Rainwater collection for our water woes

November 23, 2017 09:34 AM Nasana Bajracharya


KATHMANDU, Nov 23: Nepal is the second richest country in the world in water resources. 
This is a statement that most of the Nepali people know by heart. And yet,most of them don't know where the water is. 

Drinking water is a scarce commodity, even for the residents of Kathmandu Metropolis. Not everybody has access to water that is supplied through the government pipes. They have to spend thousands of Rupees each month in buying water from private tankers, and wait forever for the ‘Melamchi dream’ to come true. In rural areas of the country, the situation is worse. People have to travel miles to fetch a bucket of water. 

But there is a glimmer of hope – in rainwater harvesting. We often see people in water-scarce areas collecting rainwater in buckets outside their houses, which they use for cleaning and washing purposes. And if used properly at a larger scale, rainwater can be a huge help to address our water woes. 

The simple and affordable technology of rainwater harvesting has been put to use in various countries around the world as a way out from water scarcity.

There are various organizations working in this regard across the globe. We also have one of such organizations in Nepal, an NGO named Guthi, which is working in the field of rainwater harvesting.
Guthi, in coordination with International Rainwater Harvesting Alliance (IRHA), State of Canton, City of Canton, and City of Meyrin, is running a campaign named ‘Rain Community’. The campaign includes awareness sessions, trainings, and setting up of rainwater harvest systems. The organization recently held three-day-long awareness campaign in two public schools of the Kathmandu valley.

“Through the campaign, on the first day we reached out to a total of 903 students of grade 1 to 10 from Viswa Niketan Secondary School, Teku. We divided the kids into different groups and involved them in small group projects about rainwater harvest. We held a speech competition for the students to talk about the importance of rainwater harvesting, sanitation and importance of toilet.

On the second day, we inaugurated a new RWH system in Ganesh Bhukampa Panarsthapana Kendra at Liwali, Bhaktapur. And on the third day we visited Jana Prabhat School, Kalimati,for a program similar to that of VNSS,” said Bimala Gurung, Project Coordinator for Rain Community.

“The main objective of running such campaigns was to give a sense of ownership to the students and the teachers alike. We, with support from IRHA, had set up the system in these schools to help them with their water problems and we have been training them for the same,” said Prakash Amatya,Technical Advisor of Guthi. “These schools have a mass of around 3,000 students. This means we can educate 3,000 people about the system and through them, reach their families too. Learning from the initiative, other schools can also adapt the system in their pre mises as a solution of emergency water supply.”

Under the campaign, they also monitored the conditions of people living in slums, particularly of Bansighat, and how they managed water problems. Photographers Hilaneh Mahmoudi and Murat Pulat, who had come to Nepal on IRHA’s recommendation, said, “We are here to document IRHA’s work and see how proper water supply changes the lives of people.

The way we see it, Nepal is rich in water resources but the water here needs to be purified. Rainwater harvesting may be a small aid to a big problem, a quick solution but for a sustainable solution, more investment in forms of time and money is needed. Countries with much less water resources are doing it, so Nepal can also do it. It needs to learn to utilize and manage its resources.”

Rainwater harvest system(set up in schools)

The roofs of the school have corrugated zinc plates tilted at an angle. The water that hits the roof gets collected in a drainage system fitted with pipes. Rainwater of the first 10-15 minutes is discarded in order to avoid any kind of contamination. This is known as the ‘First Flush’.After that, the pipe’s outlet needs to get blocked so that water can get collected in a 200-liter drum through the pipes. The drum is layered with sandand gravel, also known as ‘Rapid Sand Filter’, where the water goes through a purification process.

Then the purified water travels to an underground storage tank with a capacity of 50,000 liters. The water then gets used in the taps around the school premises around the year. The tank also provides water to the nearby well and keeps it recharged.

Rainwater harvesting does not necessarily need roofs to collect water. You can also set up the system where rainwater hits the most,such as an open surface. Then you just need a collection system and a drainage system for the water to flow through and get collected somewhere, maybe a reservoir or a tank.

Setting up these systems in the schools took about Rs 1.5-1.8 millions in investment. But to set up the system in a household will cost much less. One can benefit from the system for about Rs 20,000-30,000.


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