ok here's my understanding of it in the best way i can describe it. there is summer pool, winter pool, then there is different levels of pool stage for the fall draw down. kind of like a target of this many ft down by this date. now here is how i get it lol. i don't know what the pool levels are for each day and i'm sure that very few others do too. so, look at the column that says summer pool feet, then look at the column that says todays pool feet and subtract the 2. it's pretty much always been right by what i've seen. hope that helps.