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WSP11632
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Last modified
1/26/2010 3:18:15 PM
Creation date
10/12/2006 5:05:03 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8240.200.40.J
Description
Yampa
State
CO
Basin
Yampa/White
Water Division
6
Date
3/1/1995
Title
Yampa River Basin Recommended Alternative - Detailed Feasibility Study
Water Supply Pro - Doc Type
Publication
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<br />. <br /> <br />. <br /> <br />. <br /> <br />Calibration <br /> <br />The Maybell study site was modeled with a single IFG4 data deck with three <br />sets of velocity and WSL measurements from all six transects (Figure 3). The <br />results of the calibration are presented in Table 9. All of the transects <br />have been assigned a "good" rating with 90 percent calibration. <br /> <br />NUA Predictions <br /> <br />The calibrated data deck was run throu9h the HABTAT4 program for adult <br />Colorado squawfish (size 5; 400+rnrn). The results presented in Table 10 <br />suggest that Colorado squawfish habitat is maximized at 300 cfs. Results are <br />consistent with trends at the Spawning Bar and Replicate study site. <br /> <br />When compared to the historic mean monthly flows of record for the Yampa <br />River, from 1922 to 1986 (Attachment 3), 300 cfs is exceeded 100.0, 93.8, 61.5 <br />and 24.6 percent of the time in June, July, August, and September <br />respectively. <br /> <br />The model predicts that a flow of 300 cfs optimizes WUA for adult Colorado <br />squawfish at 25,4059.74 sq. feet/l000 feet of linear stream, thus, <br />theoretically, a 90 percent habitat retention level could be attained at a <br />range of flows between 200 and 500 cfs. As with the previous two study sites, <br />the model's predictive optima represents a rare historic event in June, July <br />and August and likely would not create optimal biological conditions for <br />Colorado squawfish. <br /> <br />4. GOVERNMENT BRIDGE <br /> <br />The Government Bridge study site, located at RM 97.1 (Figure 4), was surveyed <br />and described by Rose and Brewer in 1985, and 1986. The geomorphic stability <br />of this area has not been considered; however, the stability in the Yampa <br />River between RM's 58 and 88 was evaluated using aerial photographs taken in <br />1954 and 1981. Comparison of these photographs indicate that channel <br />morphology is very stable throughout the Maybell area. Thus, channel <br />stability was assumed (Wahle and Johnson 1984). Andrews (1980) and O'Brien <br />(1987) also concluded that the Yampa River is in long term equilibrium. <br /> <br />Calibration <br /> <br />The water surface profile (WSP) and IFG4 programs were used to model physical <br />habitat at the Government Bridge site (Figure 4). WSP with 3 sets of stage <br />discharge measurements was used to simulate water surface elevations (WSE) for <br />streamflow and survey data collected at eight transects. Initial roughness <br />coefficients at each transect were selected and adjusted so that simulated WSE <br />closely approximated the WSE observations at 1275 cfs (Table 11). Refer to <br />Mi1hous et a1. (1984) and Bovee (1982) for a description of WSP and IFG4. <br /> <br />After the WSE's at each transect were calibrated, WSP was used to simulate <br />WSE's at each transect for a series of flows. The simulated WSE's were <br />transferred to the IFG4 program using WSEI4 so that mean column velocities <br />across each transect could be predicted for each flow. Because only one set <br />of velocity measurements were made at each transect, Manning's equation was <br />used in IFG4 to supply velocities at all verticals for simulated flows. <br /> <br />12 <br />
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