(i) The water reservoir is a pond in Figure (a) and underground water body in Figure (b).
(ii) Figure (b) has more advantage than Figure (a) because the advantages of water stored in the ground is more than water stored in a pond. For
example:
(a) It does not evaporate.
(b) It spreads out to recharge wells.
(c) Provides moisture for vegetation over a wide area.
(d) It is protected from contamination by animal and human wastes.
(e) It prevents breeding of insects.
