Imagine the shape of your land in light of your objective: slowing the moving water and giving it as many opportunities as possible to soak in and irrigate your proposed plantings. Also look at sources of graywater, such as washing machines and sinks; you may be able to use that water to irrigate fruit trees or other plantings. Finally, consider where you can install a cistern, either above or below ground, to capture roof runoff for use during the dry season.
It's also important to consider how and where you'll dispose of runoff beyond what your water-harvesting system can handle. In other words, if the rain falls hard and long enough, at some point it will fill your cistern and saturate your soil. All the rain that falls after that point has to be removed from the property safely. That's the job of your conventional drainage system — a topic that I cover at the end of this chapter.
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