Hi Laurel,
I was the ED at Cat Adoption Team for 12 years - until about a year ago - and can tell you what we did there. We had different ways we looked at capacity: types of cats, and types of housing.
We knew the actual number of kennels we had in each housing area and our average number of active foster homes. But gross housing capacity isn't particularly useful, like you said. What we needed to know was housing units by housing area or type: adult, kitten, URI, ringworm, admissions, etc. And the capacity that was typically in the greatest demand was rooms and offices onsite (we used offices as alternative housing), and fosters who could care for sick, neonatal, or socialization cats/kittens.
We also tracked capacity for certain groups/types of cats. This helped keep cats moving through our system: we essentially applied the adoption-driven capacity model to groups of cats: seniors, behavior issues, history of inappropriate elimination, special diet, FeLV, etc.
For some of those types of cats, we could predict what type of housing they would need: seniors, behavior cats, and FeLV for example, were nearly always going to need either a room, office, or foster home with that type of skill. So even if we only had two seniors in-house, we wouldn't take another one until we had the housing open up.
Making all this work required close coordination between teams: admissions, behavior, hospital, shelter, foster. They had a google group and a weekly meeting.
And of course, whatever you plan for, animals tend to move between categories. There are always surprises! But we found if we planned well, we could usually manage the surprises without too much drama.
For reference, we had 2,500-3,500 cats coming through a year with 800-1,000 of those spending time in foster.
Let me know if you have questions. I'd be happy to chat offline if that would help.
Karen
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Karen Green, CAWA
Ask Karen Green
http://askkarengreen.com------------------------------