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Originally Posted by terry j 
is not, for example, a seven well qrd symmetrical? Ie, flipping will end up presenting you with the same profile?
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No they are not symmetrical. RPG takes the last well of their 7 well qrd and splits it in half - putting half on the front and half on the back. So their design is symmetrical. But a QRD is not symmetrical. (BTW, there is no performance increase to their slight design change).
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In the cox book when they give the example of the -1 of the barker code, well I guess a good enough word would be 'the inverse'..and stangely enough it starts behind the normal ones, ie goes deeper. Heck, may as well make all of them deeper and diffuse lower! if you follow.
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The barker code has nothing to do with it being deeper. Just implementing the barker code will keep all diffusers at the same depth. In the D'Antonio and Cox book, they make a "big QRD" by using a "normal" 2 ft wide QRD for each well. This will put some of them deeper.
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Me? meh, just build a single diffusor of a longer length (greater base number, dunno 29 instead of four sevens or whatever) and no repetition problem. Maybe it will be slightly more work doing 'one 29' than 'four sevens', but better results.
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That will solve your repeat problem. But, you will have no performance advantage over an array of smaller QRD's using the barker code implementation.
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Again, the reason I'd like to know is I think I have a way where I could make an RPG skyline (with wells that is) in an afternoon...no wells and then it's back to the very long and tedious method. So it would be good to clear that up!
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The biggest issue with these smaller 2-D diffusers is absorption. With the wells you get quite a bit of absorption - especially if you make it very deep.