Water Resources — Geography STD 10 — Question

(i) Tubewells can irrigate up to 450-500 hectare area whereas a well can irrigate only 1 to 2 hectares.
(ii) Tubewells are more reliable in summer whereas most of the wells dry up in summer.
(iii) Tubewells occupy very small place and hence there is no evaporation of water whereas wells occupy big space and if wells are pen, then lot of water is lost through evaporation.