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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 m

IL (invert level +3,53 m)
Additional information:
- equivalent roughness k-concrete = 1,5 mm, k-PVC = 1 mm
- width weir = 2 m

Preparation
Calculate for each pipe: A, R (submerged) , C (rough boundary) and bed slope

Question 1 (Only wastewater, no precipitation)
a)In this situation the PVC250 pipe is half filled with waste water. Calculate the discharge and
velocitiy.
b)Check if the flow is turbulent

Question 2 (Only wastewater, no precipitation)

The supply of waste water on P3 and P2 is 10 l/s (both manholes). The pump capacity is 20
l/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 rainfall
intensity 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 of
waste 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 velocity
head and velocity for each branch. Use Chezy’s formula.
e)Calculate for each manhole the energy level and water level
f)Check if the flow is turbulent

Henk Massink, 5 april 2013

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Cu06997 assignment 7 2013_new

  • 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 m IL (invert level +3,53 m) Additional information: - equivalent roughness k-concrete = 1,5 mm, k-PVC = 1 mm - width weir = 2 m Preparation Calculate for each pipe: A, R (submerged) , C (rough boundary) and bed slope Question 1 (Only wastewater, no precipitation) a)In this situation the PVC250 pipe is half filled with waste water. Calculate the discharge and velocitiy. b)Check if the flow is turbulent Question 2 (Only wastewater, no precipitation) The supply of waste water on P3 and P2 is 10 l/s (both manholes). The pump capacity is 20 l/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 rainfall intensity 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 of waste 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 velocity head and velocity for each branch. Use Chezy’s formula. e)Calculate for each manhole the energy level and water level f)Check if the flow is turbulent Henk Massink, 5 april 2013