Question

explain the meathods for rainwater harvesting.
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Answer 1

Various methods of rainwater harvesting are described in this section.

Surface runoff harvesting.Rooftop rainwater harvesting.Catchments.Transportation.First Flush.Filter.a) Storage of Direct Use.b) Recharging groundwater aquifers.

Answer 2

Water is, undoubtedly, the top natural resource you need for your home use. It’s glamorous to possess a stockpile of guns, gold, and jeweler, but without water, life might prove to be unbearable.

Methods of Rainwater Harvesting :-

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.

*Components of Rainwater Harvesting

The system mainly constitutes of following sub components:

Catchments
Transportation
First flush
Filter


Catchments

The surface that receives rainfall directly is the catchment of rainwater harvesting system. It may be terrace, courtyard, or paved or unpaved open ground

Transportation

Rainwater from rooftop should be carried through down take water pipes or drains to storage/harvesting system. Water pipes should be UV resistant (ISI HDPE/PVC pipes) of required capacity. Water from sloping roofs could be caught through gutters and down take pipe.

First Flush

First flush is a device used to flush off the water received in first shower. The first shower of rains needs to be flushed-off to avoid contaminating storable/rechargeable water by the probable contaminants of the atmosphere and the catchment roof.

Filter

There is always some skepticism regarding Roof Top Rainwater Harvesting since doubts are raised that rainwater may contaminate groundwater. There is remote possibility of this fear coming true if proper filter mechanism is not adopted.

hope it helps you.....