Record Display for the EPA National Library CatalogRECORD NUMBER: 554 OF 2086
|Main Title||Geographic information system documentation of watershed data for Direct/Delayed Response Project, northeast database /|
|Author||Mortenson, Dorothy C.|
|CORP Author||NSI Technology Services Corp., Corvallis, OR.;Corvallis Environmental Research Lab., OR.|
|Publisher||Environmental Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency,|
|Subjects||Watershed management--Northeastern States. ; Geographic information systems.|
|Additional Subjects||Information systems ; Watersheds ; Surface waters ; Mapping ; Hydrology ; Quality control ; Performance evaluation ; Guidelines ; Standards ; Regional analyses ; Soils ; Lakes ; Land use ; Geology ; Northeast Region(United States) ; Acid rain ; Water pollution sampling ; Direct/Delayed Response Project ; US EPA|
|Collation||19 pages : illustrations|
The Direct/Delayed Response Project (DDRP) was designed by the U.S. Environmental Protection Agency within the National Acid Precipitation Assessment Program to predict the long-term response of watersheds and surface waters to acidic deposition. The purpose of the DDRP is to investigate and distinguish the time scales over which surface water systems might change chemically under varying levels of acidic deposition. The DDRP is examining a sub-set of watersheds sampled as part of the National Surface Water Survey. In the Northeast Region of the United States, 145 watersheds are under study. The DDRP required detailed watershed information on those characteristics thought important relative to the effects of acid deposition. The information was then mapped, then entered into a Geographic Information System (GIS). The document discusses protocols, guidelines, and standards used to complete GIS entry of the mapping data, and quality control procedures used to ensure accuracy and consistency.
"EPA/600/3-89/001." "March 1989." Includes bibliographical references (page 19). Microfiche.