relationships between flow fluctuations and redd dewatering and ...
relationships between flow fluctuations and redd dewatering and ...
relationships between flow fluctuations and redd dewatering and ...
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Figure 5. Str<strong>and</strong>ing areas of juvenile anadromous salmonids for the Lower Yuba River<br />
upstream of Daguerre Point Dam. Substantial juvenile str<strong>and</strong>ing could be avoided by<br />
keeping <strong>flow</strong>s above 3,700 cfs, <strong>between</strong> 2,300 <strong>and</strong> 3,700 cfs, or below 2,300 cfs.<br />
These thresholds are shown as sharp drops in str<strong>and</strong>ing area with declining rearing<br />
<strong>flow</strong>s in the above graph. The red lines give an example of how to read this graph - if<br />
the <strong>flow</strong>s drop from a rearing <strong>flow</strong> of 3,500 cfs to a str<strong>and</strong>ing <strong>flow</strong> of 2,100 cfs, the total<br />
str<strong>and</strong>ing area would be 201,707 ft 2 (18,739 m 2 ). The rearing <strong>flow</strong> is the <strong>flow</strong> prior to a<br />
<strong>flow</strong> reduction, while the str<strong>and</strong>ing <strong>flow</strong> is the <strong>flow</strong> after a <strong>flow</strong> reduction.<br />
USFWS, SFWO, Energy Planning <strong>and</strong> Instream Flow Branch<br />
Yuba River Redd Dewatering <strong>and</strong> Juvenile Str<strong>and</strong>ing Report<br />
September 15, 2010<br />
17
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