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<br />,_ 1 <br /> <br />In the IS-Mile reach study site fish were marked to designate the upper, middle and <br /> <br />lower sections of the site. Also the mark on the IS-Mile Reach indicated on which side of the <br /> <br />f1 <br />r- ! <br />, , <br /> <br />river the fish was caught. Eight electrofishing passes were made in this study site. The dates <br /> <br />~l <br /> <br />and the flow (cfs) of the fish sampling were 9/28 (2,060), 9/29 (2,000),9/30 (1,990), 10/5 <br />(1,660), 10/6 (1,420), 10/8(1,740) and 10/12 (1,860). To determine if marked fish could be <br /> <br />recaptured upstream, a 4.8 km reach was sampled from RM 180.4 to RM 177.4 (upper <br /> <br />terminus of study site) on October 13 and 14. A 4.5 km section of river was electro-fished <br /> <br />o <br /> <br />immediately downstream of the study site (RM 174.9) to RM 172.1 on October 15 and 18. <br /> <br />n <br />. 1 <br />t,j <br /> <br />HABITAT MAPPING <br /> <br />r.1 <br />I' <br />, I <br />t' . <br /> <br />'!;. <br />The use of two-dimensional flow models requires intensive channel mapping so that <br /> <br />the modeled reach can be accurately represented. The collection of this data can be very time <br /> <br />" <br />Ii <br />u <br /> <br />consuming and may represent a large proportion of the project cost. There are several ways <br /> <br />topographic and flow data can be collected, and several different methods were used in this <br /> <br />~ <br /> <br />study; <br /> <br />L j <br /> <br />Total Station <br /> <br />lil <br />kJ <br /> <br />In .1998, bathymetry was collected at two locations on the Yampa River using a Pentax <br /> <br />Ii <br />tJ <br /> <br />PTsm total station. A total station gives flexibility to the user and allows them to determine <br /> <br />which survey points are necessary to represent the topography and to only gather data at those <br /> <br />points. Total stations calculate positions using basic trigonometric relatiJnships. The total <br /> <br />L.....:..~j <br />tJ <br /> <br />station uses a laser beam to determine the distance to a survey prism and simultaneously <br /> <br />r-" <br />;' -1 <br />; -:-1 <br />[, <br /> <br />measures the horizontal and vertical angles to the prism. Machine accuracy is represented by <br /> <br />13 <br />