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Coimbatore Corporation has begun installing rainwater harvesting and reuse systems in its offices to collect and reuse rainwater for non-potable purposes. According to Corporation officials, work is in progress at the Central Zone office in Race Course, where a ground-level tank with a capacity of one lakh litres is being constructed. The system is designed to collect rainwater from rooftops through pipelines, filter it, and store it for reuse within the premises. A 7 HP motor will pump the stored water from the underground tank to nine overhead tanks, each with a capacity of 1,000 litres, twice a day for use in toilets and for garden maintenance. The system is expected to meet non-potable water requirements of about 8,000 litres a day. Officials said the initiative follows the successful implementation of a similar system at the Corporation’s main office in Town Hall. Set up at a cost of ₹38 lakh, the system was commissioned in July and has since been in operation. It covers a built-up area of 25,000 sq. ft. and collects rainwater from 40 rooftop points. The system can store up to 1.08 lakh litres of water in an underground tank. Rainwater collected from various points undergoes a two-level filtration process through an advanced filtration unit equipped with a removable stainless steel dirt basket that allows regular cleaning and maintenance. The system ensures that the stored water remains usable without stagnation. Excess water from the tank is directed to a groundwater recharge structure, helping to prevent rainwater from flowing into stormwater drains. The Corporation plans to install similar systems in other offices, schools, and parks across the city.
