Assessment of Rooftop Rainwater Harvesting Potential in Karnal Smart city, (Haryana) using Geospatial Technology

Abstract

The present study aims to estimate potential of rain water stored from the rooftop and to study water requirement for present day scenario using the geo spatial techniques in Karnal municipal area (Haryana). Rooftop area was digitized using World View – II (0.5m resolution) satellite data. The available rainfall data has been analysed so as to know the rainfall pattern and calculate the Rooftop Rainwater Harvesting Potential (RWHP) in Karnal city. A total of 11100 building footprints were digitized (1:1000 scale) and roof top area of 9396122 m2 was found to be available for collecting the rainwater. It was calculated that a potential volume of 5430762.18m3 rainwater will be available on the study area, which is sufficient for toilet flushing in the study area. In this study, we estimated that annually 3140744700 L (57%) of total harvested rain water (5430762183.29 L) can be used in toilet flushing and 43% surplus water could be used for other purposes such as home-grown fruits and vegetables and watering in park.