Overland Flow Slope -

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The subcatchment slope should reflect the average along the pathway of overland flow to inlet locations. For a simple geometry, the calculation is simply the elevation difference divided by the length of flow. For more complex geometries, several overland flow pathways may be delineated, their slopes determined, and a weighted slope computed using a
path-length weighted average. Such a procedure is described by DiGiano et al., 1977, pp. 101-102. I am looking for the aforesaid paper describing the procedure. Appreciate if anyone can send me a soft copy or the website where can I get a copy. Thank you!