It is important to make small check dams across the flooded guillies because they
i. Hold water for irrigation
ii. Hold water and prevent soil erosion
iii. Recharge ground water
iv. Hold water permanently

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i and ii

ii and iii

iii and iv

i, ii and iii

answer is D.

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Detailed Solution

Concept- A check dam may be a small, occasionally temporary, dam constructed across a swale, ditch, or waterway to counteract erosion by dropping water flow velocity. Check dams themselves don't seem to be a sort of latest technology. Somewhat, they're an ancient technique dating from the second century A.D.
- Check dams are usually, though not always, implemented in a very system of several dams located at regular intervals across the realm of interest. A check dam placed within the ditch, swale, or channel interrupts the flow of water and flattens the gradient of the channel, thus decreasing the rate.
- A gully may be a landform formed by running water, eroding harshly into soil, usually on a hillside. Gullies seem like large ditches or small valleys, but are metres to tens of metres in intensity and width. When the gully formation is in progression, the water flow are often considerable, causing a serious deep cutting action into soil.
- Gullies diminish the productivity of farmland wherever they slit open into the land, and produce sediment that will clog downstream water bodies.
- a serious part of water stored following dams within the world is withdrawn for irrigation, that is, evaporation and transpiration needs. Water utilized in surplus of evaporation and transpiration needs appears within the system as exterior or groundwater.
- The whole quantum of flow and size and frequency of peak floods within the flood season decreases downstream thanks to a dam, reducing flood hazard because of flood of land, crop and property. It also reduces congestion of runoff in plains and coastal lands. Any eating away like gullies by now formed may be tackled by the building of dams or obstructions.
Hence, the correct option is 4.

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