Factors affecting Water Conservation Potential of Domestic Rainwater Harvesting – A Study on Bengaluru Urban

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Dr Pleasa Abraham
Assistant Professor , BASE University

Date: 26th June, 2021

Time: 12.00 noon IST

Place: Webinar, Microsoft Teams


Over the years, industrialization, increasing population, expanding agriculture and high standards of living have increased the demand for water at the static level of water supply in Bengaluru. Bengaluru being the third most populous city in India, water conservation becomes increasingly important to meet the water demands of the growing population at present and in the future. Bangalore Water Supply and Sewerage Board passed the Rainwater Harvesting Regulation in 2009 requiring that every owner or occupier of a building having site area of not less than 2,400 square feet on or before 2009 or every owner who proposes to construct a building on a site area of not less than 1,200 square feet provide rainwater harvesting structure for storage, use, or ground water recharge by 31st December 2011. Since then Domestic Rainwater Harvesting (DRWH) has been gaining popularity in Bengaluru. This study examines the factors affecting water conservation and water conservation potential of DRWH in independent houses in the city of Bengaluru. Water conservation potential of RWH is calculated and taken as the dependent variable upon which runoff coefficient, number of residents, number of sources of water, water demand per day, cost of maintenance, cost of installation and catchment area were regressed to examine the influence they have on water conservation. It is found that three variables; runoff coefficient, roof catchment area and number of sources of water were significant on water conservation independently. There is significant water conservation potential and, on average, there is 13.11 percent water saving per household per year with DRWH structures.