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Combined Sewer with a New Reach Learncard 478112175


Question

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.


For the leakage test in this new reach the wetted surface has to be calculated. What is the result?

Answer

A = d · π · l

A = 1 m · π · 800 m = 2,513.27 m2



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