Slope (gradient) required for drainage pipes** so wastewater can flow properly without causing blockages. 1️⃣ 0% Slope — ❌ Incorrect * The pipe is **completely flat**. * Water cannot move properly. * Waste and solids stay inside the pipe. * This causes **blockages, bad odors, and backups**. 👉 Pipes must always have a slight slope for gravity drainage. --- ## 2️⃣ 1.5% Slope — ✅ Correct for 2" & 3" Pipes * Used for **smaller drain pipes** such as: * Sink drains * Shower drains * Small branch line
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Slope (gradient) required for drainage pipes** so wastewater can flow properly without causing blockages. 1️⃣ 0% Slope — ❌ Incorrect * The pipe is **completely flat**. * Water cannot move properly. * Waste and solids stay inside the pipe. * This causes **blockages, bad odors, and backups**. 👉 Pipes must always have a slight slope for gravity drainage. --- ## 2️⃣ 1.5% Slope — ✅ Correct for 2" & 3" Pipes * Used for **smaller drain pipes** such as: * Sink drains * Shower drains * Small branch line
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