The researchers worked on expanding a model called the Green Build-out Model to figure out how much stormwater can be reduced in Washington, DC by adding more trees and green roofs in the city. They used this model to estimate the benefits of using eco-friendly tactics to manage stormwater in the capital. Their goal was to see how increasing tree cover and green roofs could help with managing stormwater. They found that these methods could have a positive impact on reducing stormwater in Washington, DC. This study was done to understand how using techniques like planting more trees and installing green roofs can help mitigate stormwater issues in urban areas.