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I'd make sure your problem approach is tuned to the actual problem...for instance if it's surface water you may not need a deep drain, but if it's ground water you need to tame then it could be worth it to build something more substantial.
A simple black 4" perf'd pipe with a nylon sleeve will do a pretty effective job at removing the runoff from your downspouts. It doesn't need to be buried deep or covered in rock...just give it enough angle so it drains well.
-spence
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