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Flatiron Companies plans to develop a portion of the site for residential use. The remainder of the property will be developed for raw water storage. The reservoir planned for the site has an estimated capacity of 600 acre feet. A reservoir on the Rigden property could easily divert and store reusable water that ELCO plans to claim from both the Boxelder and Drake wastewater treatment plants. The change-of-use decrees for the native water supplies owned by ELCO will allow the District to "use to extinction" all the reusable water it can account for. All the reusable water owned by the District will be treated just upstream of the Rigden property. The ability to divert reusable water almost immediately after it is discharged from the wastewater treatment facilities makes the Rigden property an ideal site for a storage reservoir. Figure 5.3 shows the amount of storage ELCO plans to develop and the date each storage project will be available for use by the District. Figure 5.3 - ELCO Water District Water Raw Water Storage Capacity 6,000 Overland Trail Ponds Phase III '-.. ----------------------------------------~------------------------- __ 5,000 CD 2 Q) U 4,000 ~ Q) 0) ~ 3,000 U5 CD ~ 2,000 S S ro a: 1,000 " Overland Trail Ponds A1ase II ~ Halligan Reservoir o 11111..........1.111111111 Table 5.3 shows the estimated cost, capacity and unit cost associated with each of the reservoir projects that ELCO is currently participating in. The 4,855 acre feet obtained from the three projects falls short of what the District will require by 2030, so other storage projects are being considered. Clear Water Solutions, Inc. East Larimer County Water District 2007 Water Conservation Plan 45