Development of Rain Water Harvesting System through National Highway Profiles by Using GIS and Field Survey

In last few decades groundwater recharge has reduced and surface water runoff has increased due to increase in built-up areas. Most of the rainwater is wasted due to the runoff in absence of proper water harvesting plan. It is required to develop a technique to harvest rainwater from all possible ways. It is easy to implement the project of rainwater harvesting system on National Highways. Longitudinal as well as cross-sectional slopes of National Highways are already very accurate to channelize the rainwater for harvesting. In this study, an integrated approach for assessing the rainwater harvesting capacity in minimum cost by using GIS and field survey approach for the study area on National Highway 27, Udaipur bypass. In a pilot study of 5 km segment of National Highway 27, it is found that 65 million liters of water can be harnessed for future use by 2000 villagers for about 240 days with per capita consumption of 135 lpcd (litre per capita demand). RS and GIS provide a good opportunity to gain a better understanding of contour pattern, natural and manmade profiles. The result indicates the application of GIS techniques help for conducting detailed field survey for planning the proper drainage system along the highways to store rainwater in the nearest reservoir. The socioeconomic survey was also conducted to select a good insight into the local situation.