"Full Pool" is really just a feeling. If it feels good, call it "Full Pool." . . . . . . . . . . .I do agree with the spillway reference, or when water starts to, or is close to exiting.
Excerpt from Robert Crais' "The Monkey's Raincoat:" "She took another microscopic bite of her sandwich, then pushed it away. Maybe she absorbed nutrients from her surroundings."