IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308 _______________________________________________________________________________________ Volume: 03 Issue: 04 | Apr-2014, Available @ http://www.ijret.org 821 ROOFTOP RAINWATER HARVESTING (RRWH) AT SPSV CAMPUS, VISNAGAR: GUJARAT - A CASE STUDY Utsav R. Patel 1 , Vikrant A. Patel 2 , Manjurali I. Balya 3 , Harshad M. Rajgor 4 1 Lecturer, Civil Engineering Department, SPCE, Visnagar, Gujarat, India. 2, 3, 4 Assistant Professor, Civil Engineering Department, SPCE, Visnagar, Gujarat, India. Abstract India is land of versatile whether where inconsistency in rain is frequent. So as an option of having a back-up for water needs, one system becomes necessary which provides much saving of water; would be helpful in reducing wastage of water. Although rainwater harvesting (RWH) is gaining popularity as a sustainable water saving system in urban as well as rural areas, estimating required storage area for water remains an important design challenge so we are going to design an effective plan by which we can collect rain water into a storage for a particular campus and we are also going to make a design by which we can collect water to the ground and use it for a domestic purpose. Present paper majorly focuses on Rooftop rainwater harvesting (RRWH) of the study area as Sankalchand Patel Sahakar Vidhyadham (S.P.S.V.) Campus, Visnagar. The prime objective of this paper is to fulfill the scarcity of the water in the campus and then it need to be use it for domestic & drinking water supply. Key Words: Rainwater, Runoff, Catchment area, Rainwater Harvesting System --------------------------------------------------------------------***---------------------------------------------------------------------- 1. INTRODUCTION Rain water harvesting is defined as the process of collecting and storing rain for later productive use. Rainwater harvesting is a mini-scale water resources project that collect stores rainwater by structural measures and regulates and make us use of it for domestic and production use. The term water harvesting refers to collection and storage of natural precipitation and also other activities aimed at harvesting surface and all other hydrological studies and engineering interventions aimed at conservation and efficient utilization of the limited water enforcement of a physiographic unit such as a watershed It is also defined as the process of collection and storing water from the area that has been treated to increase precipitation runoff. A rainwater harvesting system comprises of components for - transporting rainwater through pipes or drains, filtration, and tanks for storage of harvested water. The common component of a rainwater harvesting system is shown below: Fig-1: Schematic of a typical rainwater catchment system (Source: UNEP IETC, 1998) 2. OBJECTIVES OF THE STUDY  Analysis of present water use at S.P.S.V. Campus  Problems with current system  Goals, constraints and regulations  Feasibility of rainwater collection system with recommendations 3. METHODOLOGY 3.1 Determination of what the captured water be used for: We have done a rough estimate of demand, supply, and storage capacity may be sufficient. On the other hand, if rainwater is intended to be the sole source of water for all indoor and outdoor end uses, a more precise calculation have been ensure adequate supply. 3.2 Determination of how much water can be captured: In theory, approximately 0.62 gallons per square foot of collection surface per inch of rainfall can be collected. In practice, however, some rainwater is lost to first flush, evaporation, splash-out or overshoot from the gutters in hard rains, and possibly leaks. Rough collection surfaces are less efficient at conveying water, as water captured in pore spaces tends to be lost to evaporation. Also impacting achievable efficiency is the inability of the system to capture all water during intense rainfall events. For instance, if the flow-through capacity of a filter-type roof washer is exceeded, spillage may occur. Additionally, after storage tanks are full, rainwater can be lost as overflow.