public static Hydrograph CalculateSbuh5Year(Catchment catchment)
{
//Define design storms
RainfallEvent rainfallEvent = RainfallEvent.GetScsOneAEvent("Five-Year", 2.9);
Hydrograph imperviousHydrograph = SantaBarbaraUrbanHydrograph.CalculateHydrograph
(catchment, rainfallEvent);
return imperviousHydrograph;
}