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Area/Capacity Data: Reservoir gage height and cumulative capacity information are shown in <br />Table 1. The capacity data presented in Table 1 do not include the 685 acre-feet dead <br />storage. <br />Table 1 <br />Long Draw Reservoir <br />Gage Height -Area -Capacity <br />Gage Height <br />(ft) Area <br />(acres) Cumulative <br />Capacity (ac-ft) <br />10 NA 1,295 <br />20 NA 3,341 <br />30 NA 5,810 <br />40 NA 8,854 <br />45.2 340 10,625 <br />Data acquired from Water District 3 Water <br />Commissioner. <br />bi NA =not available. <br />Measurement Device: Storage levels in Long Draw Reservoir are measured using a staff gage, <br />which is read daily in the summer and monthly in the winter by a WSSC employee and <br />reported to the District 3 Water Commissioner. Reservoir releases are calculated based <br />on inflows measured through the Grand River Ditch Parshall flume located at La Poudre <br />Pass and the reservoir water level gage. During the winter, access to the reservoir and <br />staff gage is limited due to heavy snow conditions. Evaporative losses are not charged to <br />Long Draw Reservoir. <br />Reservoir Seepage Information: No known studies have been conducted to quantify seepage <br />losses from Long Draw Reservoir. <br />HydroBase Data: Historical end-of--month storage records are available for Long Draw <br />Reservoir in HydroBase under Structure ID 0303726 for most of the 1950 through 2002 <br />SPDSS study period. Diversion records <br />for inflow to and releases from Long Draw <br />Reservoir are available in HydroBase <br />under the same Structure ID for 1973 <br />through 2002. <br />Review of the historical end-of--month <br />storage records, as shown on Figure 3, <br />show the 1974 reservoir enlargement of <br />6,600 acre-feet. The annual pattern <br />exhibited in the end-of--month reservoir <br />storage reflects the typical operating La Poudre Pass creek <br />schedule for Long Draw Reservoir. <br />Reservoir storage reaches a maximum each year between May and July, during the period <br />when transmountain water is being stored. Reservoir levels drop during the late part of <br />the irrigation season, between July and October, when water is being delivered to <br />WaterSupply&Storage Memo.doc <br />6 of 21 <br />