What is the importance of the narrower bottom in oval-shaped sewers during low-flow conditions?
Maintained higher flow velocity
Oval-shaped sewers have a narrower bottom section compared to circular sewers. During low-flow conditions, the reduced cross-sectional area at the bottom concentrates the flow, maintaining a higher velocity. This self-cleansing velocity (typically ≥0.6 m/s) prevents sediment deposition inside the sewer. This makes oval sewers suitable for sewers experiencing widely varying flow rates.
Important Questions from Design of Sewer
Which of the following statements is NOT correct?
The average daily flow of wastewater generated from residential, commercial, and industrial sources, specifically excluding any contribution from rainfall or stormwater, is commonly referred to as:
As per NBO, the gradient required to generate self-cleansing velocity for a 100 mm Φ sewer is _____.
Which of the following problems does proper sewer ventilation help to mitigate?
Maximum velocity condition in a flow-through circular channel section is:
