The dam shown in the figure below is 200 ft long and is made of concrete with a specific gravity of 2.2. Find the magnitude of the net horizontal hydrostatic force (in lb) acting on a dam. The specific weight of water is 62.4 lb/ft. V 60' Headwater 40 -20'- Tailwater 20' A Find the y coordinate of the line of action of the net horizontal force in ft (take y axis directed vertically up, y=0 at the bottom, or the ground; i.e. find the y distance above the ground.).