16.For the upstream face of an earthen dam, the most adverse condition for stability of slope is

17.Seepage through embankments in an earthen dam is controlled by

18.Presence of tail water in a gravity dam i) increases the principal stress ii) decreases the principal stress iii) increases the shear stress iv) decreases the shear stress The correct answer is

19.The flow of water after spilling over the weir crest in chute spillway and side channel spillway respectively are

20.In a chute spillway, the flow is usually