# F11_hw08_answers - ENV 4561 Assigned Fall 2011 Homework 8...

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ENV 4561 Fall 2011 Homework # 8 Assigned: October 20, 2011 Due: October 27, 2011 1. (100 points) The plan view of the sewer system you have to design is shown in Figure 1. The annual average daily flow you are designing for is 130 gal/capita/day. The number of house connections to the sewer is presented in Table 1. Assume an average of 2.3 people/house. a. (40 points) Determine the size of the pipes that will carry the flow in the sewer system shown below, assuming a safety factor of 3. Use the table 38 on the next page to determine the ID of the pipes for your calculations. Use Manning’s eq. for full flow conditions. Assume n = 0.013 b. (40 points) Determine the number of manholes in each section and the number and location of lift stations in the system. Assume a maximum pipe length between manholes of 500 ft, with 30 ft pipe sections. Also assume that the maximum depth you can go below the ground surface is 12’, and the sewer pipes should be at least 2’ below ground (i.e. 2 ft of cover soil) c. (20 points) Find the actual depth of the water traveling between manholes for each section. Use the Christensen experimental method for the depth.

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## This note was uploaded on 11/29/2011 for the course ENV 4561 taught by Professor Zoltek during the Fall '08 term at University of Florida.

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F11_hw08_answers - ENV 4561 Assigned Fall 2011 Homework 8...

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