8106

• UCREFRP Catalog Number: 8106
• Author: Anderson, R. M.
• Title: Riverine Fish-Flow Investigations.
• USFW Year: 1998.
• USFW - Doc Type: Fort Collins, Colorado.
• Copyright Material: NO

-.. -S.III.& -Tot.. __alii. 8
140,000
120,000
-
G.l ;
G.l
LL 100,000
0 I - ..1- . _ . ... .. ..
0 ' , . - .
0 .....;......-...--~_... I
.... 80,000 I
...
G.l
c..
- 60,000
N
<
t::
-
l'CJ 40,000
~
<(
20,000
0
0 50 100 150 200 250 300 350 400 450 500
Modeled Flow {cfs}

Figure 8. Squawfish-foraging-habitat/Flow relationship (Strata 6 and 8).

The results ofWUNflow relationships for each cluster are given in Table 6. The

inflection points for gross area for the 13 clusters ranged from 40 to 150 cfs and the mean

was 87 cfs. The wetted area for these inflection point flows ranged from 118,000 to

217,000 square feet. The smaller area is a reflection ofa narrower channel, since stream

length is standardized. The mean of the inflection points for daytime habitat is 104 cfs

(Table 6). The area of daytime habitat was very poor in eight clusters (less than 9%

gross), moderate at three (10-19% of gross) and daytime habitat was common at only

three clusters (more than 20%). Colorado squawfish nighttime WUA was more common

and uniform between clusters. The mean of the inflection points for nighttime WUA was

85 cfs (Table 6).

The mean of the inflection points (90, 104, 85 cfs) for gross, daytime and

nighttime habitat (Table 6) was similar to the inflection point found after the data was

averaged (80, 100 and 100 cfs, respectively). The advantage of identifying the inflection

27