Using the TR-55 method, determine the depth of runoff for a 24-hour, 100-year precipitation event of 9 inches if the soil can be classified as group B and the watershed is contoured pasture with good hydrologic condition and an antecedent soil condition III.
What will be an ideal response?
Determine depth of runoff for a 24-hour, 100-year, precipitation of 9 inches.
First determine CNII value from Table 16.3 for contoured pasture with good
hydrologic condition and soil group B.
CNII = 35
Since the antecedent moisture condition of the soil is condition III, now find the
CNIII value for this soil condition from Table 16.5.
CNIII = 55
Determine the potential maximum retention after runoff begins, using Equation
16.7.
S = (1000 / CN) – 10 = (1000 / 55) – 10
S = 8.18 in
Determine depth of runoff using Equation 16.5.
Therefore, the depth of runoff will be 3.5 inches.
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