A preliminary design of the storm sewer system below is to be conducted. The pipes should flow full or slightly below at the design flow, if possible. All pipes must be self-cleansing at the design flow, and the selected slopes must not be less than the minimum acceptable for construction.

Important information:
All pipes are made of concrete with a Manning coefficient of 0.015 under full flow conditions.
Assume a minimum invert drop of 0.05 m across manhole 2 (MH2)
Assume a minimum cover requirement of 2.5 m throughout the entire system.
Commercial pipe sizes (internal diameters) that are available include the following:
0.200, 0.225, 0.250, 0.310, 0.380, 0.460, 0.530 m.
Local pipe details and ground elevations are provided in the summary table (next page). Summarize your design in this table.

In conducting your design, attempt to minimize excavation. Do not fully optimize your design, even though you may see opportunities to do so. Provide comments to indicate where you think improvements can be made and how you think you could attempt to improve your design.

There are 29 open cells, numbered 1 to 29, in the table; a correct answer in each cell is worth l mark (maximum 25 marks), so you don't need to complete the table to obtain full marks. Some of the answers will be easier to give than others. Optimize your chances for high marks! When doing your calculations, please refer to each cell to assist in grading.

 

Transcribed Image Text:

Q1= МН1 = 60 L/s A МН2 C МН4 в MH3 Q₂ = 20 L/s Q1= МН1 = 60 L/s A МН2 C МН4 в MH3 Q₂ = 20 L/s