Flowlink 5.1 Software Instruction Manual - Isco

Isco Flowlink 5.1 ® Software
Graph Window
4. Click OK. The text appears next to the data point on the
graph.
Notes:
• The Cancel button closes the Add Text window without
placing an annotation on the graph.
• To delete a text annotation from the graph, select the
data point for the annotation. Then right-click and select
the TextBox option from the popup menu which opens
the Add Text Box window. Click the Delete button and
Flowlink removes the annotation.
• There is a limit of 15 text boxes to a time span, although
more text boxes can be added elsewhere in the graph.
Note that if the time span is increased and the number of
text boxes exceeds the limit, the text boxes are hidden
from the display.
• Text boxes are saved with the Graph (.IGD) file, not as
part of the site data. Be aware that if the graph is used as
a template, the text boxes are retained when the
substituted data is displayed.
Best Fit Curves
To aid the analysis of data represented in a scatter plot, the Best
Fit Curves feature can apply a smooth curve to your data. This
can help you determine if the data fits within an expected model.
Additionally, best fit curves may be used when editing data in a
scatter plot.
To display a best fit curve on a scatter plot, open the graph
properties window and select the “Generate best fit curve” check
box on the General Properties tab.
You can select from two types of best fit curves. A third degree
polynomial curve can be applied using any data in series one and
two. A Manning formula curve can also be applied to plot the
level with a calculated velocity based on the pipe diameter,
roughness coefficient and slope. The Manning formula option
requires that series one use Level data for the Y-Axis and series
two use Velocity data for the X-Axis. Select the check box for the
desired option. If the Manning formula is selected, a window
appears to enter coefficients for the formula.
The best fit curve will be displayed with limits. Enter the limit
value and specify the limit type. Limit type options are:
• Percent of Best Fit Curve - Flowlink calculates upper
and lower limit lines using the limit value as a
percentage of each best fit curve data point.
• Offset of Best Fit Curve - Flowlink calculates upper
and lower limits using the limit value as a fixed offset for
each best fit curve data point.
• Percent of Maximum Value - Flowlink identifies the
maximum value in the best fit curve and determines an
offset value using the limit value as a percentage. Each
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