Now that the path averages have been calculated, the overall slope of the area or subareas must be calculated in

order that we can obtain the right coefficient from the "C" value chart. This can be accomplished by taking the

arithmetical average of all of the paths in the entire basin, if it is classified as simple, or the average of all of the

paths in each subarea if the basin is complex.

The overall slope of the area can be calculated using this formula:

Since this example is for a simple area, you will represent this entire basin with one "C" value for an overall slope

of 3.9 percent. If this example was a complex area, you would calculate the overall slope for each subarea and

use a "C" weighted formula.

STEP 9. Find the "C" value for the basin or subarea. Now you can go to table 2-1 on page 2-6 and find the

correct "C" value. GMd with turf slope 2 percent > < 7 percent 0.35. Refer to figure 2-8.