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
Surface run off caused by rainfall which is conveyed through sewer is called _______.
A watershed of area 90 hectares has a runoff coefficient of 0.4. A storm of duration larger than the time of concentration of the water shed and of intensity 4.5 cm/hr creates a peak discharge of
What is the condition for maximum discharge through a circular channel section using Manning’s formula?
Which one of the following is NOT a factor responsible for sewer corrosion?
For a circular sewer running partially full, the proportionate wetted perimeter is given by:
