Question

What are the three main requirements for the successful construction of tanks in an area?

Answer 1

For tank irrigation to be successful and practical in any region, it must meet the following three main geological and topographical requirements:

1. Hard, Impermeable Rock Structure: The underlying terrain must be composed of non-porous crystalline rocks, such as granite and gneiss found across the Peninsular Plateau. This hard rocky layer naturally prevents water from percolating or seeping into the earth, ensuring that caught rainwater is safely held on the surface.
2. Natural Undulating Terrain and Depressions: The topography must include rocky hollows, valleys, and undulating slopes. These physical depressions make it simple for farmers to create simple earthen or stone walls (bunds) across the channel of flowing water, resulting in vast reservoirs with little excavation cost.
3. Highly Seasonal or Torrential Rainfall: The area must rely on very seasonal, concentrated monsoon rains rather than year-round perennial rivers. This creates an urgent need to capture and harvest huge amounts of surface runoff during wet months so that it can be used for agriculture throughout the extended dry seasons.