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I I I I I I I I I I I I I I I I I I I II. WATER SUPPLY A~D REQUIREMENTS A. Surface Water Supply 1. Raw Water Transmission Facilities The City derives its raw water supply from South Boulder Creek through a variety of direct flow and storage water rights. The City's main raw water conveyance facility consists of approximately 8 miles of steel transmission line ranging in size from 14" to 18" which conveys water from the City's intake at Eldorado Springs to Louisville Reservoir. Water is delivered directly from Louisville Reservoir to the City's water treatment plants located adjacent to the reservoir. The rated capacity of the Eldorado Springs pipeline under gravity flow is approximately 3.4 million gallons per day (5.26 cfs). A booster pump station, which can increase the capacity of the raw water transmission line to 5.0 mgd (7.74 cfs), is located on the Eldorado Springs pipeline in the approximate vicinity of Marshall Road north of Marshall Lake. The Eldorado Springs pipeline and other raw water facilities of the City of Louisville are shown on Figure 2. The other primary raw water conveyance facility owned by the City is the Louisville Lateral which conveys water from the Community Ditch below Marshall Lake to either Harper Lake or Louisville Reservoir. The rated capacity of this ditch at the critical section is approximately 7.8 mgd (12,Ocfs). However, the ditch could easily be enlarged to convey approximately 10 mgd (15.48 cfs). The capacity of the Louisville Lateral between Harper Lake and Louisville Reservoir is estimated at 24 cfs. Overall existing losses in the Louisville Lateral are estimated at 5 to 10 percent. The lateral is used during the season when the Community Ditch below Marshall Lake is operable and therefore, has not been used in the past as a source of raw water during the winter. During the irrigation season, 8