Generation Next: Rain Water Harvesting Workshop
Nelemangala, July 2010
Project Background


HINREN technologies completed construction of RWH facilities at the Higher-Primary Government School on May 25th, 2010. The construction was completed just in time for the school to harvest rain during the monsoon seasons.
RWH Workshop

The workshop was well-attended with a total of five school staff and 30 students participating in the program. Teachers at the Higher-Primary Government School, who had earlier expressed that they knew very little about RWH, found the session to be informative and practical. During the workshop, Mr. Sunil worked out a schedule with students who divided various maintenance responsibilities amongst themselves, such as flushing out stagnant water in the collection pipes, and cleaning the roof once every two weeks an the water sump once every quarter. The main discussion points of the workshop are summarized in the following sections.
Benefits of RWH
Maintenance of RWH
1. Clean the school roof thoroughly one every 15 days.
2. Clean the water tank once in 3 months, and keep the tank closed tight. The water sump should not be exposed to any sunlight or dust, and should be sealed air tight.
4. Change the coal in the filter once in two years, as dust particles can settle on the coal and will eventually contaminate harvested rainwater.
Calculation of Rainwater Collected from the School’s Roof
80*20 = 160 * 20 liters of rainwater per square foot per day of heavy rain.
= 3,200 – 10% of water waste.
= 3,200 – 320
= 2,880 liters
RWH Testing
Features of H2S Strip Test Kit

2. Simplicity: The H2S strip test–kit is so simple to use that anyone can perform its water-quality test. For the reason it is most suited for rural locations where there is inadequate infrastructure and resource persons to conduct a thorough laboratory test.
3. Economical: The H2S strip test–kit is very economical, as it does not require laboratory services and the materials for the test-kit are readily available and cost-effective.
Portability: The H2S strip test–kit is made up of glass, light in weight, and easy to carry anywhere.
4. Disposable: The H2S strip test–kit can be easily disposed after use.
6. Illustrative Direction: The H2S strip test–kit includes easy-to-follow, illustrative directions on how to use the kit.
Mr. Sunil left ten sets of the H2S strip test–kits with the Higher-Primary Government School. This would enable them to regularly test the quality of harvested rainwater to determine if it is suitable for drinking purposes.
How to purify the water?
If the rain water in the H2S glass bottle turns black, the water is not fit for drinking. In such case, take an empty, clean, and transparent plastic bottle and fill it half-way with harvested rain water. Place the plastic bottle on a flat roofing steel sheet, as shown the picture. Leave the bottle under the sun for three to four hours. This will kill any bacteria that are present in the water, and the water will be ready to drink. Alternatively, harvested rainwater can be made potable by boiling the water.