WATER HARVESTING

Presented byMD FAIZ ALI13U61A0104

contents Introduction. Concept and Technology. Average Rainfall of States in India. Runoff Coefficients for Various Catchments Surfaces. Rainwater Harvesting System. Treatment Techniques. Materials for Rainwater Tanks. Rainwater Harvesting System at GIET Moinabad.

WHAT IS water harvesting ?

It is the activity of direct collection of rain water .

Water harvesting means capturing rain water, where it falls and capture the runoff from, catchment and streams etc. Generally, water harvesting is direct rainwater collection. This collected water could be stored for later use and recharged into the ground water again.

Rain Water in IndiaTotal annual rainfall in India:

400 million hectare-meters (area x height)

India’s area:329 million hectares

If evenly spread, average height: 1.28m

Average Rainfall in India

Sl.No States Meteorological Divisions A A R (mm)

01Andaman and

Nicobar Andaman and Nicobar Islands 2,967

02Arunachal

Pradesh Arunachal Pradesh 2,782

03 Assam Assam and Meghalaya 2,818

04 Meghalaya Assam and Meghalaya 2,818

05 NagalandNagaland, Manipur, Mizoram an

Tripura 1,881

06 ManipurNagaland, Manipur, Mizoram and

Tripura 1,881

07 MizoramNagaland, Manipur, Mizoram and

Tripura 1,881

08 TripuraNagaland, Manipur, Mizoram and

Tripura 1,881

09West Bengal

Sub-Himalayan West Bengal and Sikkim 2,739

Gangetic West Bengal 1,439

10 SikkimSub-Himalayan West Bengal and

Sikkim 2,739

WHY WATER HARVESTING IS IMPORTANT ?

To conserve & augment the storage of ground water

To reduce water table depletionTo improve the quality of ground water To arrest sea water intrusion in coastal

areas To avoid flood & water stagnation in urban

areas

Techniques of rain water harvestings.

There are two main techniques of rain water harvestings.

Storage of rainwater on surface for future use.

Recharge to ground water.

Rain

RAIN WATER HARVESTING

Roof Top

Filtration

Storage Recharge to ground water

Technology for Rain water Harvesting

Example of Small level Rain Water harvesting in villages in India

Rain Water Distribution & Management

Treatment TechniquesScreening

Methods Location Results

Strainers and Leaf Screens

Gutters and Leaders

Prevent leaves and otherdebris from

Settling Sedimentation

Within Tank Settles particulate matter

FilteringIn-line/Multi-CartridgeActivated CarbonReverse OsmosisMixed MediaSlow Sand

After PumpAt TapAt Tap Separate Tank Separate Tank

Sieves sedimentRemoves chlorineRemoves contaminantsTraps particulate matterTraps particulate matter

DisinfectingBoiling/DistillingChemical TreatmentsUltraviolet Light

Ozonation

Before useWithin tankAfter the activated carbon filter Before Tap

Kills microorganismsKills microorganismsKills microorganismsKills microorganisms

Materials for Rainwater Tanks

Plastic:Plastic Liner: Polyethylene: Metal:

Rainwater Harvesting System at GIET (Moinabad)

THANK YOU