The Black Macatawa Watershed, or HUC 04050002, covers an area of approximately 240 square miles in southwest Michigan. It is primarily a rural watershed, with mixed land use including agriculture, forested areas, and urban development. The watershed is characterized by rolling hills and small streams that flow into the Black Macatawa River, which eventually empties into Lake Michigan. The hydrology of the watershed is influenced by both surface water and groundwater, with the latter being an important source of water for irrigation and drinking water. The area receives an average of 82 inches of snowfall annually, which contributes to the surface water flow. The reservoirs in the watershed are used for flood control, recreation, and water supply. The climatic trends in the watershed include increasing temperatures and precipitation, which may have implications for the water resources and ecosystems in the future.