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Last modified
9/26/2011 8:52:20 AM
Creation date
7/10/2008 9:22:14 AM
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Decision Support Systems
Title
SPDSS Task 5 - Key Structure, Water Supply and Storage Company
Description
The Water Supply and Storage 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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Corn 22 <br />Alfalfa 21 <br />Beans 5 <br />Sugar Beets 18 <br />Potatoes 8 <br />Vegetables 8 <br />Other 3 <br />Irrigation practice in the WSSC System has traditionally been flood and furrow irrigation. <br />In recent years, there has been a trend toward more sprinkler irrigation of fields. Farmers <br />using sprinkler irrigation will typically take their pro-rata entitlement of water and <br />temporarily detain the water in an on-site detention pond for use through the sprinkler. A <br />very small fraction of lands under the WSSC System are irrigated with water <br />commingled from the Larimer and Weld Eaton Ditch. <br />Return Flow Locations: Return flows from a portion of the irrigated lands under Larimer and <br />Weld Irrigation District's Poudre Valley Canal and the NPIC System accrue at the <br />Larimer County Canal. The Larimer County Canal also intercepts flows in Dry Creek, <br />Indian Creek, Boxelder Creek, Coalbank Creek, Spring Creek, and Lone Tree Creek. <br />The Pierce Lateral intercepts flows in Black Hollow Creek. <br />Seepage from Larimer County Canal and irrigation return flows accrue to the Larimer <br />and Weld Irrigation District system, the Lake Canal Company system, the New Cache la <br />Poudre Irrigating Company system, the Cache la Poudre River and to a lesser extent, the <br />South Platte River. Drainages that carry return flows from the WSSC System to <br />irrigating systems to the south and eventually to the Cache la Poudre River include Dry <br />Creek, Boxelder Creek, No. 8 Outlet, The Slough, Coalbank Creek, Town Lateral, Mead <br />Lateral, Spring Creek, and Owl Creek. Lone Tree Creek carries irrigation return flow to <br />the South Platte River. <br />Measurement Device: Flow in the Cache la Poudre River is diverted with an overflow <br />diversion dam to the northeast side of the river where a set of gates controls the flow into <br />the Larimer County Canal. Diversions through the Larimer County Canal are measured <br />approximately 1,400 feet down canal from the headgate, through a 32-foot concrete lined <br />rated section equipped with a continuous recorder. The concrete lined section is re-rated <br />annually to ensure accuracy. Along the length of the canal, water is supplied to farms via <br />farm lateral headgates equipped with individual Parshall flumes. <br />HydroBase Data: Daily diversion data for Larimer County Canal are available through <br />HydroBase throughout the 1950 through 2002 SPDSS study period. Between calendar <br />year 1950 and 2002 the average annual diversions through Larimer County Canal were <br />72,113 acre-feet per year. <br />WSSC Plains Reservoir System <br />The WSSC Plains Reservoir System includes approximately 25,713 acre feet storage capacity in <br />the following nine plains reservoirs: <br />WaterSupply&Storage Memo.doc <br />12 of 21 <br />
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