welcome A SEMINAR PRESENTATION

RAINWATER HARVESTINGON

IMLIMEREN LONGCHAR

SUBMITTED BY

RAIN WATER HARVESTING

WHAT IS HARVESTING?

Harvesting is defined as storing in such a way that it can be used throughout the year.

WHAT IS RAIN WATER HARVESTING?

Rainwater harvesting is the accumulating and storing of rainwater by artificial methods for further utilization.

The principle of collecting and using precipitation from a catchments surface.

Mostly done by rooftop harvesting and is used for domestic and agricultural purposes.

WHY IS THIS REQUIRED?Surface water is inadequate to meet our demand and we

have to depend on ground water.Environmental Changes.To arrest ground water decline and augment ground water

tableTo beneficiate water quality in aquifersTo conserve surface water runoff during monsoonTo reduce soil erosionDue to rapid urbanization, infiltration of rain water into the

sub-soil has decreased drastically and recharging of ground water has diminished etc.

Bangalore gets most of its drinking water from a distance of 95 kms. and a depth of 500 mts.

RAIN WATER HARVESTING TECHNIQUES :

Roof top rainwater harvesting.

Surface runoff harvesting .        

COMPONENTS OF ROOFTOP RWHCATCHMENT

COUNDUITS

FILTERS

STORAGE FACILITY

A first rain separator and a sand filter (First Flush)

EVERY ROOF IN A CITY CAN BE A CATCHMENT

SURFACE RUNOFF HARVESTINGHarvesting of surface runoff

and storage of the same into reservoirs such as water pans makes it available for use when required.

In this method of collecting rainwater for irrigation, water flowing along the ground during the rains will be collected to a tank below the surface of the ground..

USES OF RAINWATER HARVESTING

Domestic Use

Agricultural Use

Industrial and Commercial use

Increase groundwater supplies

Advantages:It provides self-sufficiency to water supply.Rainwater harvesting is less expensive, easy to

construct and easy to maintain. Rainwater Harvesting slows down water flow,

contains potential floodwater and reduces spread of pollution.

 The water is convenient and accessible; valuable time and effort are saved in collecting and/or hauling water.

 It provides a supply of water to meet our future needs.

Disadvantages:Initial cost may be high.Regular Maintenance .Vulnerable water quality.Storage capacity limits.

CONCLUSIONOn of the best way to solve the world burning

facing issue: Water Scarcity.Most useful for large scale applications.Saving of energy per lifting of well and saving of

Water bills.Harvested water can be used for Daily household

needs.The more the business and industries involved =

greater environmental and economic benefits.Rainwater Harvesting saves water, money and

the environment.

Rainwater Harvesting A NOBLE GOAL

A COMMON RESPONSIBILITY

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