Silt Controlling Works - Short Questions & Answers

Silt Controlling Works - Short Questions & Answers Points : silt controlling works short questions & answers Q.1: Write down the two method the entry of silt into the canal can be controlled. Ans : The entry of silt into the canal can be controlled by
(1) Providing a divide wall in the river at the canal side so as
(a) to create a trap or pocket.
(b) to create the scouring capacity of under sluices by concentrating the current towards them.
(2) Paving the bottom of the approach channel to reduce disturbance.
(3) Installing a silt excluder.
(4 Making entry of clear top water in the canal by
(a) Providing raised sill in the canal.
(b) lowering sill level of scouring sluices.
(5) Reducing the velocity of water at the intake by providing wider head regulator.
(6) Avoiding unsteady flow by making the entry smooth.
(7) Handling carefully the regulation of weir. Q.2: Write down the name of methods of silt control Ans : There are two types of special works constructed to control the silt entering into the canal;
(1) Silt excluder.
(2) Silt extractor. Q.3: Define the method silt excluder. Ans : Silt excluder is a device by which silt-is excluded from water entering the canal, it is constructed in the bed in front of head regulator. Q.4: Write down the fundamental principle of silt excluder. Ans : The fundamental principle on which a silt control device acts lies in the fact that -in a flowing stream carrying silt in suspension, the concentration of silt charge in the lower layer, is greater than in the upper ones. Q.5: Define the method slit ejector. Ans : A silt extractor or silt ejector is a contrivance by which the silt after it has entered the canal is extracted or thrown out.