Scs hydrograph software

Unlimited hydrograph points. Coupled ponds with automatic tailwater. Automatic hydraulics and culvert calculations. Advanced flow simulations including pumps and float valves. Progressive dam breach simulations. Automatic pond storage calculations, including embedded storage chambers. Automatic layout and modeling of underground storage systems. As described in the General Procedure , runoff hydrographs are added to your model by clicking one of the Runoff Hydrograph buttons on the Ribbon Toolbar at the Main Window.

In this case, click the [NRCS] button. After the icon has been added, simply click on its icon or row, depending on which tab you are working from, to populate its input window. Then fill-in-the-blanks for its data and click [Compute]. The chosen prefix will be added to the front of the Name label on the Basin Model and throughout the software, for example, Tables, Charts, Reports, etc. Name Enter any descriptive name for this hydrograph. It will appear on the printed reports as well as the Basin Model.

A table of CNs is available by clicking the Lookup button. Up to six sub-basin areas and corresponding CNs can be entered for a composite CN. Due to the nonlinear character of NRCS hydrograph equations, inaccurate runoff estimates can result when mixing pervious and impervious surfaces within a drainage area using an area-weighted average Curve Number.

This combination can imply a significant initial loss that may not actually take place and will be particularly acute for small rainfalls where the large but incorrect initial loss can be 50 percent or more of the total rainfall, thus underestimating the runoff. For this reason, we highly recommend employing the Weighted Volume method as it is always correct, regardless of the CNs and rainfall amounts.

Here are two hydrographs generated using both methods. HydroCAD provides several key features of TR, such as the unit-hydrograph runoff procedure, in a more user-friendly graphical format. HydroCAD also adds other capabilities that have no equivalent in TR, such as time-of-concentration calculations, curve-number lookup, outlet hydraulics, exfiltration calculations, pond storage calculations, and a range of other features.

See the feature comparison table for details. HydroCAD 8.