9532

• UCREFRP Catalog Number: 9532
• Author: Anderson, R. and G. Stewart.
• Title: Riverine Fish Flow Investigations.
• USFW Year: 2000.
• USFW - Doc Type: Fort Collins.
• Copyright Material: NO

Data points were gathered during the low flow periods by walking, wading, or floating

the channel with a collapsible rod and prism and shooting the position with the total station.

Points were captured at breaks in slope not on transects. Where channel topography varied, a

greater density of points were captured compared to areas with relatively planar surfaces. A

relative measure of channel substrate was recorded for each XYZ data point. Substrate was

determined visually on dry land and on shallow rimes, by feel where water shallow enough to

wade yet too deep to visually estimate, and by tapping with the rod where the water was too '

deep to wade. Channel substrate, feature, and habitat type were communicated by radio to the

total station operator where it was recorded with the total station coordinates using a

HP48GX, with TDS48 software. An effort was made not to shoot any points at a distance of

over 1,000ft asto reduce the amount of measurement error.

Depth and velocity were recorded at a number of cross-sections ~thin each reach to

determine discharge and for use in calibrating the two-dimensional model. Velocities were

determined at 0.6 depth, which was determined to represent average velocity, using a Marsh-

McBirney current meter. A stage (staff gage) marker was installed at each site and

measurements of channel geometry, velocity, and stage were taken at random intervals

through the summer so a stage-discharge relationship could be determined.

,.--j

199915-Mile Reach Survey

During a seven day period beginning June 27th and ending July 7th, 38,880 usable

bathymetric survey points were collected on a 4 kilometer stretch of the IS-Mile reach of the

Colorado River between river miles 174.8 and 177.4 (no data was collected on the 3rd_6th of

July).

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