The Alamosa Trinchera Watershed (HUC 13010002) covers an area of approximately 2,282 square miles in south-central Colorado. The headwaters of the Rio Grande River are located in this watershed. The hydrology of the area is primarily influenced by snowmelt, which provides a significant portion of the surface water. The specific snowpack in this region is characterized by high elevations and abundant winter precipitation. Surface water in the watershed is primarily derived from streams and rivers, with some small reservoirs present. The water in these reservoirs contains high levels of dissolved minerals, including calcium and sulfate. The climatic conditions in the watershed are heavily influenced by its high elevation, with average annual precipitation ranging from 10 to 30 inches. Over the last few decades, the region has experienced increasing temperatures and changes in precipitation patterns, which may have significant impacts on the hydrology of the watershed.