Explain any two surface water harvesting techniques in detail. Describe the factors impacting choice of water harvesting systems.

Surface water harvesting is the collection and storage of runoff from precipitation and other sources for future use. It plays a crucial role in water conservation, especially in regions with irregular rainfall or where groundwater resources are limited. Below are two common surface water harvesting techniques:

1. Check Dams

A check dam is a small dam built across a stream or river to slow down the flow of water, allowing it to percolate into the ground or be stored for use. Check dams are constructed in areas where the natural flow of water can be diverted or slowed. They are typically made of materials like stone, concrete, or earthen embankments. The water stored in check dams helps recharge groundwater levels, irrigate agricultural lands, and provide water for drinking and other household uses. Check dams are particularly useful in hilly or semi-arid areas where surface water is scarce or where soil erosion is prevalent.

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