Underground drainage design.

I'm looking for a guide on underground drainage design. I'm sure I can find the relevant building reg's quite easily but I want something that explains things in how-to practical terms.
So can anyone point me to a good book, website, manufacturers guide, or whatever?
TIA
Sam
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find
explains
This any good :
http://www.pavingexpert.com/drain03.htm
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Cheers!
Sam
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