Figure 330-36 shows an example of a standard calculation with the steps outlined
. Figure 330-37 is a nomograph for solution of headwater depth for inlet control
. Figure 330-38 is a nomograph for the solution of head depth for outlet control .
Both nomographs are for corrugated metal pipes .
Calculations for other pipe types and shapes can be accomplished with computer
programs or with nomographs found in Hydraulic Design of Highway Culverts Hydraulic Design Series No. 5 (1985) published by the Federal Highway Administration
(FHWA-IP-85-15) .
Figure 330-39 is a nomograph for finding values of critical depth, d c , in circular pipes .
The basic entrance conditions and flow coefficients for metal pipe culverts are shown in Figure
330-40.