Evaluation of Instream Flow Methods and Determination

• Year: 1979
• Title: Evaluation of Instream Flow Methods and Determination of Water Quantity Needs for Streams in the State of Colorado
• CWCB Section: Stream & Lake Protection
• Author: R. Barry Nehring
• Description: Evaluation of Instream Flow Methods and Determination of Water Quantity Needs for Streams in the State of Colorado
• Publications - Doc Type: Tech Report

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Table 3-A. Key flow parameters used to determine m1n1mum flow
requirements for the multiple transect R-2 Cross and
IFG4 methods.

Stream Average Average Wetted
wid th depth velocity perimeter a
(ft) (ft) (ft/sec) (%)
Run Habitat Type
1 - 21 0.2 0.5 50
21 - 40 0.2 - 0.4 0.5 50
41 - 60 0.4 - 0.6 0.5 50-60
61 - 100 0.6 - 1.0 0.5 70 or greater
Pool Habitat Type
1 - 20 0.4 0.1 50
2l - 40 0.4 - 0.8 0.1 50
41 - 60 0.8 - 1.2 0.1 50-60
61 - 100 1.2- 2.0 O.l 70 or greater

aWetted perimeter was not part of the computer printout with
the IFG4 and was not used in determining minimum flow recommen-
dations with this method.