Delaware

Watershed Hydrology

The Delaware Watershed covers an area of approximately 13,500 square miles, spanning four states (New York, Pennsylvania, New Jersey, and Delaware) and portions of six physiographic provinces. The hydrology of the watershed is complex and diverse, with numerous streams and rivers draining into the Delaware River, the main stem of which is approximately 330 miles long. The watershed is prone to periodic floods due to its topography and high precipitation rates. The area also experiences distinct winter snowpack, with the heaviest snowfall typically occurring in the northern portions of the watershed. Surface water in the Delaware Watershed serves as a major source of drinking water for millions of people, with several large reservoirs in operation. Climate trends in the region suggest that precipitation rates have increased in recent years, leading to flooding events and potential water quality concerns.


Surface Flows

Delaware Watershed

Snowpack Depths

Delaware Watershed

Dams & Reservoirs

Delaware Watershed

Groundwater Levels

Delaware Watershed

Delaware Rivers

Rivers of the Watershed