GATE CE 2022: IRRIGATION: 68

While designing a hydraulic structure, the piezometric head at bottom of the floor is computed as 11 m. The datum is 4 m below the floor bottom. The assumed standing water depth above the floor is 2 m. If the specific gravity of the material is 2.5,then floor thickness should be________m.

A siphon spillway of 4 m width and 1 m depth working with a head of 8 m. assuming the coefficient of discharge for the spillway as 0.58 and number of spillways as four then the discharge (m³/s) to be allowed through the siption spillway will be —

The field capacity and permanent wilting point for a given 0.8 m root zone of soil are 35 and 10 percent. At a given time the soil moisture in the given soil is 20 percent when a farmer irrigates the soil with 250 mm depth of water assuming bulk specific gravity of soil as 1.6. Determine the amount of water wasted from the consideration of Irrigation.

The flood discharge under a bridge is 200 m³/s. if the river bed has a deep layer of coarse sand and Lacey’s silt factor F is 1.5. Determine the maximum depth of scour under piers.

An unlined canal under regime conditions along with a silt factor of 1 has a width of flow 71.25 m. Assuming the unlined canal as a wide channel, the corresponding average depth of flow (in m, round off to two decimal places) in the canal will be _____.

Using Khosla’s theory, a weir with a horizontal floor on a permeable foundation having width = 10m, and depth of downstream sheet pile is 1.5m and the difference between upstream and downstream water level is 4m, then the value of exit gradient for a weir is……… (Round of to 2 decimal places)