Use the widely accepted Rational Method or your own methodology by directly entering peak flows. Specify a minimum allowable watershed time of concentration to prevent high runoff estimates for small catchments.
Rainfall data: Specify equations, tables, or Hydro-35 for Intensity-Duration-Frequency (IDF) data. You can then plot the IDF curves, and reuse your data for other projects in that region.
Watershed hydraulics: Work with an unlimited number of sub-watershed areas and C coefficients for each inlet watershed. Enter external contributing areas, additional flows, and carryover flows to model non-local runoff contributing to the discharge at any inlet.
Velocity and travel time calculation: Choose from several methods for computing travel time, including full pipe velocity, normal velocity, average end velocity and weighted average velocity.