Catchment populations.
A method of estimating catchment populations which is easily understood and calculable is described by Kevin Cottrell, North Western RHA statistician. It is based on traditional statistical theory and as such is robust in its application. It can give fairly accurate determinations of the population served by various services.
D002391:Catchment Area, Health; D003365:Costs and Cost Analysis; D008962:Models, Theoretical; D011153:Population; D012111:Residence Characteristics