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  1. drainman

    Gravity flow rates and volumes in PVC pipe.

    In trying to determine maximum gravity flow rates for water in 4" PVC pipe, I'm coming up with some really screwy looking numbers. For years I've use tables from the University of Iowa that are based on flow at 70% of pipe volume. Unfortunately I have misplaced them in an office move...
  2. drainman

    drainage

    How do I divert water away from house and buildings?

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