Why rain water harvesting is done?

Answer 1

Rain water harvesting refers to the act of ensuring that the rain water gets perculated into the soil rather than flow off.This may be implemented in several ways.The rain water from rooftops get collected and made to flow into a well. Tamil Nadu in India is the first state to implement this scheme in a large scale.

There has been a considerable rise in the water table.
catching rain

Answer 2

Any rainwater harvesting system has three components: Catchment, Conveyance, and Storage. There are two classes of rainwater harvesting systems:

• Systems which collect roof runoff for household use.
• Systems which use in field or adjoining catchment to provide supplemental irrigation for agriculture.

The six basic components of a Rain Water Harvesting system include:

• Catchment: roof surface to collect the rain
• Conveyance: channels or pipes from roof or catchment area to storage
• Roof washing: 'first flush' diverter system to filter and remove contaminants
• Storage: cisterns or tanks where collected rainwater is securely stored - i.e. insect proof
• Purification: includes filtration, ozone or UV light to purify the collected rainwater for potable use
• Distribution: system that delivers the rainwater, usually including a small pump and pressure tank

Rain water harvesting in rural areas :

• Build community wells in a few places in the village. Within 10-20 feet from the well, construct a bore-well using a hand-operated pump. Educate the villagers to keep the area around the well and the bore well clean - no washing (human, cattle, motor cycles, clothing), no defecation.
• If there are existing water tanks in the village, desilt and clean them every 3 years.
• If there are any small rivers or streams, build check-dams across them to hold the rain water for usage after the rains have stopped.
• Take up roof water harvesting

Roof water harvesting rural schools

Rainwater Harvesting (RWH) from roofs is a simple low cost technique that has been practiced for hundreds of years in the desert areas of India. For over two decades, the Barefoot College has provided drinking water in remote rural schools in 15 states for about 32 million people by collecting rainwater from rooftops of the schools and storing it in underground tanks.

In remote villages where access to drinking water is a major problem, RWH structures serves two purposes:

• a source of potable water, especially during the dry season (4- 5 months)
• year-round water provision to improve hygiene, e.g. low-flush public toilets.

The Construction of a RWH system

Before construction of a RWH system, it is necessary to gather information about schools that face shortage of water, existing water resources in the village, roof top area where RWH could be taken up and types of soil in the village.

Answer 3

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. The Main Objective of rooftop rain water harvesting is to make water available for future use. Capturing and storing rain water for use is particularly important in dryland, hilly, urban and coastal areas. In alluvial areas energy saving for 1m. rise in ground water level is around 0.40 kilo watt per hour.

Answer 4

It's used for several purposes such as..... 1. For drinking after filtered. 2. For irrigation. 3. For house hold purposes

Answer 5

collection of water, its storage for later use is called water harvesting

Answer 6

To prevent accumulation of water during flood. Moreover we can use this water for various household activities which saves a great amount of groundwater.

Answer 7

Collecting the rainwater that comes off your roof.