I think I have this all wrong.
Hypothetical:
100NL game:
We have A6
on the button and we raise 4x to $4. BB calls. So there is $9 in the pot (just assume the .50 SB got raked)
Flop is xy
z
villain leads out for about $7 into the $9 pot. For sake of argument, we now have to hit our club to win. The total pot is $16 and we have to call $7, and we do so. pot is now $23.
On the turn we miss. Villain bets half pot - $12. Pot is now $35. We're getting 3:1 to see the river on about ~ 4.5:1 shot. This call is -EV..
How much money do we need to get in on ariver to pull a +EV situation with our flush draw?