8251 - Laserfiche WebLink

Home Browse Search

Draft Fmal Completion Report [0 UDWR for Contract #93-1070, Amendment 3 data were recorded on standard data sheets, and the location and extent of habitat marked on the video prints. 29 Integration of UDWR Nursery Habitat Sampling UDWR provided data sheets from all nursery habitat sampling trips made between 1992 and 1994. Marked video prints were provided for the 1993 and 1994 trips. Data sheets included information on the physical setting (for example, depth, width, and location) and numbers of identified Colorado squawfish found. Most of the sampled fishes were too small for field identification. so these samples were sent to the Colorado State University Larval Fish uboratory for later identification. These UDWR data were used as follows. First, sampled habitat was delimited and geomorphically classified on the video prints taken at a similar time near the UDWR sampling date; the difference in time between video prints and sampling was typically less than 4 to 6 days in 1994, and less than 3 days in 1992 and 1993. Second, the maximum depth of the sampled backwater was used to classify each backwater as deep (> 0.5 m) or shallow (< 0.5 m). Lastly, the presence or absence of Colorado squawfish as noted by UDWR personnel for each backwater was included in the GIS database. A 5 character code for the delineated habitats was used to describe the sampled habitat's geomorphic setting, its depth classification. and the presence or absence of squawfish . A geomorphic coding scheme was also developed. The geomorphic coding was the first 3 characters of the 5 character attribute; a fust letter of "b" indicated that the habitat was associated with a bank-attached compound bar and an ''m'' indicated a mid-channel bar. Horseshoe vortices (hsv) were scour holes associated with the upstream end of stabilized deposits, and isolated pools (ip) were most often associated with bank-attached bar secondary channels or horseshoe vortices separated from the main channel by sand deposits. Isolated pools were not sampled by UDWR personnel. The geomorphic codes are summarized in Table 5 below and illustrated in Figure 14. The fourth letter of the code was a "d" or "s" indicating if depths greater or less than 0.5 meters were measured by UDWR personnel. the fifth letter, "p" or un" indicated if Colorado squawfish were observed by UDWR personnel. The latter can be updated when final results from the Colorado State University Larval Fish Laboratory are received but this revision is beyond the scope of this thesis. The statistics generated from the GIS included the total area of habitat and total area of deep and shallow habitats.