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WSP00892
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Last modified
1/26/2010 12:28:21 PM
Creation date
10/11/2006 10:00:12 PM
Metadata
Fields
Template:
Water Supply Protection
File Number
8240.300.03
Description
San Juan River - Recovery Implementation Program - General Info
Basin
San Juan/Dolores
Water Division
7
Date
2/4/1992
Title
San Juan River Seven Year Research Plan (Fiscal Year 1992)
Water Supply Pro - Doc Type
Report/Study
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<br />(0 <br />o <br />c-.:> <br />(I") <br />C') <br />~ <br /> <br />{ <br /> <br />(. <br /> <br />FLOW RECOMMENDATIONS <br /> <br />Reoperation of Navajo dam to mimic a natural hydrograph and provide <br />test flows is an integral part of the proposed research. Test <br />flows during the 7-year study of the San Juan River will allow <br />researchers to determine the best flow regime for preserving and <br />recovering listed fishes. Research flows will be established <br />primarily to test the effect of the magnitude of sprin.g peak flows <br />on spawning, larval production, and habitat (quantity and quality) . <br />In addition, flows will be established for other periods based upon <br />current knowledge of the various life stages of these fishes. <br /> <br />The spring research flows scenarios to be evaluated will be based <br />on historic flow levels. The scenarios to be evaluated include at <br />least one low water year, however, emphasis will be on mimicking a <br />historical hydrograph of normal to high magnitude. Proposed spring <br />release schedules include; <br /> <br />1) During a year when spring peak flows from the Animas <br />River are forecasted to be near normal, Navajo Dam will <br />attain a peak release of approximately 4,500 cfs <br />duplicating both timing and duration of a typical <br />historic hydrograph for the San Juan River during a <br />normal precipitation year. <br /> <br />During a year when spring peak flows from the Animas <br />River are below normal, spring releases from Navajo Dam <br />will be between 500-2,000cfs to mimic a dry year <br />hydrograph. <br /> <br />2) <br /> <br />3) During the remaining 4 years spring releases from Navajo <br />Dam will mimic the Animas River hydrograph in regards to <br />timing and duration. A minimum spring peak of from <br />3,000-4,500 cfs will be provided each year to ensure a <br />relatively high spring flow. <br /> <br />The timing and duration of the spring peak should match that of the <br />Animas River. Releases should be increased to coincide with the <br />beginning of runoff from the Animas River and be periodically <br />stepped up to match the ascending arm of the hydrograph until peak <br />discharge is attained. Likewise, following peak flows releases <br />should be stepped down concurrent with the descending arm of the <br />Animas River hydrograph. <br /> <br />Flows during the summer and autumn will remain low and stable <br />(similar to the natural hydrograph) to maximize nursery areas and <br />other low velocity habitats required by the rare fishes. However, <br />test flows will be required during certain summers to examine <br />formation, quantity, quality, and distribution of backwaters and <br />secondary channels. <br /> <br />7 <br />
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