Massachusetts hydrologic unit subdivisions

These data were released prior to the October 1, 2016 effective date for the USGS’s policy dictating the review, approval, and release of scientific data as referenced in USGS Survey Manual Chapter 502.8 Fundamental Science Practices: Review and Approval of Scientific Data for Release. Impervious surfaces such as paved roads, parking lots, and building roofs can affect the natural streamflow patterns and ecosystems of nearby streams. This data set summarizes the percent of impervious surface for hydrologic units in Massachusetts using a newly available statewide 1-m binary raster dataset of impervious surface for 2005. A hydrologic unit consists of all or part of a drainage basin, or an area of coastal drainage. Hydrologic units subdivide [...]