With Respect to peak infiltration flow curve, Curve A is for

UPPCL AE 2019

⭕ A. New sewers

⭕ B. Old sewers

⭕ C. Both b and c

⭕ D. Vitrified clay pipe

📚 Explanation:

Infiltration flow is the groundwater entering sewers through cracks, defective joints, aging pipes, or porous materials.

✔ Old sewers typically have: 🔹 Cracks in pipe walls 🔹 Deteriorated joints 🔹 Increased groundwater seepage 🔹 Higher infiltration rates

Therefore, Curve A, which shows higher peak infiltration, corresponds to old sewers.

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👉 Therefore, the correct answer is: B. Old sewers

Key Points on Infiltration Flow Curves:

• ✔ Old sewers have higher infiltration due to defects.
• ✔ Curve A (higher infiltration) → old sewers.
• ✔ New sewers have low infiltration due to better construction and sealing.
• ✔ Infiltration increases with groundwater level and pipe deterioration.