Transcription of Chapter 6 Storm Sewer
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Chapter 6 Storm Sewer
WSDOT Hydraulics Manual M Page 6-1 June 2010 Chapter 6 Storm Drains 6-1 Introduction A Storm drain ( Storm Sewer ) is a network of pipes that conveys surface drainage from a surface inlet or through a manhole, to an outfall. Storm drains are defined as closed pipe networks connecting two or more inlets, see Figure Storm drain networks typically consist of lateral(s) that discharge into a trunk line. The trunk line then receives the discharge and conveys it to an Drain StructureFigure configurations like the one shown in Figure are typical, there are also other configurations that do not meet the Storm drain definition as shown in Figure In cases where there is only one inlet and no more than two pipes, this should be classified as a culvert on the plan sheets and designed as follows:1.
slope, and roughness. The preference is to have the HGL below the pipe crown. After sizing the pipe, verify that the HGL is below all rim elevations. A storm sewer design may be performed by hand calculations, as described in Section 6-4, or by computer program, as described in Section 6 …
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