I. ˈ ̷ ̷ˌ ̷ ̷ noun
( -s )
Etymology: draw down
1. : the distance by which the fluid surface level (as in a well or reservoir) is lowered (as by pumping or gate opening)
2. : the curving downward of the water surface near the edge of a weir notch
II. noun
1. : a lowering of the water level (as in a reservoir)
2. : depletion : reduction