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Calculating Runoff With the TR-20 Method
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4 Click View to view the current distribution curve.
5 If you need to edit the distribution curve values, then use the use the navigation
buttons to locate the line you want to edit, and then type new values.
You can also use the following guidelines for editing the data:
If you want to} Then}
create a new distribution curve file click New.
add a new range of time increments click Range.
add a new row place your cursor in the row you want to
add a new row above, and click Insert.
delete a row place your cursor in the row you want to
delete, and click Delete.
NOTE
To make sure that each value in a column is greater than the next value,
select the Ascend Check box.
6 Click Save to display the Select Save Type dialog box.
7 Specify how to save the file by using one of the following options:
If you want to} Then click}
save the file as an .scs file so that you can load it
again at a later time
SCS Data.
save the file as an .hdc file so that you can
combine it with other hydrographs
Hydrograph.
8 Click OK to return to the SCS TR-20 Unit Hydrograph Method dialog box.