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Modular Roof Top Rain Water Harvesting in Aligarh

29 Oct 2019

Aligarh Development Authority (ADA) in Aligarh district of Uttar Pradesh is setting up a modular roof top rain water harvesting (RWH) unit atop the office of the Divisional Commissioner, Aligarh Division.  From water shortage to water abundance, the system will also enhance water quality and provide unlimited water storage capacity.

This was reported by a team of central government officers who visited the district on 8th August, 2019 as a part of the Jal Shakti Abhiyan (JSA) to inspect existing water conservation measures and begin new initiatives in rainwater harvesting, renovation of traditional and other water bodies/tanks; reuse and recharge structures; watershed development; and intensive afforestation.

According to Sudhir Kumar Gangadhar Rahate, Additional Secretary, Ministry of Power, who is the Central Nodal Officer (CNO) for the JSA campaign; ‘Modular RWH’ is a new technique for Roof Top Rain Water Harvesting. It is both convenient and easy to maintain in comparison to traditional RWH.

Difference between processes of traditional RWH and modular RWH systems

Unlike conventional RWH system, the recharge chamber in modular RWH need not be PCC/ RCC, thereby saving cost. Further, the PCC/ RCC Storage-cum-Recharge Tank after few years gets infested with algae/cobwebs and is very difficult to clean; whereas modular RWH with polypropylene blocks wrapped on all sides with geo-textile is almost maintenance free and its useful life is more with an option of portability if there is a need to use the occupied land for some construction purposes. Also, it has been the past experience that conventional RWH system always goes dysfunctional after 2-3 seasons whereas modular RWH system in its concept and design has addressed several factors that help them having many relative advantages over the conventional RWH system.

Other differences between the two methods are:

Under Smart City Project, Aligarh Nagar Nigam is executing 2 conventional RWH schemes in Gandhi Park and another 3 conventional rooftop RWH systems in government buildings including Treasury Office.   Following the first visit of the central JSA Team, Aligarh Nagar Nigam decided to take up additional 20 rooftop RWH schemes for government buildings.  These will be a mix of conventional and modular rooftop RWH systems.

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