{"thcode":2,"term":{"code":1002,"name":"river systems","parent":1124,"scope":"Long water courses including main streams and tributaries."},"uf":[{"name":"river ecosystems","usewith":{"code":419,"name":"freshwater ecosystems","parent":54,"scope":"Biological communities and habitats that exist in lakes, rivers, ponds, and other bodies of water that are not salty."}}],"bt":[{"code":1124,"name":"surface water (non-marine)","parent":1308,"scope":"Open bodies of water, such as lakes, rivers, or streams.  All non-marine waters on the  surface of the earth, including fresh, brackish, and salt water."},{"code":1308,"name":"water resources","parent":777,"scope":"Stocks of water, the liquid derived from precipitation. A constituent of living matter and necessity for all life, it covers a large proportion of the earth's surface."},{"code":777,"name":"natural resources","parent":1174,"scope":"Stocks of anything naturally occurring that have a beneficial use for man including economic, nutritional, recreational, aesthetic, and other benefits."},{"code":1174,"name":"topics","parent":1,"scope":"Themes, subjects, and concerns for which USGS information resources are relevant."},{"code":1,"name":"Categories","parent":null,"scope":"Thematic terms for categorizing information resources.  This thesaurus is intended to support finding and understanding scientific information."}],"nt":[{"code":1001,"name":"river reaches","parent":1002,"scope":"Continuous parts of streams between two specified points."}],"rt":[{"code":560,"name":"hydrology","parent":291,"scope":"Branch of earth science that deals with water as it occurs in the atmosphere, on the surface of the ground, and underground."},{"code":998,"name":"stream discharge","parent":1113,"scope":"Volume of water in a stream passing a given point at a given moment in time, expressed as a measure of volume per unit of time, i.e. cubic feet per second, million gallons per day, or gallons per minute."}]}