Solution:
Concept: Rain-water collecting strategy is utilised to capture and store rainwater by making uncommon water gathering structures so that there's an increment within the energise of underground water resources.The taking after is the points of interest in water harvesting:
(i) It diminishes the runoff misfortune of rainwater.
(ii) It helps control floods.
(iii) It manages to preserve a water supply amid the year's dry months.
(iv) It can be used to raise the water table.
(v) It moreover makes a difference in setting a check on soil disintegration.
Hence, the correct answer is option 4.
