Kathmandu Valley receives an average annual rainfall ranging from 1,480 to 1,600 millimeters, making roof water harvesting a viable solution to alleviate water shortages throughout the year. The intriguing telefilm Jalpari, created by Harivansh Acharya and Madan Krishna Shrestha, highlights the significance of water conservation. In this film, a water-related issue emerges prominently when two families are united through marriage. The daughter, who grew up near village streams and waterfalls, marries into a family in Kathmandu, causing her parents to worry about water scarcity. On the other hand, there is no water shortage at the groom’s home, showcasing innovative approaches to water management.
Roof water harvesting is especially practical in Kathmandu Valley. If every household utilized water collected from their rooftops, the dependence on water tankers during winter could be significantly reduced. This technology proves critically beneficial in areas that still lack access to Melamchi water supply. The film portrays water not merely as a necessity but as the foundation of prosperity and health. Where water is abundant, it fosters both physical well-being and mental tranquility.
The impact of Jalpari and the contributions of the MaHa duo are noteworthy. The film was produced to enhance public awareness about water conservation and the importance of harvesting rainwater. According to Rajendra Shrestha, Executive Director of the Environment and Public Health Organization, although Jalpari was made nearly 20 years ago, Kathmandu’s water challenges remain largely unchanged. Population growth and climate change have further increased water demand. However, recent technological advancements have made collecting and purifying rainwater much more feasible.
Current building regulations mandate that new houses implement systems to channel rainwater from roofs through pipes to underground tanks. According to municipal rules, households are prohibited from directly discharging roof water onto streets. In cases where the water is turbid, small filters can be installed for treatment. The overall investment for such a system typically ranges between NPR 10,000 and 15,000, making it affordable for many. Additionally, water purifiers available on the market can be installed to make collected water safe for drinking. The average annual rainfall in Kathmandu Valley over the last 30 years has been approximately 1,600 millimeters.
