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Engineering · Civil Engineering
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Problem 4 (20 pts.) A sanitary sewer is to be designed for newly developed 1700 ha area in 2017. Localregulations require that the sewer system be designed for an average per capita flowrate of 250 L/d/person, accommodate infiltration and inflow of 2 m not flow more than 75% full, be self-cleansing for 1.5 mm particles, have a minimum diameter of 150 mm, and have a maximum velocity less than 3 m/s. Field surveys indicate that the ground slope is 1%along the planned route of the sewer system. a) (5 pts.) Using the census data for the city for the last five years, predict the population of the city at the end of the design period. Assume a design period of 28 years. Round to the nearest 1,000. 1 l CIE 352, HW 2 Year Population 2013 8,000 2014 8,400 8,900 2015 2016 9,500 2017 10,000 b) If the main pipe segment draining the area is to be made of concrete and have the same slope as the ground, determine the required commercial-size pipe diameter.

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