What
is the difference between surface runoff harvesting and rooftop?
Answers
Answer:
1. Surface runoff harvesting
In urban area rainwater flows away as surface runoff. This runoff could be caught and used for recharging aquifers by adopting appropriate methods.
2. Rooftop rainwater harvesting
It is a system of catching rainwater where it falls. In rooftop harvesting, the roof becomes the catchments, and the rainwater is collected from the roof of the house/building. It can either be stored in a tank or diverted to artificial recharge system. This method is less expensive and very effective and if implemented properly helps in augmenting the groundwater level of the area.
Answer:
Surface runoff harvesting:-
Rooftop and paved surface rainwater harvesting is not enough for whole year. So it is very necessary to introduce the artificial recharge methods of rainwater harvesting. In this method the rainwater is accumulated in a small constricted area like pits, wells, trenches, shafts etc. and infiltrated under the soil through them. This is the indirect method of rainwater harvesting so there is no direct gain but in long-term this is the best method of making water available sufficient under the ground. This method of rainwater harvesting is also called recharging ground water aquifer.
Roof top Rainwater harvesting:-
Rooftop Rain Water Harvesting is the technique through which rain water is captured from the roof catchments and stored in reservoirs. Harvested rain water can be stored in sub-surface ground water reservoir by adopting artificial recharge techniques to meet the household needs through storage in tanks.
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