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SPDSS_Task5_KeyStructure_NewCacheLaPoudre
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SPDSS_Task5_KeyStructure_NewCacheLaPoudre
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Last modified
9/26/2011 8:52:20 AM
Creation date
7/9/2008 3:36:17 PM
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Decision Support Systems
Title
SPDSS Task 5 - Key Structure, New Cache la Poudre Irrigating Company and Cache la Poudre Reservoir Company
Description
The New Cache la Poudre Irrigating Company and Cache la Poudre Reservoir 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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SPDSS_Task5_KeyStructure_NewCacheLaPoudre
Last modified:
9/26/2011 8:52:20 AM
Path:
\Decision Support Systems\DayForward
Comments:
2005 Revision
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OPERATIONAL INFORMATION <br />Operation of the New Cache System is coordinated to optimize the available resources and <br />provide water to stockholders throughout the irrigating season. As a general practice, Timnath <br />Reservoir water is used to supplement direct flow water through Greeley No. 2 Ditch. The <br />general operating strategy in a typical year is as follows: <br />• Reservoir storage begins November 1St and continues throughout the Winter until the <br />reservoir is filled or called out because of a senior priority call. <br />• Irrigating season begins between the 1St and 15th of May and continues until around the <br />10th or 20th of September. <br />• When available, river water diverted through Greeley No. 2 is used in the ditch. River <br />water is typically run from the 2"d week in May through around July lstwhen direct flow <br />water rights are called out due to senior priority calls on the River. <br />• Around July 1St, the River flow drops below the demand for direct flow water by <br />stockholders and the Company will begin delivering reservoir water or operate exchanges <br />as discussed below. <br />The New Cache System is operated as a demand system; water is ordered by and delivered to <br />stockholders when the shareholder requests deliveries. The type of water order a shareholder can <br />place depends on the type of stock ownership (direct flow or storage). <br />Greeley No. 2 Ditch delivers irrigation water to approximately 1001ateral gates along the main <br />ditch, to the North Side Extension gate, and to the North Side Lateral gate. The turnouts, all of <br />which are measured, may serve more than one user or farm and farms may be served by more <br />than one turnout. Most irrigation under the New Cache System occurs downstream of Kern <br />Reservoir. <br />The New Cache System is considered water short by many farmers under the System. Those <br />farmers completely reliant on direct flow water do not believe they have adequate supply of <br />water. Therefore, a majority of farmers under the New Cache System own direct flow shares and <br />reservoir storage shares. <br />Between 1950 and 2000, the average yield per share of New Cache la Poudre Irrigating <br />Company direct flow water ranged from approximately 4 acre-feet per share to 28 acre feet per <br />share for an average yield of approximately 13 acre-feet per share. In calendar year 2004, the <br />quota declaration for Cache la Poudre Reservoir (Timnath Reservoir) shares was 3.0 acre-feet <br />per share. <br />Exchanges and Agreements <br />It is the general practice of the New Cache Company to use water other than share water for <br />exchange purposes. C-BT water is typically exchanged for water in Fossil Creek and Windsor <br />Reservoirs, thereby minimizing the conveyance loss on the delivery of C-BT water. C-BT water <br />is used directly in the New Cache System only when there is no exchange potential. In a <br />separate trade, when Greeley No. 2 is in priority, the Larimer Weld Irrigation Canal can divert <br />water at its headgate in exchange for providing water to the New Cache la Poudre Irrigating <br />Company from Big Windsor Reservoir. Stockholders owning C-BT units are required to inform <br />NewCacheMemo.doc 13 of 14 <br />
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