Rainwater harvesting Introduction, meaning, techniques, components , advantages and dis advantages, conclusion.

Introduction, meaning of rain water harvesting, techniques, components , advantages and dis advantages of rainwater harvesting and conclusion.

1. Content and pedagogy of physical science
Seminar
Topic : RAINWATER HARVESTING
BENGALURU CITY UNIVERSITY
B.E.S COLLEGE OF EDUCATION
Jayanagar, Bengaluru-11
Presented by:
NANDEESH S
B.Ed II semister
Guided by
J A NARAYAN KUMAR
Asst. Professor
BES Collge of Education

2. sl.no. Content
01 Introduction
02 Rainwater harvesting
03 Techniques of rainwater harvesting
04 Componets of rainwater harvesting
05 Advantages and disadvantages of RWH
06 Rainwater harvesting in INDIA
07 conclusion

3. Introduction
Waterisaprecious,essentialandanabioticcomponentof
theecosystem.weallusewaterfordifferentkindsofdayto
dayactivities,suchascleaning,washing,bathing,drinking
etc.
Rainwaterharvestingisaminiscalewaterresources
projectthatcollect,storesbyrainwaterstructuralmeasures
andregulateandmakeuseofitfordomesticandproduction
use.

4. Rainwater harvesting
Rainwater harvesting is a technology used for collectingand
storing rainwaterfrom 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
Rainwater harvesting is the accumulation and deposition of
rainwater for reuse on-site, rather than allowing it to run
off.

5. RWH is a simple, easy and cost efffective technique of
aggregating water and delivering it to water
resources like borewalls.
Rain water harvesting has the potentioal to
overcome plroblems coused by drought and water
scarcity.

6. Rainwater harvesting

7. Techniques of rainwater
harvesting
Roof top rainwater
harvesting
Surface runoff
rainwater harvesting

8. Surface runoff rainwater harvesting
Surface runoff rainwater harvesting is a method of
collecting rainwater flowing along the ground during
the rains will be collected to a tank below the surface
of the ground for irrigation and other purposes.
During storage of rainwater, it is important to
incorporate efficient and effective water
conservation method.
The main objective of surface runoff rainwater
harvesting method is to meet the ever increasing
demand of water, to reduce water pollution, soil
erosion and flooding of roads.

10. Rooftop rainwater harvesting
Rooftop rainwater harvesting is a method of collecting rain water
where it falls and in which rain water is captured from the roof
catchments of domestic houses or commercial buildings and
stored in the tanks.
This method is simple, eco-friendly, less expensive and truly
effective. Roof-top rainwater harvesting method (RRH) involves
diverting and recharging (or) storing rainwater that falls on the
roof of a house/building.
Residential Houses, Schools, Colleges and other Educational
Institutions, IT Parks, Hotels, Restaurants, Resort, Swimming
pools, Stadiums and many such.

12. Components of Rooftop Rainwater Harvesting
System
Catchments
Coarse Mesh
Gutters
First-flushing
Filter
Conduits
Storage facility
Recharge structures

13. Components of the Rooftop Rainwater Harvesting
1) Catchments-The surface which directly
receives the rainfall and provides water to
the system is called catchment area.
2) Coarse Mesh-It prevents the passage of
debris, provided in the roof.

14. 3)Gutters-Channels which surrounds edge of
a sloping roof to collect and transport
rainwater to the storage tank. Gutters can be
semi -circular or rectangular and mostly
made locally from plain galvanized iron
sheet.
4)First-flushing-A first flush device is a valve
which ensures flushing out of first spell of
rain away from the storage tank that carries a
relatively larger amount of pollutants from
the air and catchment surface.

15. 5) Filter-The filter is used to remove
suspended pollutants from rainwater
collected from roof top water.
6)Conduits-Conduits are pipelines or
drains that carry rainwater from the
catchment or roof top area to the
harvesting system.

16. 7) Storage facility-There are various options
available for the construction of these tanks with
respect to the shape, size, material of construction
and the position of tank and they are: -Shape :
Cylindrical, square and rectangular.
8)Recharge structures-Rainwater Harvested can
also be used for charging the groundwater aquifers
through suitable structures like dugwells, borewells,
recharge trenches and recharge pits.

17. Why do we Harvest Rainwater?
Therainwaterharvestingsystemisoneofthebestmethods
practisedandfollowedtosupporttheconservationofwater.
Today,scarcityofgoodqualitywaterhasbecomeasignificant
causeofconcern.However,rainwater,whichispureandofgood
quality,canbeusedforirrigation,washing,cleaning,bathing,
cookingandalsoforotherlivestockrequirements.

18. Advantagesof Rainwater Harvesting
This an easily accessible renewable water resource.
Rain water harvesting reduces urban flooding.
Rain water harvesting will prevent soil erosion.
Helps in reducing the water bill.
Decreases the demand for water.
Reduces the need forimported water.
Improves the quality and quantity of groundwater.

19. Disadvantages of Rainwater Harvesting
Regularmaintenanceisrequiredrainwaterharvestingsystem.
Requiressometechnicalskillsforinstallation.
Limitedandnorainfallcanlimitthesupplyofrainwater.
Ifnotinstalledcorrectly,itmayattractmosquitoesandother
waterbornediseases.
Oneofthesignificantdrawbacksoftherainwaterharvesting
systemisstoragelimits

20. Now we will see a vedio of rain
water harvesting.

21. Rainwater harvesting in India

24. Programs of rainwater harvesting in India
JALSHAKTIABHIYAN-Waterconservation
campaignwithanemphasison1592
stressedblocksin256districts.
Topromotewaterconservationandwater
resourcemanagement.
Nationalwaterpolicy-2012(policy
advocateswaterconservationandrain
waterharvesting.)
Catchtherain-2022

25. ATALBHUJAL YOJANA-2019
Launchedonthe95thbirth
anniversaryofourformerprime
ministerAtalBihariVajpayee.
To improve the water
management inthoseareas
where theavailabilityof
groundwaterisnotgood.

26. ThefirstIndianstatetomake
rainwaterharvestingcompulsory
forbuildingstoreduce
groundwaterdepletionwasTamil
Naduin2001.
GroundwaterlevelsinChennai
fiveyearshence,rosealmost50
percent,andconsequently,the
qualityofwaterimproved.

28. Established in 1964, BWSSB, in order to provide efficient
water supply services to people.
conceived Cauvery Water Supply Scheme(CWSS)
and implemented the scheme’s I stage in 1972. Three
more stages of schemes were implemented in 1982, 1992,
and 2002.
In 2009, the government of Karnataka made it mandatory
for each and every building/complex in the state.
RAINWATER HARVESTING IN KARNATAKA

29. Sir.M. Vishweshwarayya “Rain Water Harvesting Theme Park”

30. Sir.M. Vishweshwarayya “Rain Water Harvesting Theme Park”
This is 1.2 acre land situated at 40th cross, 8th main, 5th block
Jayanagar Bangalore-41.
In this park there are 26 different type of Rain Water Harvesting
modelsare demonstrated along with the Water conservation tips
at inside and outside the main building
and the first floor the Auditorium is set up with Green Air
conditioning systemand showing the video clip about the RWH to
the Students as well as general public.

32. Vedio of scarcity of water in INDIA

33. Conclusion
Todayweallareheadingtowardthe
scarcityofwater,andthisismainly
becauseofthelackofwaterconsevation
andpollutionofwaterbodies,
urbanization,population.

34. THANK YOU