The document outlines a 3-year project funded by the US EPA aimed at improving the National Hydrography Dataset (NHD) by addressing areas with significant changes and errors. The project consists of four phases: data compilation, identification of streams requiring edits, data collection for post-disturbance features, and the final editing of the NHD. Each phase is expected to take approximately six months, except for the final editing phase, which will take around 18 months.