Tables (for airfields)
Compute the number of pipes.
Np = Qdes divided by Qpipe
Qpipe is obtained from a pipe capacity table.
In place length = S1 (width of slope) + width of road (or runway) + S3 (width of other slope =
__________ round up to next even number and add 2 feet, if no headwall downstream.
Order length = (In place length) (1.15). Round up to the next even number.
Check outlet velocity, V. If V is greater than Vmax provide erosion protection, or select a pipe of a
Use the smallest pipe with the least number of pipes.