The Elm Fork Trinity Watershed (HUC 12030103) covers approximately 1,783 square miles in North Texas. The watershed is characterized by flat to rolling terrain with clay and sandy soils. The hydrology of the area is primarily driven by the Trinity River, which flows through the center of the watershed, and its tributaries. The area receives an average of 37 inches of precipitation per year, with peak snowpack occurring in January and February. Surface water is an important resource for the region, with several lakes and reservoirs providing water for recreation, power generation, and municipal use. These water sources have been found to contain high levels of nutrients and bacteria, leading to concerns about water quality. In recent years, the region has experienced a trend of increasing temperatures and decreasing precipitation, which may have significant impacts on the availability of water resources in the future.