There has, and probably will be, a smaller number of girls teams compared to boys teams. On average the number of girls teams per club is 12.3. Some posters above call for 12 teams to be the minimum for a club. I agree that twelve is a good aim, although a minimum if 8 is probably more realistic for some. Having access to a good number of kids is the key as it is the depth that determines a club's strength. This may not mean having a high number of teams at a club, but rather forming strategic alliances with social comps.
Forestville, Sturt and Norwood are over this average number so obviously there are a lot of girls living around Wayville, Pasadena and Marden who are playing basketball.
So let's go through it Div by Div. U10 kids are born in 2002 and 2003. The youngest is 7 and oldest just turned 9. They're in year 2 and 3! Let's face it, for the inner metro clubs, it's pretty easy to drive 10 mins from one suburb to another on a Saturday morning. It's a lot harder for some of the outer city clubs, particularly those who draw from country areas. Mavs who draw a lot of players from Murray Bridge have to drive an hour just to get to the toll gate means playing an 8:30 am game at Port Adelaide is an early start from the farm. Similarly, if you live in a northern area and play for Centrals or a Victor Harbor girl playing for Tigers, to get to Port Adelaide for an 8:30 game is pretty tough.
Therefore, the cynic in me says that inner city clubs should have girls teams in U10, but why would clubs like Mavs, Centrals and Southern bother at this level.
For U12, U14, and U16, it's a bit different. Each club would want to have at least 3 teams here. Div 1 for the best and top age, Div 2 for the lower age, then at least one team in the Div 3 for those starting out and those still picking it up. But then again, why would you want to play Div 3 when you could play social for half the cost at the same standard?
For Mavs and Centrals, why would you bother even putting in a Div 3 team when BSA refuse to schedule a home game at your stadium? At least BSA schedule games at the Vale, so coming from Strath or Victor or Willunga is comfortable. If you live at Murray Bridge and are in the Mavs U16 boys Div 3 team playing Port Adelaide on a Thursday night at 6 pm - you get picked up from school and drive straight down, affecting your studies - why bother?
For U18 (currently 94 and 95) most kids are in year 11 or year 10. Year 11 is the start of SACE nowadays and kids need to do some sport, but you could expect that some girls might want to concentrate on their studies in year 11, so I would expect some drop off.
So, in U18 I would say each club should aim for 2 teams rather than 3.
I would say for an inner city club (Forestville, Sturt, South, West, Woodville, North, Norwood) then the minimum number of teams should be:
U10 (2 teams), U12-U16 (3 teams), U18 (2 teams): Total 13 teams
For the outer city teams:
U10 (0), U12-U16 (2 unless BSA schedule home games), U18 (2): Total 8
Therefore, I would suggest that based on numbers, Forestville, Sturt, Norwood and Tigers have more teams than expected, Mavs, West, North and Centrals have about enough teams, and South and Woodville need some help to work on lifting numbers.