Question

It is important to make small check dams across the flooded gullies because they

• A. (i) and (iv)
• B. (ii) and (iii)
• C. (iii) and (iv)
• D. (ii) and (iv)

Answer 1

The correct option is B

(ii) and (iii)

The correct option is B:

The explanation of the correct option:

1. The construction of check dams is a traditional water harvesting and is inexpensive and installation is easy
2. The main purpose of checking dams is not merely to hold surface water but to recharge the groundwater as they do not hold the water permanently.
3. Check dams simultaneously prevent soil erosion and are used for irrigation because they provide moisture for vegetation.
4. It helps in controlling the velocity of water, conservation of soil, and improving the land.

The explanation of the incorrect option:

Option A:

1. Although check dams help in irrigation but not all check dams hold water permanently.
2. Some dry up within six months or less than six months after monsoons because their main source is rainwater or river

Option C:

1. Although check dams recharge groundwater but not all check dams hold water permanently.
2. The water is stored to fulfill some purpose and those purposes are continuously fulfilled.

Option D:

1. Although check dams hold water and prevent soil erosion, they do not hold the water permanently.
2. Some dry up within six months or less than six months after monsoons.

Final answer: It is important to make small check dams across the flooded gullies because they hold water and prevent soil erosion and recharge groundwater.