IAN is working with the Chesapeake Bay Program (CBP) to support the development of the newest version of it's Chesapeake Assessment Scenario Tool (CAST). The CAST model is a web-based tool that allows nutrient and sediment load estimates for any specific geographical area within the Chesapeake Bay watershed. Using real-world monitoring data and modeling data, the CAST model can not only allow the user to understand the current nutrient and pollution levels, but also create a best management strategy that can help provide the greatest load reduction benefit by allowing the user to compare scenarios of management strategies. Therefore, the model can be used to create scenarios, allowing users to make informed decisions and implement the best management practices for the given area. This tool is crucial in helping state, federal, and local agencies determine the needs of waterways throughout the region, leading to a cleaner and healthier environment in the Chesapeake Bay.

IAN’s role in supporting this project is to provide a literature review on the nutrient budgets of forested areas within the Chesapeake Bay to help calibrate the model. IAN is also helping with analysis and research support for the spatial estimates of stream conductance, pH levels, and geogenic phosphorus throughout the landscape.