While infiltration plays some role in estimating this frequency function, infiltration information itself is not required for the decision making. For example, in a flood-damage reduction study, the hydrologic engineering information required is an annual maximum flow or stage frequency function at an index location. This subsequently will guide selection and application of the methods used. After the decision that is to be made has been identified, the information required to make that decision must be determined. Determine what information is required to make a decision. Instead, the modeling is a source of information that is to be considered in the decision making.Ģ. However, it is seldom the case that the objective of the study is simply to model the watershed or its channels. In other cases, the decision is not as obvious. For example, in a flood-damage reduction planning study, the decision to be taken is what measures, if any, to implement to reduce damage in a watershed. This is perhaps the most difficult step in a modeling study: deciding exactly what decisions are to be taken as a consequence of a study. To use HEC-HMS to develop information required for planning, designing, operating, permitting, and regulating decision making, the following steps should be taken:ġ. However, using HEC-HMS to gain information required for decision making goes far beyond the mouse-clicking and entering data described in that manual. It also describes how to use the HEC-HMS graphical user interface (GUI) to create and manage analysis projects create and manage basin models create and manage meteorologic models create and manage HEC-HMS control specifications create and manage simulation runs calibrate the models and review the results. That manual describes how to install the program on a computer. The HEC-HMS User's Manual (HEC, 2022) provides instructions for developing a hydrologic model using computer program HEC-HMS.
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