Barrage – method of protecting mines, pits and quarries from subsurface water by way of complete or partial fencing of excavation areas with waterproof devices. Within such waterproof fenced area the level of subsurface water goes down due to pumping out or drainage. Around the fenced area the water level remains close to natural or is a bit higher due to the booster effect.

Barrage helps to protect subsurface water resources, decreases dewatering costs (pumping out strategic water reserves within the protected contour).