This document discusses rainwater harvesting as a solution to water scarcity. It defines rainwater harvesting as collecting and storing rainwater from catchment surfaces like rooftops. Rainwater harvesting helps raise groundwater levels and reduces soil erosion and flooding. It is a low-cost way to supplement water needs that is effective if implemented properly. The document also provides details on techniques like rooftop and surface runoff harvesting. It analyzes rainwater harvesting potential at the SVNIT campus, finding it could collect over 173,000 cubic meters of water in 30 days. In summary, rainwater harvesting is presented as an important way to help solve water scarcity issues through sustainable use of rainfall.

1. By : MITESH PATEL
(U10CE046)
Mentor: Shri Ravin tailor
Assistant Professor
CED, SVNIT

2. Introduction
 The total amount of water on earth remains
constant. The rapid growth in population
together with the extension of irrigated
agriculture and industrial development, are
putting stress on the natural ecosystems. In
the face of growing problems, society has
begun to realize that it can no longer
subscribe to a use and discard philosophy
with any natural resource. One such resource
is WATER. To deal with it, a technique
called RAIN WATER HARVESTING was
introduced where rain water is used to meet
some of our daily needs.

3. What is Rainwater Harvesting
 Rainwater
harvesting is the accumulating and
storing, of rainwater. It has been used to
provide drinking water, water for livestock, water for
irrigation or to refill aquifers in a process
called ground water recharge.
 The principle of collecting and using precipitation
from a catchments surface.
 Rain water harvesting means to make optimum use of
rain water at the place where it falls i.e. conserve it and
not allow draining away and causing floods elsewhere.

4. Need of Rainwater Harvesting
 Water is becoming scarce.
 Surface water is inadequate to meet
our demand.
 We have to depend on ground water.
 To reduce soil erosion.
 Groundwater is getting depleted and
polluted.
 Improves the ground water quality.
 Increasing population of India.
 Of the total water on earth, only 3%
constitutes freshwater. Rest is saline
water in the oceans.
 11% of the total fresh water on earth
is groundwater available up to a depth
of 800m which can be extracted for
use

5. Rainwater Harvesting Techniques
Roof top rainwater harvesting.
Surface runoff harvesting .

6. Roof Top Rain Water Harvesting
 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 ground water level of the area.

7. How to Harvest Rainwater
 Collect water from the rooftop.
 Draw it down from pipes.
 Filter the water.
 Store in a sump or tank for later use.
 Charge the groundwater through a soak pit.
 Lead the water into a well to increase ground water content.

8. Elements of Rooftop Rainwater
Harvesting
 CATCHMENT
 CONDUITS
 FILTERS
 STORAGE
FACILITY

9. SURFACE RUNOFF HARVESTING
 Harvesting 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,waterflowing
along
the
ground
during the rains will be
collected to a tank
below the surface of the
ground.

10. Advantages of RWH
 RWH is the ideal solution for
all water requirements.
 Increase in ground water level.
 Reduces flooding of roads .
 Reduced soil erosion.
 Improves the ground water
quality.
 Low cost and easy to maintain.
 Reduces water and electricity
bills

11. Disadvantages of RWH
 Seasonal nature and uncertainty of rainwater supply
depending on the region in the world.
 Capital costs .
 Regular maintenance and cleaning is essential for
successful operation.

12. Study Area:-SVNIT Campus
 Total roof top area = 1,29,655.77 m2
 daily amount of water to be
Collect:- 5186.23 m3
 No of bores need for harvesting:-208
 Amount of water to be collect in 30 days:-173586.9m3

13. Summary
 On of the best way to solve the world burning facing issue:





Water Scarcity.
Helps in Raising Ground water level.
Harvested water can be used for Daily household needs.
It is economical.
Its not a permanent solution as water is not available
throughout the year but it can be utilized to its maximum
extent.
Water is an important resource we should be very careful
while dealing with it.

14. Rain Water Harvesting
Noble Goal

15. THANKYOU