Abstract:An indexing and classification system for water and other earthscience data is defined for use in the U.S. Geological Survey's National Water Information System (NWIS), and other similar systems such as the U.S. Environmental Protection Agency (EPA) Water Quality Control Information System (STORET). All five-digit EPA parameter identification codes, which are used in both of these systems, have been classified into a three-level hierarchical system of categories called groupings. The first level in the hierarc… Show more
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