The researchers analyzed runoff in an area in Tamil Nadu, India. They used GPS and GIS to map land types and soil, finding the runoff varied in different land areas. They calculated runoff using two methods: SCS-CN and runoff coefficient. The highest runoff was in 2005, while the lowest was in 2018. SCS-CN showed more accurate results for calculating runoff and planning water conservation structures. Sandier soils had higher runoff, especially in built-up areas, while tree-covered areas had less runoff. The study suggests that event-based calculations are effective for estimating surface water runoff in the area.