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Area/Capacity Data: Reservoir gage height and cumulative capacity information are shown in <br />Table 2. Dead storage in Halligan Reservoir is that storage below a gage height of 12.5 <br />feet. The cumulative capacity presented in Table 2 does not include dead storage <br />capacity. <br />Table 2 <br />Halligan Reservoir Elevation-Area-Capacity <br />Gage Height <br />(ft) Area <br />(acres) Cumulative Capacity <br />(ac-ft) <br />15 NAb~ 8 <br />20 NA 56 <br />30 NA 354 <br />40 NA 1,093 <br />50 NA 2,365 <br />60 NA 4,159 <br />69.8 258 6,428 <br />Data. provided by George Varra, District 3 Water <br />Commissioner. <br />bi NA =not available. <br />Enlargement History: Halligan Reservoir has not been enlarged. <br />Reservoir Storage Measurement: Storage levels in Halligan Reservoir are measured using a <br />tape measure secured to a floating bob. The measuring device is located at the dam. The <br />gage is read monthly by a NPIC employee and reported to the Water District 3 Water <br />Commissioner. Evaporative losses are not accounted for on Halligan Reservoir. <br />Diversions through Halligan Reservoir are calculated based on the gage height <br />measurements and measured outflows. <br />Reservoir Seepage Information: NPIC estimates that Halligan Reservoir experiences a <br />seepage loss of 8 to 10 percent. Losses accrue to the North Fork of the Cache la Poudre <br />River. <br />HydroBase Data: The monthly data available in HydroBase over the 1950-2002 period of <br />record pertaining to Halligan Reservoir include the following: <br />End-of--month contents <br />• Complete record (see Figure 2) except for data missing in sporadic water years 1950- <br />1952, 1968-1969, and 1987, and sporadic months over the period of record. <br />NorthPoudreMemo.doc 8 of 29 <br />