Nonpoint Sources Typically Discharge Indirectly to Waterways: Agriculture Hydromodification Urban Runoff Roads, Highways and Bridges Abandoned Mine Drainage Atmospheric Deposition Marinas and Boating Timber Harvest Septic System TRANSPIRATION Wastewater Treatment Plant INFILTRATION Abandoned Mine Drainage Timber Harvest Atmospheric -Deposition | \ / Urban ©^2^1 ^ Runoff ?¦ Roads, Highways ^ ^,^"V-*and Bridges^ Hydro- modification Agriculture Marinas and Boating \ Point Sources Typically Discharge Directly to Waterways: Factory Wastewater Treatment Plant Stormwater Discharge \Hydrologic Cycle: Overland Flow Infiltration Groundwater Flow Transpiration Evaporation Rainfall Aquifer ------- |