Rainwater Harvesting

Er. Prem RanjanRoll No. – 01/SWE/2015

CAEPHT (CAU), Ranipool, East Sikkim

Overviews

Introduction

Reasons of Shortage of Water?

What is the solution?

Why Rain water be harvested?

What is rain water harvesting?

How?

Typical rain water harvesting technics

Rain water harvesting practices in India

Water is our most precious natural resource.

Three fourths of our planet is made of water (97.2% is salt water, and only

2.8% is available as fresh water).

Every year, the water level in the India goes down.

Water crisis is very much in the months of December to June.

There is shortage of water that is either good for drinking or home and

industrial use.

So it is necessary to save every drop of water.

Introduction

Population increase

Industrialization

Urbanization

a) Increase in per capita utilization

b) Less peculation area

In places where rainfed/irrigation based crops are cultivated through ground

water

Decrease in surface area of Lakes, Ponds, Tanks etc.

Reasons of Shortage of Water?

What is the solution?

Rain water is the ultimate source of fresh water

Potential of rain to meet water demand is tremendous

Rain water harvesting helps to overcome water scarcity

To conserve ground water the aquifers must be recharged with rain water

Rain water harvesting is the ultimate answer

Why Rain water be harvested?

To conserve & augment the storage of ground water

To reduce water table depletion

To improve the quality of ground water

To arrest sea water intrusion in coastal areas

To avoid flood & water stagnation in urban areas

Reduces water bills

Reduced water demand - water supply utility saves money

on treatment and pumping

Reduces cost of infrastructure necessary for water supply

The harvesting of rainwater simply involves the collection of water

from surfaces on which rainfalls, and subsequently storing this

water for later use.

or,

Rainwater harvesting is a technique of collection and storage of

rainwater into natural reservoirs or tanks, or the infiltration of

surface water into subsurface aquifers

What is rain water harvesting?

Collect

Store and use

Recharge

How?

The typical rain water harvesting technics

Roof Top Harvesting

Surface Runoff Harvesting

Storage of rainwater on surface for future use.

Recharge to ground water.

Main Objective of these harvesting techniques

Rain water harvesting practices in India

Maharashtra:

1. At present, in Pune, rainwater harvesting is compulsory

for any new housing society to be registered.

2. Mumbai city council is planning to make rainwater

harvesting mandatory for large societies.

Rajasthan:

1. In Rajasthan, rainwater harvesting has traditionally been

practiced by the people of the Thar Desert.

Tamil Nadu:

1. In the state of Tamil Nadu, rainwater harvesting was made

compulsory for every building to avoid groundwater

depletion.

2. Chennai saw a 50 percent rise in water level in five years and

the water quality significantly improved

Karnataka: 1. In Bangalore it is mandatory for adoption of rain water harvesting for

every owner or the occupier of a building having the sital area measuring

60 ft. (18.3 m) X 40 ft. (12.2 m) and above and for newly constructed

building measuring 30 ft. (9.1 m) X 40 ft. (12.2 m) and above dimension.

2. Government has initiated and constructed “Rain Water Harvesting

Theme Park” in the name of Sir. M. Visvesvaraya in 1.2 acres (4,900

m2) land situated at Jayanagar, Bangalore.

3. In this park 26 different type of Rain Water Harvesting models are

demonstrated along with the water conservation tips.

Thank You