A barrage of 100 meters long if all of the water pressure was 7.2 x 107 Newton said that the water level above the dam to dam it up to get it. (The density of water is 103 kg / m3, and f = 10 m / s2).
One of the 100 meters long dyke If you can get all the pressure of the water 7.2 x 107 Newton. And find out how much water over the dam top dam is to accept it. (the density of water.103 kg and / m3 f = 10 m / S2).