A grading and drainage plan shows where the water goes. A simplified plan shows where to put swales (long, shallow ditches) and drainage systems to move, capture, and disburse the water on your property (see Chapter 7 for examples of some water-harvesting systems). At the other end of the spectrum is a full-blown engineering plan that's highly detailed and that will be of considerable use to your contractor should you choose to hire one.
kBEfl A good contractor often can get the grading right without a drawn plan. Invest in a plan if you need this level of detail or if an agency requires it; otherwise, just be sure you're in the hands of experienced professionals if your drainage situation is in any way tricky. See Part III of this book for complete information on sustainable grading and drainage.
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