Assignment 7 sewer.Side-view:                                Rainfall &                Rainfall &                         ...
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Cu06997 assignment 7 2013_new

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Cu06997 assignment 7 2013_new

  1. 1. Assignment 7 sewer.Side-view: Rainfall & Rainfall & Waste water Waste water GL (ground level) +6.00 m +5,5 m P4 P3 P2 Ø500 concrete P1 weir Ø300 PVC Ø250 PVC IL +4,00 m IL +3,90 m IL +3,73 m Pump 50 mIL (invert level +3,53 m)Additional information:- equivalent roughness k-concrete = 1,5 mm, k-PVC = 1 mm- width weir = 2 mPreparationCalculate for each pipe: A, R (submerged) , C (rough boundary) and bed slopeQuestion 1 (Only wastewater, no precipitation)a)In this situation the PVC250 pipe is half filled with waste water. Calculate the discharge andvelocitiy.b)Check if the flow is turbulentQuestion 2 (Only wastewater, no precipitation)The supply of waste water on P3 and P2 is 10 l/s (both manholes). The pump capacity is 20l/s. Calculate the water depth in pipe P2-P3 . Also calculate the velocity and hydraulic radius.Question 3 (Rain, precipitation)3,75 ha paved area is connected to P2, 1,1 ha paved area is connected to P3. The rainfallintensity is 60 l/s.ha.a) Calculate the discharge rainwater which will flow from the paved area into the sewer?The figures show that the amount of rainwater in the sewer is much more than the amount ofwaste water. For the next questions we will neglect Waste water and the pump capacity.b)Indicate the direction of the flow with rainfall. Calculate the discharge for each pipe.c)Calculate the specific height (H) at the weir (c=1,8)d)Calculate the head loss for branches P4-P3, P3-P2 and P2-P1. Also calculate the velocityhead and velocity for each branch. Use Chezy’s formula.e)Calculate for each manhole the energy level and water levelf)Check if the flow is turbulentHenk Massink, 5 april 2013

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