WSP01392

• File Number: 8240.200.10.B
• Description: UCRBRIP - Riverine Fish Flow Investigations
• Basin: Colorado Mainstem
• Date: 6/1/2000
• Author: CDOW
• Title: Riverine Fish Flow Investigations 2000
• Water Supply Pro - Doc Type: Publication

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In the IS-Mile reach study site fish were marked to designate the upper, middle and

lower sections of the site. Also the mark on the IS-Mile Reach indicated on which side of the

river the fish was caught. Eight electrofishing passes were made in this study site. The dates

and the flow (cfs) of the fish sampling were 9/28 (2,060), 9/29 (2,000),9/30 (1,990), 10/5

(1,660), 10/6 (1,420),10/8(1,740) and 10/12 (1,860). To determine if marked fish could be

recaptured upstream, a 4.8 Ian reach was sampled from RM 180.4 to RM 177.4 (upper

terminus of study site) on October 13 and 14. A 4.5 Ian section of river was electro-fished

immediately downstream of the study site (RM 174.9) to RM 172.1 on October IS and 18.

HABITAT MAPPING

The use of two-dimensional flow models requires intensive channel mapping so that

the modeled reach can be accurately represented. The collection of this data can be very time

consuming and may represent a large proportion of the project cost. There are several ways

topographic and flow data can be collected, and several different methods were used in this

study.

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Total Station

In 1998, bathymetry was collected at two locations on the Yampa River using a Pentax

PTSIII total station. A total station gives flexibility to the user and allows them to determine

which survey points are necessary to represent the topography and to only gather data at those

points. Total stations calculate positions using basic trigonometric relationships. The total

station uses a laser beam to determine the distance to a survey prism and simultaneously

measures the horizontal and vertical angles to the prism. Machine accuracy is represented by
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