Slope in table B-2

[rosadeiventi]

Good evening, my name is Matteo, a student of Florence.
Can you explain me what is S longitudinal slope—-page B-7 (table B-2) in appendix B of the Hydraulic reference manual?
I’ve got 4 cross section as show in page B-1: i need slope to determine an initial estimate of the expansion reach length……i read some examples in applications guide and the manual used the formula:

S=(x[ft])/(y[ft])*(5280ft/mi)

but i don’t understand what is x and y numbers.

Thank you for all..
Matteo

[Chris G.]

longitudinal slope is the legnth along a reach divided by the change in water surface elevation (more precisely the change in energy elevation) over that length. x is the length, y is the elevation change.

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