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Last modified
1/26/2010 12:53:19 PM
Creation date
10/12/2006 12:05:14 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8062
Description
Federal Reserved Water Rights
State
CO
Basin
Statewide
Date
9/1/1979
Author
R Barry Nehring
Title
Evaluation of Instream Flow Methods and Determination of Water Quantity Needs for Streams in the State of Colorado - September 1979
Water Supply Pro - Doc Type
Report/Study
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<br />UJJ13~ <br /> <br />9 <br /> <br />Electroshocking sections were from 500 to 1,000 feet of stream <br />channel and contained at least two complete cycles of stream habitat, <br />,i.e., riffle-pool-riffle being one cycle. No attempt was made to <br />prevent movement of fish into or out of the area during electroshock- <br />ing. However, in two study sections shocking runs were made both <br />above and below the study areas to evaluate the movement of marked <br />fish out of the population estimation area. In one stream. no marked <br />fish moved out and in the other only one marked trout of more than <br />200 captures had moved out of the study area, or less than 0.5%. <br />Timmermans (1974) found this to be the case as well and concluded <br />that screening of study areas was a superfluous exercise. <br /> <br />Trout captured on the first pass were marked by punching a <br />2 mm diameter hole in the caudal fin with a hand-operated paper <br />punch. The hole heals up in 2 to 4 weeks and does not hinder the <br />fish's swimming ability. Biometric data (length, weight, species, <br />and scale samples) were collected after the second electroshocking <br />and all fish were checked for marks. Only fish in excess of 13 cm <br />in length were considered in the population estimation process. <br />Data from the e1ectroshocking surveys are summarized in Appendix A. <br /> <br />Instream Flow Service Group - Special Analysis Procedures <br /> <br />The IFSG prepared guidelines of suggested analysis procedures <br />to be included as part of the final report. These analyses are <br />presented in the appendix. The IFSG recommended method of stream <br />by stream time and cost analysis is presented in Appendix D. <br />Appendix E contains a brief curriculum vitae of all participants <br />in this study and a stream by stream list of the functions the <br />various individuals performed on the streams. Appendix F is a <br />list of species occurring in each of the study areas as well as <br />the target species. <br />
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