consists of consisting of 50% pasture grass and 50% alfalfa. Using aBlaney-Cdddle analysis the potential crop consumptive use for the 72.1 acres was determined to be 130.75 acre-feet. Assuming a 10% ditch loss and 55% farm efficiency the dry year consumptive use for the 0.371 Brighton ditch shares was determined to be 55.2 acre-feet. Aggregate will utilize the entire 1.323 shares for use in this plan. Westminster 1999 The 1999 conditional lease with the City of Westminster will provide 2.0 cfs of fully consumable effluent every day from November 10 to March 20 beginning on November 10, 2000. This lease has a maximum duration of eight years. Additionally, under this lease, the City, at its discretion, can make replacements at either Metro Wastewater Treatment Plant or the Big Dry Creek Waste Water Treatment Plant. The lease provides 515.70 acre-feet annually.