In plumbing, a slope refers to the gradual incline of pipes that allows wastewater to flow away from fixtures and towards the main sewer line or septic system. Proper sloping is essential for effective drainage and prevents the accumulation of water and waste in pipes, which can lead to clogs and backups.

Typically, plumbing pipes are installed with a slope of 1/4 inch to 1/2 inch per linear foot (or 2% to 4% gradient) to ensure adequate drainage. This slope allows gravity to pull wastewater downward, facilitating its movement through the pipes and preventing stagnation.

Slopes are particularly important in drainpipes that carry wastewater from sinks, showers, bathtubs, toilets, and other fixtures. Without proper slope, water may pool in the pipes, leading to foul odors, corrosion, and blockages.

In addition to slope, proper venting and pipe sizing are also critical factors in plumbing system design to ensure efficient drainage and prevent plumbing problems.

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