Direct runoff

Direct Runoff- Water that flows over the ground surface or through the ground directly into streams, rivers, and lakes.

(2) The fair-weather or sustained flow of streams; that part of stream discharge not attributable to direct runoff from precipitation, snowmelt, or a spring. Discharge entering streams channels as effluent from the groundwater reservoir.

basin recharge Rainfall which adds to the residual moisture of the basin in order to help recharge the water deficit. Water absorbed into the soil which does not take the form of direct runoff.
BAT Best available technology.