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catchment area
In human geography, a catchment area is the area from which a city, service or institution attracts a population that use their services. For example, a school catchment area is the geographic area from which students are eligible to attend a local school.
Governments and community service organizations often define catchment areas for planning purposes and public safety such as ensuring universal access to services like fire departments, police departments, ambulance bases and hospitals.
==Creation==
Catchment areas are generally established and modified by local governments. These boundaries can be modeled using geographic information systems (GIS). There can be large variability in the services provided within different catchments in the same area depending upon how and when those catchments were established. They are usually contiguaous but can overlap when they describe competing services.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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