7926

• UCREFRP Catalog Number: 7926
• Author: Annear, T. C. and A. L. Conder.
• Title: Relative Bias of Several Fisheries Instream Flow Methods.
• USFW Year: n.d.
• USFW - Doc Type: Cheyenne, Wyoming.
• Copyright Material: NO

Nehring (1979) describes a method used by the Colorado Division of Wildlife

Habitat Retention

where ins tream flow recoll1Inenda tions are based on re tention of hydraulic charac'"

teristics in various habitat types (Table 3). These criteria consist of average

depth, average velocity, and wetted perimeter.

Ins tream flow recommendations

are selected when established values for two or more criteria are met for the

appropriate stream size and habitat type.

The same lFG-l program was used to

'~

obtain these data as was described for the wetted perimeter methods. a~~ per-

mutations of these criteria were used to define MF recommendations in this study

(Table 1).

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Physical Habitat Simulation (PHABSlM) Models

Hydraulic data were collected for lFG-4 and Water Surface Profile (WSP or

IFG-2) models according to established guidelines (Bovee and Milhous 1978).

Habitat suitability criteria curves developed by Bovee and Cochnaur (1977) were

used for all calculations except for adult Yellowstone cutthroat trout (Salmo

clarki bouvieri) (Behnke 1979).

The Bovee and Cochnaur curves were developed
I

from a general data base which doubtless results in some insensitivity. These

curves were used because (1) the majority of PHABSIM users have, at least in the

past, used these and (2) time constraints prevented us from developing our own

curves.

The adult Yellowstone cutthroat trout curves were prepared by Wyoming

Game and Fish Department biologists and Ken Bovee of the U.S. Fish and Wildlife

Service's Cooperative Instream Flow Service Group (IFG).

Results generated by these models a~e in terms of weighted usable area (WUA)

up to five life stages per species over a specified range of flows. For

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