Instream flow-habitat relationships in the Nueces River Basin Page: 7
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discharges. For all sites, velocity simulations at flow higher than what were measured were reviewed and an
adjustment to the velocity distributions values were made to ensure that unrealistic velocity spikes were not
produced. Velocity spikes can occur in one-dimensional models particularly when extrapolating up from
distributions based on data collected at very low flows. Figure 9 shows some of the WSE and velocity results from
the hydraulic model for cross section 1 at Three Rivers. For this site, data was collected at two flow rates (Q1 = 23
cfs, Q2= 165 cfs) which are highlighted in red and green respectively. In the bottom panel the difference between
the red lines (thick dashed indicate measured values) provide some insight as to the uncertainty that is associated
with this model.
110
Water Surface Elevations108
106
104
102IO0I
100
9820
40
60
Station (ft)-Bed Profile
I- WSE1
S-- WSE2
-1
-5
- 20
- 40
-90
-160
-300
-50080
100
120
Velocity Profiles
5.00
4.50
4.00
3.50
3.00
S2.50
> 2.00
1.50
1.00
0.50
0.00-
020 40 60
Station (ft)80
-- V1
l - V2
-1V
-5 V
-20 V
- 40 V
-90 V
-160V
-300V
500 V100
120
Figure 9 WSE and Velocities predicted by hydraulic model for Cross Section 1 (Riffle) at Three Rivers.
4. Habitat suitability curves.
Available habitat suitability curves were reviewed and modified by the Nueces BBEST biology subcommittee.
Curves were selected for the 8 species for the Edwards Plateau sites (Concan and Laguna) and 13 species for the
South Texas Brush site (Three Rivers) shown in Table 3.
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Trungale Engineering & Science. Instream flow-habitat relationships in the Nueces River Basin, report, June 2011; Austin, Texas. (https://texashistory.unt.edu/ark:/67531/metapth415072/m1/12/: accessed June 21, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.