Question: A sanitary sub - collector serves four housing developments in the municipality of Humacao. One development has 7 5 private residences, the second has 1

A sanitary sub-collector serves four housing developments in the municipality of Humacao. One development has 75 private residences, the second has 166 private residences, the third has 100 private residences, and the fourth has 22 private residences. The design flow rate of the subcollector is 499,125 gallons per day. That pipe has a diameter of 8 inches and a slope of 0.0030. The pipe is made of plastic (PVC) and wastewater flows through it by gravity until it reaches a sanitary sewer pump station, which is operated by the Puerto Rico Aqueduct and Sewer Authority. The depth of the invert of the sub-collector at the point where it enters the wet well of the station is 15'-8", as shown in the figure below.
In the wet well, which has a height of 22'-0'', the maximum depth of the wastewater is 6'-4?=?'' and the minimum depth is 2'-3''. The surface area of the wet well is rectangular, with a width of 4'-2". In the well there are two constant-speed submersible pumps, which alternate automatically. The hydraulic capacity of each of the pumps is 350 gallons per minute and their efficiency is 55.4 percent. The duration of each pumping cycle at the station is 16 minutes and 30 seconds. The pump station's cast iron power line has a diameter of 6 inches and an overall length of 349'-0''. In this pressure pipe, the friction losses are 5'-10''= and the vertical displacement of the wastewater is 19'-0''. The wastewater is pumped to a sanitary register whose inverted is located 5'-0'' below the ground surface. Downstream of this sanitary register, the wastewater flows by gravity through a plastic pipe (PVC),8 inches in diameter and with a slope of 0.0038 until it joins another sub-collector that serves two other housing developments and a shopping center.
Determine:
to. The hydraulic capacity (MGD and GPM) of the sub-manifold that arrives at the pump station.
b. The usable volume (gallons and cubic feet) of the station's wet well.
c. The length (feet and inches) of the wet well of the station.
d. Minor losses (feet) in the line of force.
and. The power (hp) of each of the pumps in the wet well.
f. The velocity of the wastewater (feet per second) at the sub-collector reaching the pump station and indicate if the value is acceptable.
g. The velocity of the wastewater (feet per second) in the pressure pipe and indicate whether the value is acceptable.
h. The velocity of the wastewater (feet per second) in the pipe exiting the sanitary register located downstream of the pump station and indicate whether the value is acceptable.
A sanitary sub - collector serves four housing

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