I started my design by using Hydraflow Express to determine what inlet spacing to begin with by allowing shoulder and half lane in the spread, but when I piped it and ran it in storm sewers not even the shoulder is flooding. I looks right but does it seem right that express could have been that far off the mark?
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Joe -
As they are runing the same set of calculations, Express is not off.
I would suggest taking a look at the roadway slope values as one is in ft/ft and the other is in percent. A common error that I honestly do from time to time.
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