With my big beer and multiple rests I am wondering if I am going to wind up adding to much water to increase the temperature and end the day with an overflowing 10 gallon cooler. I know you guys know the formulas for adding water to bring the mash up to certain temperatures and the formulas that tell you how big the volume of the mash will be at the end.

I am going to be doing a 10 gallon recipe, so a 12 gallon boil, the recipe calls for about 22lbs of grain. If I get my normal efficiency (65 – 70) which is a little low, but decent I might have to throw in another pound or two of two row. The question I have is with the 22lbs of grain and the following mash schedule how likely is it that I will overflow my 10 gallon container?

Protein Rest - 122°F – 30 min

Beta Conversion – 140°F – 15 min

Alpha Conversion - 158°F – 40 min

Mashout - 170°F – 10min

If you guys could also include the formulas you use to figure this out that would be very helpful.