The Hydrology Module consists of several routines that work together in sequence. This manual only explains the operation of the commands and not hydrology concepts. For example, you will need to know the storm type and soil type for your area. Some routines are based on the TR-55 programs and the TR-55 manual, Urban Hydrology for Small Watersheds, may be useful. The Hydrology Module also links to other hydrology programs including HydroCAD, TR-20, SEDCAD, HEC-RAS and HEC-2. HydroCAD does stormwater modeling. TR-20 is used for hydrograph routing. The SEDCAD links are with capacity files for pond design and by drawing SEDCAD hydrographs. SEDCAD, by Civil Software Design, is used for the computation of flows and sedimentation. The HEC-RAS and HEC-2 programs are prepared by the Corps of Engineers to compute water surface profiles in stream and river channels.

Surface Commands

The pull-down menu for the Surface commands of the Hydrology module is shown here. Most of these commands are also in the Civil Design module and are described in that manual. These Surface commands are included in Hydrology for preparing the surface models to be used in commands such as watershed modeling.