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Old 10-11-2011, 12:02 PM
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mdvaden mdvaden is offline
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Join Date: Mar 2003
Location: Westside Oregon
Posts: 1,834
On this particular project, the soil beneath was very impermeable. Even naturally, not just from construction compaction 25 years ago. So I made a special soil mix that was not as sandy as a golf green mix, and made the lawn convex, rather than flat.

With small lawns, sometimes concave centers work with a catch basin. But I went convex this time so heavy rain water will head to the French drains along the sides.
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