Urban rainwater utilization is a great way to solve water shortages and pollution in cities. Researchers have been looking at different ways to use rainwater effectively. They found that by creating models to predict rainwater runoff, monitoring its quality, and planning how to use it in cities, we can better manage water resources. The focus is shifting towards using rainwater more quantitatively and integrating different technologies to make the most of it. This will not only help with water shortages but also play a key role in controlling floods in urban areas.