Originally Posted by wilserbrewer
No, batch sparge around 6-6.5 gal total volume in the kettle. You will lose around a gallon or more during the boil depending on how hard you're boiling.
That's assuming a lot.
I'd suggest you get some brewing software like promash or beersmith. Your sparging amounts vary---and are dependent on many factors that can change frequently---like your evaporation rate (dependent on humidity and temp, size of pot, etc.), your deadspace in the MLT and kettle, whether you use a CC chiller...all these things can be adjusted and accounted for with the software. It also depends on your boil time!
That having been said...a good rule of thumb is 1/2 gallon of sparge water per pound of grain. So...10 lbs of grain in the mash = 5 gals of sparge water.