A study was done to understand how groundwater flows on Long Island, New York, and how it responds to different factors like pumping and recharge. Scientists used a computer model to simulate groundwater movement and estimate how old the water is in different areas. They also looked at where water from the ground ends up in rivers and the ocean. By studying the aquifer system, they found out how water moves underground and how long it takes to reach different places. This information can help manage water resources on Long Island more effectively.