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Combined Sewer with a New Reach Learncard 478112173


Description: There are 19,500 inhabitants living in a municipality. The wastewater generated is conveyed through a combined sewer. A reach of this combined sewer located in a short distance upstream of the sewage treatment plant is rehabilitated with following features:

Circular profile: DN 1,000

Length: 800 m

Height difference: 10 m

The screw pump lifting station at the treatment plant has a dry weather inflow of 48 l/s.

What is the flow in m3/s in this new reach, when the flow velocity is 1.7 m/s?


Q = v/A

1 m2 · π/4 · 1.7  m/s = 1.33 m3/s

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