The McKinney Posten Bayous watershed (HUC 11140201) covers approximately 295 square miles in the southeastern region of Texas. The Bayous watershed is primarily located in Harris County, with small portions extending into Brazoria and Fort Bend Counties. The area is characterized by a humid subtropical climate with hot summers and mild winters. The watershed receives an average of 50 inches of precipitation annually, with occasional snowfall during winter months. The primary surface water feature in the watershed is the Brazoria Reservoir, which is used for municipal and industrial water supply. The reservoir also serves as a popular recreational area. The watershed's hydrology is influenced by urbanization and agricultural activities, which increase runoff and decrease infiltration rates. There is a trend of increased flooding in the area due to urbanization and land use changes. The watershed is home to a variety of species, including the bald eagle and the American alligator.