It’s been generally accepted that having a suction inlet at the lowest point of a swimming pool improves circulation. Whether or not this is actually true is being debated but assuming it is, then it would make sense to have one. But my question is what sense does it make to have a suction outlet at the midpoint of the pool depth? Case in point:
Aside from looking bad (seriously, they look like sewer grates:)
It seems utterly pointless to have a suction outlet halfway between the shallow and deep ends. The only explanation I can offer is that the intake toward the deep end was used to supply the waterslide that used to be there (it was here, where the lifeguard tower is now:)
I wish I knew someone who worked for Milwaukee County and could tell me.
Also, I would ask them WTF is the grate/hatch in the deep end of McCarty Park’s pool, since the main drain is actually the large L-shaped channel running the length of the pool: