Rainwater harvesting

It's been a month now and I still can't stop myself from rushing to the terrace in the morning, after a night of heavy rain. After several months of seeking ways (unsuccessfully!) to harvest rainwater for our apartment, we had arrived at an elementary solution. Most local experts whose advice and opinion we sought were unable to help. Even the internet tips were of little use since they dealt with individual houses and/or entire apartment buildings. Though our terrace is fairly large, we realised that the catchment area (the area which directly receives the rainfall and provides water to the…

In the earlier parts of this series we have seen as to how in a layout context, the Resident Welfare Association (RWA) is the body that is aware of the issues that the residents face, can engage with the residents to identify appropriate solutions, can build consensus on issues/resolutions and enable the implementation of measures to ensure issue resolution. We have also discussed the relevance of Rainwater Harvesting (RWH) in the layout context, and dealt with FAQ’s on the same. In this article we will see how the RWA can play the role of a 'Resource Manager' for water, assuming…

The first two parts of this series dealt with arriving at a broad layout-level strategy for rainwater harvesting (RWH) and how to engage the residents and decision-making bodies of the layout to move the strategy forward. When engaging with residents, one will inevitably face many questions about why people should consider rainwater harvesting (RWH), how the systems are constructed and how they work. The following discussion concentrates on how to address these FAQs, first focusing on general RWH questions and then on more technical questions related to RWH for direct storage and groundwater recharge. Rainwater Clubrainwaterclub [at] gmail [dot] com1022,…

In Part 1 of this series, we touched on the crucial first steps to implementing rainwater harvesting (RWH) in a layout - asking yourself why the layout should implement RWH, what implementation strategies make sense in your layout, and consulting with someone with RWH technical capacity to assist with conception, design and implementation. This part focuses on the human dimension of implementing RWH at a collective level. As we saw in Part 1, the two RWH implementation strategies for a layout are household collection for domestic use, and collection from households and common areas for groundwater recharge. To implement either…

Step 2 – What should be the RWH strategy for your layout Another factor to consider when determining the best RWH interventions for your context is your layout’s land use pattern. In a typical urban residential layout, land use is usually as follows: approximately 60% is rooftops, 20% is roads and the rest is open-areas like parks, playgrounds, footpaths, transformer yards or drains. This means that the largest amount of rain is falling on rooftops. Rooftops are also clean and so rainwater running off of them is clean. It is prudent to try and capture this at the household level…

Rainbow Drive, an apartment complex of 200 houses seems to be all that the name suggests -- tree-lined pathways, moist breezes, and verdant gardens. But no one would believe that this is situated on Sarjapur Road, the ‘waterless colony' as this region of south-eastern Bangalore is being called in private circles. Rainbow Drive was beginning to go the way of all ‘dry' colonies just four months ago. It does not have a water supply connection from the Bangalore Water Supply and Sewerage Board (BWSSB), and has been dependent on its rapidly depleting borewells. According to a resident, Jayawanth Bhardwaj, formerly…

This is a quick primer by for Bangaloreans on borewells, open wells, recharging, and undergound acquifers. Bangalore originally used to rely on open wells more than borewells. Open wells get their water from shallow acquifers that lie at depths of less than 80 feet from the ground. Many parts of Bangalore still have open wells. Illustration: Sripathy Konada, Biome Environmental Solutions. Click for larger picture. Borewells are in essence, narrow holes dug deep into the ground. A borewell taps into a deep acquifer, which essentially water in rocks. Because waters of shallow acquifers are subject to contamination (in part to…

As monsoon clouds brood over a parched city, a few harassed citizens gear up for an interesting harvest this season. Water. Since May 1st, 2007, the government has been forcing rainwater harvesting (RWH) techniques at new constructions in the metro. The Bangalore Water Supply and Sewerage Board (BWSSB), has made it mandatory for applicants of water connections to implement RWH, even though there is no formal announcement. Was this force necessary? “Certainly!” says A. R. Shiva Kumar. Principal Investigator and Scientist, Karnataka State Council For Science & Technology (KSCST), who is advising the BWSSB on these techniques. He adds that…