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Parameter Sensitivity in Hydrologic Modeling - page 118 / 163

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discharge is calculated. Next, the drainage area of each sub-basin is varied, and discharge calculated once again for each area variation.

5.2.2.1 HEC-1 Model

Figure 5.10 shows the area delineated by TxDOT for the HEC-1 model. The area in blue is included in the HEC-1 model although it does not pertain to Buttermilk (Area 2). For this analysis, the blue area is deleted from the HEC-1 model.

Figure 5.10: HEC-1 Study Area

The corresponding unmodified HEC-HMS diagram (the HEC-1 model was imported into HEC-HMS) is shown below in Figure 5.11.

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