Using Rainwater to Meet Rising Demands

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Gerhard Schubert GmbH - Verpackungsmaschinen

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Klüber Lubrication München SE & Co KG

Roof-Top Rainwater Harvesting

The system mainly consists of the following sub components:

• Catchment: The surface that receives rainfall directly is the catchment of rainwater harvesting system. It may be a terrace, courtyard, paved or unpaved open ground. The terrace may be flat RCC/stone roof or sloping roof. The catchment is the area that collects the rainwater for the harvesting system.

• Transportation: Rainwater from the roof-top should be carried through down-take water pipes or drains to the storage/harvesting system. Water pipes should be UV resistant (ISI HDPE/PVC pipes) of the required capacity. Water from sloping roofs could be caught through gutters and down-take pipe. On terraces, the mouth of each drain should have a wire mesh to restrict floating material.

• First flush: First flush is a device used to flush off the water received during the first shower. The first shower of rain needs to be flushed to avoid contaminating storable/rechargeable water by the probable contaminants of the atmosphere and the catchment roof. It will also help in cleaning silt and other material deposited on the roof during dry seasons. Provisions for a first rain separator should be made at the outlet of each drainpipe.

Realising the significance of wastewater management, Klüber Lubrication India Pvt. Ltd, a business division of the Freudenberg Group, undertook rain water harvesting in its manufacturing plant located in Mysore under the project titled ‘Rain water Harvesting – An open funnel to the sky’. The main source of water for the city of Mysore is the river Cauvery, which dries up during the summer season, inducing water scarcity in the region.

The OKS (a Mysore factory) avails underground water supplied by the State Industrial Board. It needs significant water for gardening purposes. The garden needed watering on most of the days, as Mysore is located in the tropical region, where the soil does not retain adequate humidity for a long time.

Further, there is no rainfall for about five months of the year at a stretch. Rainwater harvesting, a traditional technique in dry regions of the world, is being explored because it makes sense to view water as a precious natural resource not to be wasted but whose utilisation should be maximised.

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