Hydrologic Modeling System (hec-hms):

Many cities have been built along large rivers. The rivers can provide a source of drinking water, act as receiving water for treated effluent, provide navigation for shipping, and other beneficial uses. However, the city must also be protected from flooding due to the close proximity to the river. Hydrologic analysis plays a crucial role in the development of plans for protecting a river city. Typical components of such an analysis include simulation of holding ponds and pump stations adjacent to river levees. Finally, heterogeneous soil conditions may require the use of distributed infiltration calculations.