Author : Himantha Raju L 1
Date of Publication :30th November 2021
Abstract: At the rate in which the India population is increasing, it is said that India will surely replace China from its number 1 position of most densely populated country of the world after 20-30 years. The Urban water demand 3.3 billion in 2007 to 6.4 billion in 2050 (United Nations, 2008). These will lead to high rate of consumption of most valuable natural resource „Water‟ resulting in augmentation of pressures on the permitted freshwater resources. In order to conserve and meet our daily demand of water requirement, we need to think for alternative cost effective and relatively easier technological methods of conserving water. Rain water harvesting is one of the best methods fulfilling those requirements. The technical aspects of this study are rainwater harvesting collected from rooftop which is considered to be catchment areas at Bearys Institute of Technology Campus. In this study Two Areas are assumed to be consisting of a single residential building and multi-storey (Hostel) building, its serves about 4 and 240 inhabitants. The roof area of the buildings are 81.316 m2 and 772.25 m2. We selected Concrete Bed Roof and Galvanized steel Roof as roof material. In the year 2018 the average Monthly rainfall of 316.391mm respectively, The rainfall data are being taken from the India Meteorological Department, Mangalore. We design and Proposed modular Rain Water Harvesting System for Beary’s Institute of Technology. After effectively implementation of proposed system has been tested and analyzed the design efficiency for Economic savings analysis. In all calculations for Runoff estimation, runoff coefficient is used to account for losses due to spillage, leakage, infiltrations catchment surface wetting and evaporation. Water collection efficiency is purely depended on roof material and found Galvanized steel Roof is best roof material for rainwater harvesting Construction cost of Proposed RWH modular system was estimated Rs.5710, Its indicate Low-cost roof top rain water harvesting. The highest Water Collection Efficiency obtained from Galvanized steel Roof 98.5 %. In the both roof top the highest Overflow found 46.26 % and 61.68%, was found in the 2KL and 10KL Tank size in the Area-1 and Area-2. In the Timebased reliability in Area-1 from the Concrete Bed Roof and Galvanized steel Roof was achieved 33.70 % and 36.71%, from the Area-2 the timebased reliability was achieved 7.12 % and 8.49 %.The benefit-cost ratio (BCR) for the 1% and 9% discount the benefit cost ratio was 3.07, 4.15 and 2.77, 3.72 from the Concrete Bed Roof and Galvanized Steel Roof for Area-1.The highest water saving was found from the Galvanized Steel Roof for the both areas around 81 & 2733 m3/ year
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