Page 402 - Planning and Design of Airports
P. 402
Airport Drainage 351
FIGURE 9-5 Portion of airport showing drainage design details (Federal Aviation
Administration [2] ).
drainage area is 31.42 acres, of which 6.44 acres is paved. Assuming
that the coefficients of runoff for pavement and turf are 0.90 and 0.30,
respectively, the combined C is 0.423. From Fig. 9-4 the rainfall intensi-
ties for durations of 5, 10, 15, 20, 30, 60, 90, 120, and 180 min are obtained,
and the volumes of runoff are computed as shown in Table 9-4.
