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Combined Sewer with a New Reach Learncard 478112172


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.


Lay out the flow chart with the magnetic cards or sketch the chart. Calculate the slope of the new reach in per mill.

Answer

S = h/l · 1,000

S = 10 m/800 m · 1,000 = 12.5 ‰




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