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Chapter 5 Working with Hydrology Commands
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13 If the Auto Calc check box is not selected, then click Compute at the bottom of
the Tabular Hydrograph Method dialog box to calculate and update the Peak
Discharge and Peak Time values.
After you enter all your data, the Total Area, Peak Discharge, and Peak Time are
computed and displayed towards the bottom of the Tabular Hydrograph
Method dialog box. The Total Area label displays the sum of the areas of all
watershed subareas. The Peak Discharge label displays the calculated peak
discharge for the entire watershed. The Peak Time label displays the computed
time of peak discharge.
14 You can save and output the calculation results, and view messages and
warnings:
If you want to} Then}
save the calculation results to a
hydrograph file
click Save. For more information, see
Saving TR-55 Tabular Runoff
Calculations in this chapter.
clear the calculator of its contents click New.
save the calculation results to a text file click Output.
view error messages click Messages.
delete a row of subarea data place your cursor in the row to delete and
click Delete.
view the data in tabular format click Tabular.
view the composite hydrograph click Graph.
NOTE
From the Composite Hydrograph dialog box, you can click Plot to plot the
curve, or click Settings to change the appearance of the graph, such as the
line colors.
15 Click OK to exit the dialog box.
Saving TR-55 Tabular Runoff Calculations
When you click Save to save the TR-55 Tabular Method runoff calculations, the
Select Save Type dialog box is displayed.
To save the TR-55 Tabular data
n
Click Hydrograph to save the hydrograph data as an .hdc file. Use this option
if you want to use the hydrograph for further calculations.
n
Click Tabular to save the TR-55 Tabular data as a .tab file. Use this option to
save your calculations so you can recall and edit them at a later time.
These files are stored in c:\Land Projects R2\<project name>\hd folder.