The study looked at ways to manage contaminant spills in stormwater runoff in urban areas for better water quality in stormwater harvesting systems. By using a computer model that mimics how pollutants spread through runoff water, researchers figured out how different factors affect spill cleanup. They found that spills during rainy weather move faster than those in dry weather. Heavy rainfall dilutes pollutants but also speeds up their travel time. Spills during intense but short storms reach harvesting points quicker and with lower concentrations of pollutants. To handle spills effectively, automatic systems to detect and divert them are crucial in urban areas because responses need to be quick to protect our water resources from contamination.