Which one of the following is the pre-construction measure for silting control in reservoirs?
- AConstruction of check dams
- BRemoval of post-flood water
- CMechanical stirring of the sediment
- DErosion control and soil conservationCorrect
Solution
Concept
Silting control measures
Step-by-step solution
1. Pre-construction (planning) measures: select a site with a low silt yield, treat the catchment (soil conservation, afforestation). 2. Check dams, flushing and removal of silt are measures taken during or after construction.
Explanation
Reducing the silt that reaches the reservoir by controlling erosion in the catchment is a measure that must be started before the reservoir is built.
Why the other options are wrong
Check dams, removal of post-flood water and mechanical stirring are measures during construction or operation.
Shortcut
Before construction: catchment treatment.
Common mistake
Choosing check dams.
Correct answer: D) Erosion control and soil conservation