Question

Check dams are constructed in association with main dam in the

• A. upstream of the main dam to check the siltation of the reservoir
• B. downstream of the main dam to check the siltation of the reservoir
• C. upstream of the main dam to check the seepage from the reservoir
• D. downstream of the main dam to check the seepage from the reservoir

Hint:

Check dams play a vital role in preventing sediment accumulation in reservoirs by reducing the siltation coming from upstream sources.

Answer 1

The Correct Option is A

Step 1: Understanding the question.
Check dams are smaller structures built in association with main dams to control water flow and reduce the siltation in reservoirs. The correct location for their construction is critical to their function.
Step 2: Analyzing the options.
(A) upstream of the main dam to check the siltation of the reservoir: Correct — Check dams are often constructed upstream to control the flow and reduce the amount of silt entering the reservoir.
(B) downstream of the main dam to check the siltation of the reservoir: Incorrect — Siltation occurs before the water reaches the main reservoir, so a check dam downstream would not be effective in reducing siltation.
(C) upstream of the main dam to check the seepage from the reservoir: Incorrect — Check dams upstream are typically used to prevent siltation, not to manage seepage.
(D) downstream of the main dam to check the seepage from the reservoir: Incorrect — Check dams help with controlling water flow and siltation, not seepage.
Step 3: Conclusion.
The correct answer is (A) upstream of the main dam to check the siltation of the reservoir, as it is the most effective placement for reducing siltation.