(Solved): Question Seven [10 marks] (a) A 1200 mm diameter stormwater sewer (for which the pipe chart in Appe ...

Question Seven [10 marks] (a) A 1200 mm diameter stormwater sewer (for which the pipe chart in Appendix 2 applies) is laid at a grade of 0.15 m / 100 m. Use the pipe chart to calculate the full-bore pipe flow and full-bore velocity in the stormwater sewer. (2 marks) (b) Using the proportional (partial or hydraulic) elements chart (Appendix 3) determine the depth of flow and velocity in the stormwater sewer for an estimated low flow of 600 L/s. (4 marks) (c) Using Manning's Equation estimate the possible full-bore flow (full discharge) of the pipe detailed in section 6a above. (Assume n=0.012). Do you get the same answer? (4 marks) Appendix 2: The pipe flow/Wallingford graph Velocity V (m/s) Discharge Q (V/s) for pipes flowing full N Diameter D (m) 2 111 112 11 15 Hydraulic gradient 100s (m/100m) Appendix 3: Partial or Hydraulic Elements graph 1.0 0.9 5 IN Relative depth of flow a 2 Discharge Hydraulic radius Velocity 0.3 0.2 0.1 001 02 03 04 05 06 07 08 09 10 11 12 13 Hydraulic elements in terms of hydraulic elements for full section &A, and