Definition of Full Normal Flow
Can someone give me SWMM's definition of "Full Normal Flow" in a circular conduit
If you are discussing the value of "Full Flow" in the Cross Section Summary then it is internally this equation for qFull
QFull = 1.486 * Slope^1/2 * Afull * Rfull^2/3 ---- n
it is used internally as cfs but printed in the user units in the RPT file.
Thanks very much. That is what I suspected but did not know for sure.
For interest how is "full" defined for a natural channel section where the maximum elevations of the left and right ends of the transect are not the same?
"Full" being the depth of flow equal to the pipe diameter, culvert rise, or max height of an open channel; and "Normal" indicating that the hydraulic gradeline slope term in a flow equation (like Manning's that Bob quotes below) can be approximated by the actual (geometric) slope of the pipe, culvert, or channel.
This also comes into play as the denominator in the Max/Full Flow Ratio, which is reported in the Link Flow summary table of the results Report file (Report|Status from SWMM5 menu).
Thanks. So for a pipe full flow is actually about 4% less than maximum flow that occurs when the pipe is slightly less than full?