7733

• UCREFRP Catalog Number: 7733
• Author: McAda, C. W.
• Title: Evaluation of Aerial-Video Measurement of Backwaters as Part of the Interagency Standardized Monitoring Program for Age-0 Colorado Squawfish.
• USFW Year: 1993.
• USFW - Doc Type: \
• Copyright Material: NO

Table Al. Correction factor used to adjust total number of Colorado squawfish in unpreserved
samples to compensate for specimens missed in the field, and resultant increase in total fish
used in catch-per-effort calculations.
1989 1990 1991
Reach COR• PCT" COR PCT COR PCT
1 1.004 0.0 1.109 2.7 1.087 0.0
2 1.045 0.0 1.042 0.0 1.000 0.0
3 1.001 0.0 1.000 0.0 1.000 0.0
4 1.024 1.8 1.047 3.6 1.002 0.0
'Correction factor used to compensate for Colorado squawfish that were not identified in the field. Only
used for seine hauls when fish were not preserved for later identification.
"Percent increase in number of Colorado squawfish used in catch-per-effort calculations resulting from use
of the correction factor.
Table A2. Estimated change in backwater area between the beginning of video collection and the
end of ISMP sampling in three monitoring reaches. Change was estimated using regression
equations developed from three years of data (changes were not estimated in Reach 2 because
of a poor relationship).
Beginning of End of
Data Collection Data Collection
Mean-Daily Mean-Daily
Streamflow Streamflow Percent
(CFS) at Predicted (CFS) at Predicted Change in
nearest Backwater nearest Backwater Backwater
Reach Year USGS Gage Area (m2) USGS Gage Area (m2) Area
1 BA Area = (-22347*Flow) + 193264.566
89 3,210 121,531 2,970 126,894 + 4%
90 2,640 134,269 4,140 100,748 -25%
91 5,130 78,624 4,960 82,423 + 5%
3 BA Area= (49.568*Flow) + 172255.678
89 1,340 105,835 1,640 90,964 -1401o
90 1,210 112,278 2,010 72,624 -35%
91
------------------- 2,690
- 38,918 2,650
------------------- 40,900 + 5%
4 BA Area= (-166.745*Flow) + 525053.159
89 1,2b0 314,954 1,540 268,266 -15%
90 1,130 336,631 1,650 249,924 -26%
91 1,970 196,566 1,790 226,580 +15%
26

1

1