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Hydrographs & Sedimentgraphs

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The SEDCAD user divides the watershed site into relatively homogeneous subwatersheds with respect to expected hydrologic and/or sedimentologic response. The subwatersheds are linked with structures, and the structures are linked in a nodal fashion in the networking section.

Hydrographs

Hydrographs are developed for a design storm for each subwatershed with the input of area, time of concentration, SCS (NRCS) curve number, and a unit hydrograph response shape.  Routing of hydrographs is accomplished by the Muskingum method.

Sedimentgraphs

Similarly, a sedimentgraph is developed for each subwatershed using an input eroded particle size distribution, soil erodibility K factor, representative slope length, representative slope, type of soil cover, and control practices.

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Last modified: 09/12/07.