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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Colo. Water Conservation Board <br />September 28, 1989 <br />Page 5 <br /> <br />hTtl!BtlOD Use <br /> <br />1. 3,500 square-feet per dwelling <br />2 Average lawn irrigation water reqllirement = 284 ac-Wac (34 inches) <br />3. No credit for return flows from lawn irrigation. <br /> <br />It is also assumed that the storage releases from Bear Creek Lake would be used <br />to offset the stream depletions resulting from municipal diversions from Bear Creek by <br />MCMD. i.e., ten percent of the water divened for in-building uses plus 100 percent of <br />the water diverted for outside irrigation uses. Releases would also be made to cover winter <br />retum flow obligations of 22 acre-feet per year for the Robert Lewis Ditch. <br /> <br />Using these criteria, an in-house operation study of the available supply (Tables <br />A &. B) vs. the municipal demaod was made, assuming that MCMD had use of o~iV 50 <br />acre-feet of storage capacity in Bear Creek Lake, a value whicn corresponds to MCMO's <br />, <br />initial request for storage. The results show that about 540 single family equivalent units <br />(SFE) could be supplied. At this level of development, in most years of study. there were <br />substantial spills from the lake because the available supply from the Robert Lewis and <br />Hock-Hocking rights exceeded the demand and the 50 acre-feet of capacity in the lake_ <br />However. in the dry period 1954-56, when there was essentially no Robert Lewis water <br />available, the storage was fully utilized and was nearly drawn down to zero. The daily <br />'RELEASE" requirement for the option with 50 acre-feet of storage capacity (540 SFE) is <br />listed in Table 2 <br /> <br />A second analysis was made to determine now many SFE could be supplied given <br />the same water supply (Robert Lewis + Hock-Hocking) but with a carry-o~er storage <br />capacity of 650 acre-feet in Bear Creek Lake. This study indicated that about 1.270 SFE <br />could be provided without fully draining the storage. This represents about 3S percent of <br />the estimated build-out in the MCMD. Spills from the lake did oat occur and there was <br />