Instruction manual
NivuFlow 550
page 58
rev. 00 / 12.04.2017
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Procedure:
1. Draw a vertical auxiliary line from the lowest point of the channel to the top on the
scale drawing.
2. Use this line as start to draw horizontal auxiliary lines through the distinctive points
where the profile changes to the left and to the right.
3. Measure the distance of these lines from the centre line to the points left and right.
4. Convert the breakpoints true to scale and enter the values into the three columns
of the value table as follows: height / width to the left / width to the right.
Be sure to observe
the important hint on the
Viewing Direction
for free profiles
5. Start at level "0" to define the start of the canal.
6. Enter all other breakpoints "free" in terms of height and width.
The distance between the individual height points may vary. To define the profile
it is not really necessary to specify all 32 breakpoints since the transmitter will
linearise the distance in between.
In case of large irregular variations of the channel dimensions use lower distances
between the breakpoints within this section.
After the channel parameters have been set completely the entered values will be
indicated proportional to each other graphically.
7. Use the 3D view to verify the dimension settings. This visual aid helps to identify
major programming mismatches.
Free symmetric Profile with Height-Area (Height-Area)
Some hydraulic tables contain height-area value pairs for symmetric channels instead of
height-width. In such a case enter the according value pairs into the selected height-area table.
Be sure to observe
the important hint on the Viewing Direction for free profiles on page 57.
Proceed right as described in the settings for height-width profiles. Only a graphical
representation of the programmed profile is not available here.
Q/h-Function (Q=f(h))
Fig. 23-5
Q/h-Function
