1- Sketch a schematic drawing of a pneumatic sewage ejector system. Describe the situations pr circumstances where a pneumatic ejector station might be used. Discuss the unusual operating characteristics of a pneumatic ejector station as compare to an electrically (motor) driven duplex pumping system.

2- Why do engineers typically select larger peaking factors (PF) for water booster pumping stations than for sewage pumping stations?

3- Why does it take longer to fill a hydropneumatic water tanc than to empty the tank when the system is in operation?

4- List at least three factors to be considered when selecting the location of the manholes the design of gravity sewer systems.

5- Why are peaking factors (PF) typically larger for gravity sewer system design than for sewage pump station design?

6- Hydraulic ram is a water driven device that pumps water from a lower elevation to a higher elevation without electrical energy being applied. Explain the principle of operation of a hydraulic ram.

7- What is a "low pressure" sewer system? When would an engineer decide to use a low pressure sewer system, i.e.: what are the typical applications and limitations for using and selecting a low pressure force main system? Clearly sketch a low pressure sewer system.

8- What is a "vacuum" sewer system? When would an engineer decide to use aa vacuum sewer system, i.e.: what are the typical applications and limitations for using and selecting a vacuum sewer system? Clearly sketch a vacuum sewer system.