A fire response district is created with the expectation that the unit(s) provide a particular service. That service has many changing variables like Standard Operating Procedures within the department, the addition/removal of equipment or technologies from apparatus and personnel, etc. A constantly evolving expectation is the ability of the unit(s) within their district to respond to their own district's call volume.
Which brings us to a difficult to answer question. What is the percentage of Call Volume is a Station responsible for within their own district? It's something between 0% and 100%. 0% means the unit isn't needed. 100% is impossible without sacrificing things like multi-company drills, in-service-training, or the fact that there may be any other Call Volume at all. But, what is the answer?
An object of this site and its Data Analysis will be to explore how the stations and units of the San Diego Fire Rescue Department have - and do - handle the Call Volume within their districts. Important factors to explore will be how units in higher Call Volume areas are able to cover their districts as well as how stations with multiple units compare to stations with just one unit.