The Pine Island Bayou Watershed (HUC 12020007) covers an area of approximately 847 square miles in southeast Texas, USA. The area is characterized by a humid subtropical climate with warm summers and mild winters, and receives an average annual rainfall of 55 inches. The watershed is primarily composed of forested wetlands, and the hydrology is dominated by the Pine Island Bayou and its tributaries. The watershed has a relatively low gradient, making it vulnerable to flooding during heavy rainfall events. The surface water in the watershed is impacted by agricultural activities, urbanization, and industrial processes. The Pine Island Bayou Reservoir is a major source of drinking water for the region, and contains high levels of organic carbon and nitrogen. The watershed has experienced significant climatic changes in recent years, with an increase in the frequency and intensity of extreme weather events. These changes have led to increased flooding and erosion, and have had negative impacts on the water quality and ecosystem health of the Pine Island Bayou Watershed.