WSP04343

• File Number: 7630.325
• Description: Wild and Scenic-Gunnison River-Curecanti Unit
• State: CO
• Basin: Gunnison
• Water Division: 4
• Date: 12/1/1986
• Author: WBLA inc
• Title: Gunnison-Curecanti-Curecanti Instream Flow Water Rights Study
• Water Supply Pro - Doc Type: Report/Study

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II S~enario 7: The pattern of irrigation diversions at the Gunnison Tunnel

was fa~tored up in proportion to in~reasing the ~apa~ity of the Tunnel

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from 1122 to 1300 cfs. (See Apper,di x D.)

S~enario 8: The demand pattern for 45,000 a~re feet of M&I releases from

Blue Mesa was ~ompressed to August and September and delivered only in the

80% ex~eedan~e dry years. This pattern pla~es greater demands on Blue

Mesa in the dry years and in the late summer wher, irrigation demands are

high. It also provides less benefit to instream flows, sin~e the entire

45,000 a~re foot supply is delivered in just two months when releases are

often also made for endangered fish.

S~enario 9: The staff of the Colorado Water Conservation Board (CWCBI

provided target levels for Blue Mesa storage whi~h lowered early winter

reservoir ~ontents so as to mitigate the inlet i~e jam problem identified

by the Upper Gunnison Water Conservan~y Distri~t. The CWCB targets were

based on the USBR targets without any adjustment for the Taylor Park

ex~hange. The CWCB targets were a~~ordingly adjusted in the same way as

the USBR targets to a~~ount for the Taylor Park ex~hange and the adjusted

CWCB targets shown in Table 7 were examined in this s~enario.

WBlA, In~. 1909 Broadway, #3, Boulder, Colorado 80302