Drainage systems consist of the pipes, fittings, and components designed to collect and safely convey wastewater and stormwater away from a building to a sewer, septic tank, or disposal area. This includes PVC drain pipes, traps, cleanouts, grates, and gutter systems. Proper design and installation are critical to prevent blockages, backups, and foundation water damage. Selection depends on the type of waste (greywater vs. blackwater), local building codes, and the required flow capacity. Systems must be installed with the correct slope (pitch) to ensure gravity-driven flow and prevent standing water, which leads to odors and clogs.

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