6.

Your airfield carries aircraft up to 120,000 pounds with twin-wheel assembly. Your pipe must be 36

inches and it lies in a natural channel which allows five feet of cover. What gauge pipe will you use. Use Table

5-1, page 5-9.

A.

16

B.

12

C.

8

D.

2

7.

Before compacting the backfill, a CMP of 48 inches must be __________.

8.

A culvert must be placed under a roadway. You determine that the discharge rate requires a CMP of 18

inches. What will be the depth of cover, in inches?

A.

9

B.

12

C.

18

D.

36

9.

What is the difference between computing a pipe diameter for a roadway culvert and computing the pipe

diameter for an airfield culvert?