The researchers used satellite data to study water runoff in Nariganipalli watershed, India. They found that despite an annual rainfall of 72.5 mm, there is a water shortage in the area. The total water needed is 93.01 ha m, but only 68.5737 ha m is available. This shows a significant gap between water demand and supply. The study suggests that using models like SWAT can help manage water resources better in Nariganipalli watershed.