This option uses the Graphical Peak Discharge method to compute the peak discharge for up to three different storm data. The following information is required:

• The drainage area in acres (Drainage and Utilities automatically converts it to sq. mi.)
• Amount of pond and swamp areas (percentage of total drainage areas)
• The 24-hr. precipitation (P) for the selected return period
• The appropriate rainfall distribution (Type I, IA, II, or III)
• The time of concentration, Tc
• The runoff curve number, CN