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

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0.5
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Table 3. Key flow parameters used to determine minimum flow
habitat retention.a

Stream Average Average
wid th depth velocity
( ft) ( ft) (ft/sec)
Riffle Habitat Type
1 - 20 0.2 or greater 1.0 SO
21 - 40 0.2 - 0.4 1.0 SO
41 - 60 0.4 - 0.6 1.0 50 to 60
61 - 100 0.6 - 1.0 1.0 70~or

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I
II

Rivers in excess of 100 feet i'~:~ett:e~~~rimeter are .judged on individual
',:- .: ' Ii
channel characteristics as rel~tedt()ke flow parameters. Parameters apply
to instream flowre'commendatioj.)s. f~r:th!!: period of May. to September. October
to April flow recommendations;~~ill>b~:.~t' the same level or at the' natural
undepleted flow, whichever Ls.!;;;1e.ss.. ",!.f,~....;.:,.'.
rd':Mi1~ "'", ",,~,.t","q:-,
''''_:'~'i., ".._'~.'jf-'~,;L ~',I
....';r.........1...::
Instream flow recommendation8i':i:~c:h'.:i~~~J selected when minimum levels of two
or more param:ter~ are reacbe~~~tMe\~~'. designated stream clas~~ Average
dept~ evalu~t1on 1S based on,,~x1tnumtbo4r depth of the largest hsh prese~t
and 1S cons1dered one. of the. i]lOs I: JmpoJ:'t4,nt flow parameters. Body depth 1S
defined as the. distanc;e from;~he;,tip.o~~Jhe extended dorsal fin to the lowest
portion of the body cavity... ...........~....:.i~.~.;:;.;.:.'.)':::;: I." 'lJ:..'.;.'.,./.J

'A~. ...................f
,: :':' :~1f r J'
i'/'~.l
.lit.}
.., !
1
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:it
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~~

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Run Habitat Type

1 - 20
21 - 40
41 - 60
61 - 100

0.2 or greater
0.2 - 0.4
0.4 - 0.6
0.6 - 1.0

Pool Habitat

1 - 20
21 - 40
41 60
61 - 100

0.4
0.4
0.8
1.2-

or greater
- 0.8
1.2
2.0

,~~~.

a -

50
50
SO to
70 or

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SOfH
50 j'
50'.to
70:ot

0.1
0.1
0.1
0.1

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