Catchment analysis is a research method used in various fields, such as urban planning, hydrology, and marketing, to determine the geographic area or population that a particular service, facility, or business serves. This analysis involves studying the characteristics and behaviors of the people or entities within a defined catchment area, including demographics, competition, and demand. By understanding the catchment area, organizations can make informed decisions about location, marketing strategies, and service offerings to better meet the needs of their target audience.