why tank irrigation are facing many problem
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Answer:
There are as many obstacles to tank irrigation as there are benefits, due to their large number and the differences in water demand, managerial experiences, and investment needs for maintenance. During low-rainfall years, the tanks would store small quantities of water, and the chain of tanks, except the first tank, would receive little supply. Using 40 years rainfall data, it was estimated that in 5 out of 10 years the tanks will be experiencing deficient supply; in 3 years the tanks will fail; in 1 year the tanks will have surplus storage, and in 1 year the tanks will be getting full supply. The effect of the same would be more profound in non-system tanks resulting in a reduction in irrigated area over the years. Since 90% of the tanks are non-system tanks, the effect on area reduction would be more significant. Besides rainfall variation and tank filling, other factors such as siltation, encroachment, channel
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