{"thcode":2,"term":{"code":1667,"name":"hydrologic processes","parent":101,"scope":null},"uf":[],"bt":[{"code":101,"name":"biological and physical processes","parent":1174,"scope":"All continuing activities, functions, and phenomena associated with organisms and non-living matter."},{"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":398,"name":"floods","parent":1667,"scope":"Relatively high water that overflows the natural or artificial banks of a stream or coastal area that submerges land not normally below water level."},{"code":1692,"name":"groundwater and surface-water interaction","parent":1667,"scope":"Traditionally, management of water resources has focused on surface water or groundwater as if they were separate entities. As development of land and water resources increases, it is apparent that development of either of these resources affects the quantity and quality of the other. Nearly all surface-water features (streams, lakes, reservoirs, wetlands, and estuaries) interact with groundwater. These interactions take many forms. In many situations, surface-water bodies gain water and solutes from groundwater systems and in others the surface-water body is a source of groundwater recharge and causes changes in groundwater quality. As a result, withdrawal of water from streams can deplete groundwater or conversely, pumpage of groundwater can deplete water in streams, lakes, or wetlands. Pollution of surface water can cause degradation of groundwater quality and conversely pollution of groundwater can degrade surface water."},{"code":514,"name":"groundwater flow","parent":1667,"scope":"Movement of subsurface water in the saturated zone from areas of recharge to areas of discharge."},{"code":1365,"name":"percolation","parent":1667,"scope":"The movement of water through fractures or interstices of a rock or soil."},{"code":1375,"name":"runoff","parent":1667,"scope":"Flow of water over land surfaces (including paved surfaces), typically from precipitation."},{"code":1686,"name":"saltwater intrusion","parent":1667,"scope":"Infusion of saline waters in an aquifer or body of surface water."},{"code":1687,"name":"scour","parent":1667,"scope":"Erosion of sediment in a stream bed, often occurring at manmade structures such as bridge supports."},{"code":1113,"name":"streamflow","parent":1667,"scope":"A type of channel flow, applied to a specific part of surface runoff in a stream, whether or not it is affected by diversion or regulation."},{"code":1299,"name":"water circulation","parent":1667,"scope":"The flow of water in a body of water due to wind or other forces or variations in density or temperature. Use 'water circulation' for situations that are not specifically covered by narrower terms. Use 'ocean circulation' for water circulation in the oceans."},{"code":1360,"name":"water cycle","parent":1667,"scope":"Interchange of water among land, oceans, and atmosphere."}],"rt":[{"code":927,"name":"precipitation (atmospheric)","parent":63,"scope":"Any or all forms of water particles that fall from the atmosphere, such as rain, snow, hail and sleet."}]}