7th greade

1. BY:
Azam Khan 7-B
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2. What Is Rainwater Harvesting?
RWH consists of simple systems to collect,
convey, and store rainwater. Rainwater capture is
accomplished primarily from roof-top, surface
runoff, and other surfaces.
RWH either captures stored rainwater for direct
use (irrigation, production, washing, drinking
water, etc.) or is recharged into the local ground
water and is call artificial recharge.
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3. Why Rainwater Harvesting?
Conserve and supplement existing water
resources
Supply water at one of the lowest costs
possible for a supplemental supply source.
Commitment as a corporate citizen -
showcasing environmental concerns
Replenishing local ground water, where
lowering of water tables has occured
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4. Why Not RWH?
 Not applicable in all climate conditions over the
world
 Collected water quality might be affected by
external factors
 Performance seriously affected by climate
fluctuations that sometimes are hard to predict
 Collected rainwater can be degraded with the
inclusion of waste water runoff
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5. Condensation
Let’s take a look at
Precipitation The Water Cycle
Evapotranspiration
Evaporation
Infiltration
Surface Runoff
Consumption Surface Water
Sea water intrusion .ppt (5)

6. Condensation
Average Rainfall
Average Annual and
Precipitation Monthly Precipitation –
Average rainfall over one
year period and monthly
intervals and usually based
on global atmosphere
Consumption
Surface Water
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7. Storage
• Storage devices may be either above or below ground
• Different types include
 Storage Tanks
 Water Containers
 Lagoons or Lined Ponds
Size based on rainfall pattern, demand,
budget and area
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8. Establishing the need in India…
A news
article says
that ground
water levels
in New Delhi
are falling
and RWH
will become
mandatory.
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9. SO AS WE ALL ARE THE HUMAN
BEINGS
AND ITS OUR RESPONSIBILTY TO
SAVE OUR GROUND WATER LEVEL
AND MAKE THEM RECHARGE AT
TIME TO TIME
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10. .ppt (10)