This set of Irrigation Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Control and Training of Rivers”.
1. Into how many categories the river training works are classified?
Explanation: Based on the purpose of the river training works are undertaken, these works are classified into three categories. They are training for discharge, training for depth, and training for sediment.
2. River training works are undertaken for effective disposal of floods and sediment loads.
Explanation: The main aspect of river training works is to confine the flow to the river channel itself and controlling and regulating the river bed configuration which in turn ensures the safe and effective disposal of floods and sediment load. The first and foremost aim of these works is to stabilize and train the river along a certain alignment.
3. Which category of river training work deals with flood control?
a) Training for Sediment
b) Low Water Training
c) Training for Depth
d) Training for Discharge
Explanation: This work is undertaken for prime purpose of flood control. It aims to provide sufficient cross section for the safe passage maximum flood and makes the adjoining areas flood proof by construction of levees or dykes.
4. Which category of river training work helps in navigation of the channels?
a) Mean Water Training
b) Training for Depth
c) Training for Discharge
d) Training for Sediment
Explanation: This work is primarily undertaken with the aim of providing adequate depth in the navigable channels even in low water periods. This is done by enhancing the flow in the desired channel by closing other channels by the process of bandalling.
5. What is the main aim of mean water training?
a) Effective Disposal of Suspended and Bed Loads
b) To Constant Velocity
c) Flood Control
d) Provide Sufficient Water Depth
Explanation: The aim of mean water training is to provide effective disposal of suspended and bed loads, and thus preserve the channel in good shape.
6. How types of methods are adopted for the training of rivers?
Explanation: Generally seven methods are adopted for training rivers, which includes bank protection. These methods are namely; Levees, Guide Banks, Spurs, Artificial cut-offs, Pitched Islands, Miscellaneous Methods, and Pitching of Banks and provision of launching aprons.
7. How types of groynes are there?
Explanation: Depending upon the material used for the construction of the groynes, they are classified into two types, namely impermeable groynes and permeable groynes.
Explanation: The diagram shows a groyne taken perpendicular to the bank and it only deflecting the flow, and it is much shorter in length than the repelling groyne.
9. Groynes can be used with other training works depending upon the purpose they are used for.
Explanation: Generally groynes are used for purposes like, protecting the bank, contracting a river channel to improve its depth, silting up the area by creating sack flow, and training the river along a certain course. So, therefore a groyne can be used with other training measures depending upon the purposes.
10. Into how many groups groynes are classified according to the function they serve?
Explanation: According to the function they serve, the groynes are classified into four groups, namely attracting groyne, repelling groyne, deflecting groyne, and sedimenting groyne.
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