Is "Inlet - composite Spread Slope" being computed in Geopak drainage? Can anyone explain if it is.
I am trying to follow HEC-22 and it says Sx is a known value based on a gutter cross section and they give a diagram. Whenever I get a rpt, they are something different.
Example,
My spread section is as follows
Alignment 22' to EOPavement. then 7.62% for 1.39' which represents the lowest point on the gutter. (my order is correct in geopak drainage)
Geopak says the composite spread slope is 0.0595.
Ive tried using a nomograph to duplicate. Tried doing calcs too...using HEC-22 procedures
Anyone help?