Effectiveness of Rainwater Harvesting –A study of Domestic Rooftop Rainwater Harvesting in Kerala

  • Lalija V.K. Research Scholar in Economics, Kerala University Library and Research Centre, University of Kerala, Thiruvananthapuram
Keywords: Rainwater Harvesting, Rooftop Rainwater Harvesting, Run off, Run off Coefficient, Effectiveness.


Kerala, the ‘God’s Own Country’ is blessed with the beauty of green vegetation covering, rivers, ponds, backwaters, reservoirs, wells, springs, lakes and many other natural resources. As it is located in the humid tropics, it is also blessed with high rainfall and it is considered as the ‘Land of Water’.  It is also blessed with two predominant rainy seasons- South west monsoon from June to September and the North East Monsoon from October to December.  The state gets summer showers also. Despite the abundant water resources, Kerala faces water scarcity between the month of February and mid-May every year.  Thus Kerala is a state which is characterized by both the abundance and scarcity of water.  People are usually complaining about the lack of water but during the monsoon, plenty of water goes waste into the gutters.  This demands for an effective management of water during the water abundant days and its judicious use during dry periods. This is where Rainwater Harvesting proves to be one of the efficient ways to conserve water. With the growing increase in population along with urbanization and industrialization, the demand for water is continuously increasing.   Harvesting the precious rainwater is an option where the conventional water supply systems have failed to satisfy the water demand of the people.  Rainwater harvesting primarily consists of the collection, storage and use of captured rainwater either as a supplementary source of water or as a principal source of water. The present paper is an attempt to estimate the effectiveness of Domestic Rooftop Rainwater Harvesting System in Kerala through a systematic approach.  Rainwater from roof catchments can be a valuable source of water and quite safe to drink when stored in a properly installed and well maintained water storage system.


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