037-8 Wyo. Code R. § 8-9
A pipeline will usually fall into one of the following classes:
a. A pipeline that is flowing partly full at head gate under gravity feed. Use Manning's and Kutter's velocity calculations (suggested roughness coefficient for plastic pipe - n=0.010). The hydraulic properties shown on the map should include area, hydraulic radius, slope, roughness coefficient, velocity, and capacity.
b. A pipeline that is flowing full under pressure from pump. The pipeline capacity wiil be dependent upon the pump capacity and the hydraulic properties shown on the map, and should include pump type, horsepower, and rated output capacity and head. The head should be at least equal to the total head the pump will be working against plus the head loss in the pipe for the capacity shown.
c. A pipeline that is flowing full at head gate under gravity feed. There are several formulas, such as Manning's formula, adapted for pipe flow (suggested n=0.010 for plastic pipe); the Moody resistance diagram (smooth pipe curve); and the Hazel-Williams formula (suggested C-120 for plastic pipe); which can be used to compute head loss due to friction for pipelines flowing under pressure. Total head, head loss due to friction (and other causes if considered), as well as nominal pipe diameter, area, velocity, and capacity at the outlet, should be shown on the map.
037-8 Wyo. Code R. § 8-9