Ultraflux Uf 811 CO, Руководство пользователя, Страница: 45 / 106

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NT UF 811 CO GB (c) / March 2014
2) Choosing the definition mode of the hydraulic profile
The hydraulic profile may be defined according to two modes:

Absolute mode , in which the elevations marking the sections are specified in metres starting from
the bottom of the channel or the river up until the maximum foreseeable height (point 1 = lowest
elevation; point 20 = maximum foreseeable height) and in which the hydraulic coefficient of each
section is fixed. This mode is particularly suited for narrow channels with an irregular section.
Important: In absolute mode, all elevations are specified with regard to the reference plane H0.
 Relative mode , in which the elevations marking the sections are specified as an immersion
percentage (for example, point 1 = 95% immersion; point 20 = 0% immersion = surface), the
hydraulic coefficient being calculated based on the depth of the section. This mode is more
particularly suited to wide channels with a fairly regular section.
Select the required mode, absolute or relative.
3) Absolute mode
Starting with the lowest elevation (Pt1), specify for each section the upper elevation of the section and the
corresponding hydraulic coefficient.
Comments:
 The elevation of point no. 20 must be greater than the maximum foreseeable level,

For a given section, the velocity must be roughly constant.