coal pillar for water preserving

head of water preserving pressure

preserving water and soil

water preserving capability

water preserving mining

economizing water and preserving fertilizers

water temperature preserving pressure

balance between water supply and water demand

brackish water and semi-saline water

brackish water to salt water

conjunctive use surface water and ground water

continuous stress-day index of water logging and excessive soil water

Cooling tower water and condensed water

coupling about surface water and ground water

differentiation of salt water from fresh water

diverting river water for water source supplement

Drinking water and mineral water

Drinking water and source water

Drinking water and water source

industrial circulation water cooling water system