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(1) Rainwater or irrigation water penetrates through the soil layer to the composite protective drainage profile;
(2) The water on the composite protective drainage special-shaped piece is collected into the special drainage groove of the garage roof;
(3) The water in the special drainage tank flows into the sedimentation observation well through the siphon pipe arranged around the garage;
(4) The water in the sedimentation observation well flows into the reservoir after sedimentation;
(5) The property reuses the water in the reservoir or discharges it into the municipal rainwater pipeline.