What is catchment area?
catchment area is A geographic area defined and served by a health programme or institution, such as a hospital or community health centre, which is delineated on the basis of such factors as population distribution, natural geographic boundaries, and transportation accessibility. By definition, all residents of the area needing the services of the programme are usually eligible for them, although eligibility may also depend on additional criteria.
source: A GLOSSARY OF TERMS FOR COMMUNITY HEALTH CARE AND SERVICES FOR OLDER PERSONS. World Health Organization, 2004.