Environmental Engineering Reference
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Fig. 8.8 Calibrated and
observed total suspended
sediment at EG 8.5
the larger two peaks is 3 percent of the observed. The error in total discharge is 1.5
percent of observed. The hydrograph shapes and base flow are accurately repro-
duced. The GSSHA model was able to adequately simulate hydrology as seen by
the above calibration.
The French's Run study site was located in the headwaters of French Creek
watershed, which is adjacent to and just south of the Upper Eau Galle River basin.
The only defined channels in French's Run were ditches located on either side of
two roads that bisected the watershed. Land use in the watershed was dominated
by corn production during the study period and flows during storm events
occurred as overland runoff from the field that drained directly into the ditches and
a culvert that passed under a road. Runoff was exacerbated by contouring crop
rows parallel to the slope of the field to promote better field drainage (James et al.
2003
). Calibrated and observed flow discharge at French's run gage is given in
Fig.
8.7
.
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