KARAVALI INSTITUTE OF TECHNOLOGY ,
NEERUMARGA , MANGLORE .
SOCIAL CONNECT AND RESPONSIBILY
ACTIVITY REPORT
TOPIC :- RAINWATER HARVESTING
SUBMITTED BY:-
TEAM :- 1. LEYAROSE.N
2. SONA.N
3. VIKAS.R
4. VARUN.R.K SUBMITTED TO :-
MS.BHAGYASHREE
DEPARTMENT OF MBA
SL.NO CONTEXT PAGE.NO
1. INTRODUCTION 3
2. OBJECTIVES 4
3. RAIN WATER HARVESTING AND ITS METHODS 5
4. REPORT IN DETAIL 6
5. CONCLUSION 7
INTODUCTION :-
What is rain water harvesting?
• The harvesting of rain water simply involves the collection of water from surfaces on
which rain falls , and subsequently storing this water for later use . Normally water is
collected from the roofs of buildings and stored in rainwater tanks.
• It is the accumulation and deposition of rainwater for reuse on site .
• The harvested water can also be used as drinking water , long term storage and for other
purposes such as ground water recharge .
OBJECTIVES :-
• To determine the rainfall characteristics of the area.
• To calculate the rainfall discharge.
• To find the rainwater potential and its relation with ground water.
• Giving awareness about rainwater harvesting in the society.
RAINWATER HARVESTINGS AND ITS
METHODS:-
Rainwater harvesting is a technology used for
collecting and storing rainwater from rooftops, the
land surface or rock catchments using simple
techniques such as jars and pots as well as more
complex techniques such as underground check
dams. The techniques usually found in Asia and
Africa arise from practices employed by ancient
civilizations within these regions and still serve as a
major source of drinking water supply in rural areas. Commonly used systems are constructed
of three principal components; namely, the catchment area, the collection device, and the
conveyance system.
There are basically two methods of Harvesting Rainwater.
1. Surface runoff harvesting
2. Roof top rainwater harvesting
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.
Rooftop rainwater harvesting:-
It is a system of catchingrainwater 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.
REPORT ON RAINWATER HARVESTING
We did a survey on rainwater harvesting we gave awareness about how to save water for the
future generations also need the water .
Rainwater harvesting is a simple , economical and eco-friendly technique of preserving every
drop of water by guiding the rain water to fall in borewells , pits and wells through small
diameter pipes .
IMPORTANCE OF RAIN WATER HARVESTING
• Inadequate surface water to meet our rising demand .
• Excessive dependence on limited ground water .
SOME TECHNIQUES OF RAINWATER HARVESTING
• RECHARGE PIT :- They are constructed for recharging a shallow aquifier . These are
constructed 1-2 m wide and upto 3 m deep.
• RUNNING HANDPUMP :- The existing hand pumps may be used for recharging the
shallow aquifiers .
• RECHARGE TRENCH :- The design of a recharge trench is similar to that of a settle
tank . Its capacity is less then its gross volume .
• DUG WELLS :- Existing dug wells may be utilized recharge structure and water should
pass through a filter pit .
CONCLUSION :-
The growing population and the rising demand for water have put a great deal of pressure on
the natural resources. Underground water is depleting at a very fast rate and soon there will be
shortage and scarcity of water all over the globe. If artificial methods are adopted then this
problem can be solved. Rainwater harvesting will not only ensure flood control but it has other
benefits like ensuring a continues supply of water, pollution control ete. As per the discharge
calculations for various intensities of floods we can conclude that rainwater in itself is not
capable of augmenting the groundwater water table. So, we need to employ rainwater
harvesting structures. The effectiveness of rainwater harvesting system lies in its ability to meet
the site requirements and end use preferences. Though simple, these systems are site specific
and need to be detailed out before implementation. With decrease in availability of water,
rainwater harvesting presents the best option for times to come. Recently, the interest in RWH
systems as an alternative water source has increased, due to their economic and environmental
advantages. Indeed, these systems can provide a supplementary water supply in urban areas
when integrated with an existing conventional water supply system, or the main water supply
in rural areas affected by water scarcity. In the context of climate change, the installation of
RWH tanks could represent a valuable adaptation measure against the reduction of water
availability.
