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Long Hollow Dam and Reservoir Phase I Summary Report <br /> would be 1,470 AF/yr. Depletions are expected to range from approximately 100 AF to 3,600 <br /> AF/yr. <br /> 1.3 Project Purpose <br /> The dual purposes of the Long Hollow Reservoir project are to: <br /> 1. Supplement the water supply to existing irrigated lands in Colorado. <br /> 2. Assist the State of Colorado in meeting its delivery obligations under the Compact, thus <br /> decreasing the number, duration, and magnitude of valid Compact calls against existing <br /> Colorado ditches. <br /> 1.4 Project Need <br /> Article II of the Compact requires, in part, that: <br /> a. Each state shall have the unrestricted right to use all the water that may flow within its <br /> boundaries between December 1St and February 15th, and on each day from February 15th <br /> to December 1st when the mean daily flow at the Interstate Station is 100 cubic feet per <br /> second(cfs) or more. <br /> b. On all other days, the state of Colorado shall deliver at the Interstate Station a quantity of <br /> water equivalent to one-half of the mean flow at the Hesperus Station for the preceding <br /> day, but not to exceed 100 cfs. <br /> Currently, flows measured at the Hesperus, Colorado gauge must travel approximately 31 river <br /> miles to the State Line gauge at the Colorado-New Mexico border. In many years, following <br /> spring runoff, the arid climate, high summer temperatures, and other natural conditions create a <br /> dry riverbed. This dry riverbed can continue for periods of time along stream reaches that may <br /> extend for miles. The La Plata River, beginning near Breen, Colorado and continuing <br /> downstream to its confluence with Cherry Creek, is the primary reach of the La Plata River that <br /> loses a significant amount of stream flow, particularly during the low flow periods of the year. <br /> 991-077.115 Wright Water Engineers, Inc. Page 3 <br /> July 2004 <br />