SID calculates
hydraulic sections of any form and of any geometrical and hydraulic
characteristics. 
The program determines, for a given section, the height and speed
values reached by the water, assuming that the channel has a prismatic
form of infinite length.
The
formula used by the program utilises the average velocity as a function
of the mean radius of the section, that is equal to the ratio between
the area of the hydraulic section and the wet boundary, of the loss
of load and of the friction coefficient.
In
order to perform the calculation the program required the description
of the geometry of the section and some hydraulic parameters, that
is, the resistance coefficient, the projected flow and the channel
slope.
One
can look at the table containing the fundamental characteristics
that define the channel classes and the relative roughness coefficients
using a specific command.
The
program determines the diagram of the flow curve as a function of
the height, with the indication of the height reached as a result
of the projected flow.
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SID
