Page 399 - Planning and Design of Airports
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348 Airp o r t D e sign
FIGURE 9-3 Inlet time curves (Federal Aviation Administration [2] ).
Coefficient of Runoff
Application of the rational method requires the exercise of consider-
able judgment on the part of the engineer. The runoff rate is variable
from storm to storm and varies even during a single period of pre-
cipitation. The coefficient of runoff depends on antecedent storm con-
ditions, slope and type of surface, and extent of the drainage area.
The range of values suggested by the FAA is indicated in Table 9-1.
