The Severn Watershed covers an area of 7,188 square miles and spans across Maryland, Pennsylvania, and Virginia. The hydrology of the watershed is largely influenced by the Chesapeake Bay and its tributaries, including the Severn River. The area experiences a humid subtropical climate with warm summers and mild winters. Snowfall varies from year to year, but the watershed can receive significant snow accumulation during winter months. Surface water in the watershed is impacted by pollutants such as nitrogen and phosphorus from agricultural and urban runoff. The reservoirs in the watershed, including the Deep Creek Lake and Liberty Reservoir, serve as sources of drinking water for surrounding communities. Climate change is expected to impact the watershed by altering precipitation patterns and increasing the frequency of extreme weather events. Efforts are being made to reduce pollution and improve the health of the Chesapeake Bay and its tributaries, including the Severn River.