Following are the main causes:
1. For the need of higher agricultural production for growing population.
2. Due to the uncertainty and irregularity of rain.
3. Nature of rainfall and unequal distribution of rainfall.
4. For the production of agricultural crops in dry area.
5. To encourage intensive agriculture and multicroping system.
6. To increase commercial crop production.
7. More water is needed for hybrid and new crops.
8. To solve the problem of drought. 9. For pasture development.
