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Well, I guess the two factors may be related, as I don't necessarily understand how you do your calculations.
What I'm after is this: If you mash in with a certain amount of water, and then drain your tun in preparation for batch sparging, the volume of wort that comes out isn't equal to the water that went in. Some of it remains absorbed in the grain. I've seen numbers like 10lbs of grain absorb 1 gallon, 8lbs absorb 1 gallon, etc. Beersmith obviously accounts for this in some manner. I'm just wondering if you use some tweakable constant for this, or if its more complex than that.
OK - I found what you want (it shows up best in the water needed view): 1 lb of grain absorbs approx 0.12 gal of water, so 10 lb is 1.2 gal of water, etc... Unfortunately this parameter is currently not adjustable. I'll certainly look at making it so in the future.
I'm going to bring this topic back from the dead as I'm really hoping water absorbed by the grains can be a tweakable feature soon. The default of .12 gal per lb isn't what I get with my setup and its the only thing restricting Beer Smith's water usage calculations from being dead on with what I need.
I too would like to know if this is something that will be added! Beersmith works great, but I always have to add additional strike and sparge water to reach my desired volume. I think the grain is soaking up more water than beersmith is accounting for!