valuma
Valuma is a term used in Finnish hydrology to denote a drainage basin or catchment—the land area from which precipitation and groundwater drain toward a common outlet such as a river, lake, or aquifer. It is defined as the hydrological unit bounded by topographic divides that separate it from neighboring valuma-alueet (catchment areas).
The boundary of a valuma is typically delineated with geographic information systems (GIS) and digital elevation
Within a valuma, various processes control water movement, including rainfall, snowmelt, infiltration, surface runoff, evapotranspiration, and
Valuma serves as the fundamental unit in hydrological analysis and water resource management. It is used in