You have been asked to assess the following old stormwater sewer, as shown in Fi

Question

You have been asked to assess the following old stormwater sewer, as shown in Figure P10.68, for a particular community. Old schematics indicate that the slope is 2m/400m, and y has a value of 1.75 m. It has been estimated that typical rain events in this community result in approximately 3 m3/s of stormwater entering into this particular sewer line. Recently, though, this stormwater sewer has consistently backed-up and overflowed during these same rain events, creating drainage problems. Based upon your engineering evaluation and judgment, what is the issue with this sewer line?

Explanation / Answer

there is sedimentation at the bottom reducing 'y' thsu there is frequent overflowing

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