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Watershed delineation is the process of identifying the boundary of a watershed, also referred to as a catchment, drainage basin, or river basin.It is an important step in many areas of environmental science, engineering, and management, for example to study flooding, aquatic habitat, or water pollution.
eGRID2019 was released by EPA on February 23, 2021. It contains year 2019 data. eGRID2018 was released by EPA on January 28, 2020 and eGRID2018v2 was released on March 9, 2020. It contains year 2018 data. eGRID2016 was released by EPA on February 15, 2018. It contains year 2016 data. eGRID2014 was released by EPA on January 13, 2017.
The CompTox Chemicals Dashboard is a freely accessible online database created and maintained by the U.S. Environmental Protection Agency (EPA). The database provides access to multiple types of data including physicochemical properties, environmental fate and transport, exposure, usage, in vivo toxicity, and in vitro bioassay.
In the United States, the EPA and the United States Geological Survey (USGS) are the principal federal agencies working with the CEC to define and map ecoregions. Ecoregions may be identified by similarities in geology , physiography , vegetation , climate , soils , land use , wildlife distributions, and hydrology .
Other terms for a drainage basin are catchment area, catchment basin, drainage area, river basin, water basin, [3] [4] and impluvium. [ 5 ] [ 6 ] [ 7 ] In North America, they are commonly called a watershed , though in other English-speaking places, " watershed " is used only in its original sense, that of the drainage divide line.
The latest update notes and new features can be found on the EPA website in the download section. [10] Recently added in November 2015 were the EPA SWMM 5.1 Hydrology Manual (Volume I) [11] and in 2016 the EPA SWMM 5.1 Hydraulic Manual (Volume II) [12] and EPA SWMM 5.1 Water Quality (including LID Modules) Volume (III) [13] + Errata. [14]
A map of Superfund sites as of October 2013. Red indicates currently on final National Priority List, yellow is proposed, green is deleted (usually meaning having been cleaned up). Superfund sites are polluted locations in the United States requiring a long-term response to clean up hazardous material contaminations. Sites include landfills ...
This is a list of Superfund sites in Maryland designated under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) environmental law.The CERCLA federal law of 1980 authorized the United States Environmental Protection Agency (EPA) to create a list of polluted locations requiring a long-term response to clean up hazardous material contaminations. [1]