To defend "fly/continuous" sparging. . .
Fly sparging can be either really really simple, or you can make it nuclear science, your choice. I prefer the simple approach.
At some point I'll have to put together a website. Has anyone done that for Batch Sparging?
My sparge arm is my right arm, literally. I place a spaghetti strainer on top of the grain bed ad use a 2 qt plastic picture to move my sparge water from my HLT into my mash/lauter tun (10 gallon round cooler with a domed false bottom. Palmer's book has instructions for building and designing a slotted manifold for either rectangular or round coolers. Not quite as simple as Denny's braid, but close.
Procedure, I sparge with no additional water until the wort level is at/just below the grain bed. At this point I rapidly dump (pour) sparge water into the strainer on top of the grain bed. How much? It doesn't matter!! just keep water over the grain bed, anything from .5 inch to 12 inches is fine.
Sparge rate is slow enough to not channel, which is what this thread is really about.
Measuring your results will show you how fast you can sparge on your system.
Simple yes, but for beginners I send them to Denny's site