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Last modified
9/26/2011 8:52:20 AM
Creation date
7/9/2008 3:40:23 PM
Metadata
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Decision Support Systems
Title
SPDSS Task 5 - Key Structure, North Poudre Irrigation Company
Description
The North Poudre Irrigation Company has been identified as a key structure for the South Platte Decision Support System (SPDSS) consumptive use and surface water modeling efforts. The purpose of this Task 5 memorandum is to document physical, legal, and operational aspects of those key structures identified.
Decision Support - Doc Type
Task Memorandum
Date
3/5/2005
DSS Category
Surface Water
DSS
South Platte
Basin
South Platte
Contract/PO #
C153954
Grant Type
Non-Reimbursable
Bill Number
SB01-157, HB02-1152, SB03-110, HB04-1221, SB05-084, HB06-1313, SB07-122
Prepared By
Leonard Rice Engineering
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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 />
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