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Krishna lilac - IUWM


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Water Management at Krishna Lilac

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Krishna lilac - IUWM

  1. 1. BIOME ENVIRONMENTAL TRUST # 264, 6th Block, 6th Main, BEL Layout, Vidyaranyapura, Bangalore 560097, + 91 80 2364 1690,,, Background Krishna Lilac is a gated community located off Sarjapur Road. The residents of this colony have no access to BWSSB water supply or any form of a sewage disposal system. Hence, in order to meet their water demands, tanker supply has been adopted. There are 2 apartment buildings in Krishna Lilac with a total of 44 individual units. Krishna Lilac currently have 3 borewells in the premises with only one of them yielding water. The colony is also equipped with a main sump, having a capacity of 40,000 liters. The water supplied to Krishna Lilac is directed to this sump, softened by chemicals and provided to the occupied households. Approach Krishna Lilac have administered a 3 pronged approach in order to better their water management. The processes include Water Sub-metering, Rainwater Harvesting and Wastewater Reclamation. Water Sub-metering The Water sub-metering adopted has been functional with positive results. Such a system has ensured verifying and monitoring the amount of tanker water supplied with a meter being installed at the tanker unloading point. By metering the water usage of individual households, the demand is tracked and informed while ensuring billing transparency. This can be overall beneficial for the residents as billing will be variable depending on the meter reading of the individual household which is known. Such meters have been installed on the terrace. The water consumed in common areas is also monitored and equally expensed by the residents. Rainwater Harvesting The rainwater harvesting system installed covering 90 percent of rooftop area, is in two phases, with respect to the two apartment buildings within Krishna Lilac. In Phase 1, about 9.0 lakh liters of rainwater is collected annually. 50 percent of this rainwater is Case Study Name: Krishna Lilac Apartments Case Study #1 Location: Bellandur, Off Sarjapur Road Implementation: Integrated Water Management System
  2. 2. BIOME ENVIRONMENTAL TRUST # 264, 6th Block, 6th Main, BEL Layout, Vidyaranyapura, Bangalore 560097, + 91 80 2364 1690,,, collected in a 5 x 5 x 10ft unit that is used to directly recharge a 650 feet deep bore well, located next to the building. Subsequently, the other half of rainwater is filtered and directed to the existent main sump. In the case of Phase 2, an annual rainwater harvesting capacity of about 12.6 lakh liters can be achieved. The rainwater is directed through a single downpipe into a 7 x 7 x 12ft recharge tank located at the rear end gate. A percolation tank sized 5 x 7 x 10ft has also been fitted to divert excess water when the recharge tank is at capacity. The rainwater at the recharge tank is pumped to the main sump via a filtration unit when a demand is present. Wastewater Reclamation The wastewater treatment system in place has a capacity of 50 KLD and in an average operates at 60 to 70 percent full. The system follows a process of aeration, clarification followed by filtration. The treated wastewater is then disinfected and used for gardening and common toilets present in the colony. All excess wastewater is diverted to the 2 percolation pits that have been constructed. Each pit is sized at 30 ft. The remaining sludge from the treatment system is dried and taken to a nearby farm that is managed and operated by one of the residents. Learnings With the implementation of this particular integrated water management system, the residents managed to reduce their costs to a great extent. It was noted that, residents managed to reduce their water demand by nearly 15 percent with the addition of sub-metered billing, or from 195 lpcd to 165 lpcd. In order to achieve the sub-metering, pipelines were retrofitted by the apartment plumber within a period of 40 days, costing at Rs. 2800 per unit. With the inclusion of harvesting rainwater for storage as well as usage, the dependency on water tankers reduced by an average of 1 tanker load (6000 liters) per day. Subsequently, the reuse of the treated wastewater has also ensured the reduction of the water demand. In fact, residents are in the process of looking to expand the possible usage of the treated wastewater that can further reduce their demand by another 15 percent.