Page 431 - Planning and Design of Airports
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60 4.5 3.5 3.0 2.0 1.5 2.5 2.0
48 42 3.5 3.5 3.0 2.5 2.0 2.0 1.5 1.5 2.5 2.5 2.0 2.0 1.5 1.5
Nominal Diameter of Pipe, in 36 30 Wheel Load 30,000 lb 4.5 4.5 3.0 3.0 3.0 3.0 2.5 2.5 2.0 2.0 1.5 1.5 2.5 2.0 2.0 1.5 1.5 1.5 1.0
24 4.0 3.0 4.0 3.0 3.0 2.5 2.0 1.5 2.0 1.5 1.5 1.0
18 3.5 3.0 3.5 3.0 3.0 2.5 2.0 1.5 2.0 1.0 1.0
Pipe Cover 12 3.0 2.5 3.0 2.5 3.0 2.5 2.0 1.5 1.5 1.0 1.0
60 3.0 2.5 2.0 1.5 1.0 1.5 1.0
Flexible Pavement 48 2.5 2.0 1.5 1.0 2.0 1.5 1.0
Nominal Diameter of Pipe, in 42 36 Wheel Load 15,000 lb 3.5 2.0 2.5 2.5 2.0 2.0 1.5 1.5 1.0 1.0 2.0 1.5 1.5 1.0 1.0 1.0 1.0
24 30 3.5 3.0 2.0 1.5 3.0 2.0 2.5 2.5 2.0 2.0 1.5 1.5 1.0 1.0 1.5 1.5 1.0 1.0 1.0 1.0 1.0 Recommended Minimum Depth of Cover for Pipe, ft
18 3.0 1.5 3.0 1.5 2.5 2.0 1.5 1.0 1.5 1.0 1.0
12 2.5 1.5 2.5 1.5 2.5 2.0 1.5 1.0 1.0 1.0 1.0
Kind of Pipe Clay sewer pipe Clay culvert pipe Concrete sewer pipe Concrete sewer pipe (extra-strength) Reinforced-concrete culvert pipe Class I Class II Class III Class IV Class V Corrugated metal pipe, gauge no. 16 14 12 10 8 TABLE 9-9
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