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Use perforated polystyrene pipe to create the drain system. Polystyrene pipe isn't a pressure drainage system; it will simply be sloped down the trench, allowing the water to flow away from the space (Image 1). Intersecting pipes are solid because they will draw water from surface inlets to the main drain (Image 2).
After installing the central drain and the secondary connecting drains, backfill the trench with gravel, which will prevent soil from clogging the holes in the pipe.
As a final protective step, lay sections of cardboard over the trench before placing soil back over the drain area.
Place concrete step pavers in an irregular pattern down the center of the space.
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