Currently, about 75% to 80% of conventional water supply is from lakes, rivers and wells. Making the most efficient use of these limited and precious resources is essential. Otherwise, scarcity of water will be faced by our future generations. This includes using appliances and plumbing fixtures that conserve water, not wasting water, and taking advantage of alternative water sources such as greywater reuse and rain water harvesting.
What is Rainwater Harvesting?
Rainwater harvesting may be defined as the technique of collection and storage of rain water at surface or in sub-surface aquifer before it is lost as surface run off. In other words, Rainwater harvesting means to make optimum use of rain water at the place where it falls i.e. conserve it and not allow to drain away and cause floods elsewhere.
Advantages of rainwater harvesting
(a) Promotes adequacy of underground water.
(b) Mitigates the effect of drought.
(c) Reduces soil erosion as surface run-off is reduced.
(d) Decreases load on storm water disposal system.
(e) Reduces flood hazards.
(f) Improves ground water quality / decreases salinity (by dilution).
(g) Prevents ingress of sea water in subsurface aquifers in coastal areas.
(h) Improves ground water table, thus saving energy (to lift water).
(i) The cost of recharging subsurface aquifer is lower than surface reservoirs.
(j) The subsurface aquifer also serves as storage and distribution system.
(k) No land is wasted for storage purpose and no population displacement is involved.
(l) Storing water underground is environment friendly.
Read more about Methods of Rainwater Harvesting.