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Estimate Bankfull Depth Exercise
Exercise Objective
To estimate Bankfull Depth given Bankfull Discharge data and the 9-207 geometric measurements.
Exercise Process
Form 9-207 data can be used to plot a depth to discharge relationship. You can either view the graph on this FGM Module page, or use Excel to view the relationship. In Excel, if you downloaded the completed workbook, the graph is already plotted. If you would like to create the graph, the Excel columns to use in the 9-207 worksheet are mean depth and discharge.With the Bankfull Discharge estimated earlier, find the associated width. To get width, read the nearest graphical data point or use the shown equation.
- Recall the Bankfull Discharge value found earlier in this FGM Module Section.
- Find the Bankfull Discharge (x axis) on the graph to locate the associated Bankfull Depth, D, (y axis) point.
- Consider the scatter of the data versus the narrowness of the regression line, and choose the most representative for your estimate.
- Record the D in feet from the log plot.
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