public static Hydrograph CalculateSbuh25Year(Catchment catchment)
{
//Define design storms
RainfallEvent rainfallEvent = RainfallEvent.GetScsOneAEvent("Twentyfive-Year", 3.9);
Hydrograph imperviousHydrograph = SantaBarbaraUrbanHydrograph.CalculateHydrograph
(catchment, rainfallEvent);
return imperviousHydrograph;
}