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WSP11633
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Last modified
1/26/2010 3:18:15 PM
Creation date
10/12/2006 5:05:04 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8220.101.09
Description
Glen Canyon Dam/Lake Powell
State
AZ
Basin
Colorado Mainstem
Date
3/1/1994
Title
Comments regarding the Draft Biological Opinion on Operations of Glen Canyon Dam
Water Supply Pro - Doc Type
Biological Opinion
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<br />~ <br /> <br />c. <br /> <br />f: i <br /> <br />i;j; <br /> <br />~ <br /> <br />Fish will have better chance for survival <br /> <br />'.'1 <br /> <br />;:.": <br /> <br />~7. Is there a need for the high spring flow? <br /> <br />a. <br /> <br />b. <br /> <br />c. <br /> <br />I <br /> <br />will keep mouths flooded and young fish in tributary <br />mouths. will reduce temperature effects of mainstem if <br />in mouths of tribs longer <br />Bigger fish should equate to better survival in the <br />mainstem <br />Timing is a que for spawning <br /> <br />~8. Is it possible to measure the contribution to recruitment of <br />LCR population and population as a whole? <br /> <br />a. <br /> <br />b. <br /> <br />otolith studies <br />scale studies <br />Identification of "check" on scale as a mark <br />of movement from warm to cold <br />Low steady summer flows should help to provide stability <br />for young fish <br /> <br />Yes - * <br />* <br />* <br /> <br />" <br /> <br />",' <br /> <br />~<{: <br /> <br />;.'It <br />~~ <br />~ <br />"r~l <br />,(d <br /> <br />~9. Are the releases to provide a specific flow in the river or at <br />the dam? <br /> <br />20. What is the timetable for designing the experiments? <br /> <br />a. Dependent on ROD timetable <br />b. Linked to GCES LT monitoring and research program <br />c. Develop framework within the next year <br />d. Related to MLIS program <br /> <br />Why flows of 9,000 cfs in summer and not 3,000 cfs? Wouldn't <br />lower be better? <br /> <br />a. Mainstem spring area contracted and expanded by flows. <br />b. Most backwaters at 5,000 to 9,000 cfs <br /> <br />Are there other aggregations of HBC in the Grand Canyon that <br />will serve as the second population? <br /> <br />a. Localized aggregations result in localized reproduction <br />b. No one aggregation better positioned to be the second <br />population <br />c. Further removed aggregations (from the LCR) are the most <br />stressed <br /> <br />a. <br />b. <br /> <br />c. <br /> <br />21. <br /> <br />22. <br /> <br />Flows are to be measured at the dam <br />Variability on top of stated releases are ok as they <br />reflect natural conditions <br />Daily fluctuations are bad <br /> <br />k <br /> <br />! ..~" ' <br /> <br />~ <br /> <br />."~. <br /> <br />;,<' <br /> <br />23. Is there a sense of urgency to switch from the interim flows? <br />a. Not enough data to assess interim flows <br />
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