Note! - inches are commonly used in the Imperial unit system. P = "wetted" perimeter of the duct or pipe (m, ft) Hydraulic diameter can be calculated with the generic equationĪ = area section of the duct or pipe (m 2, ft 2) Note! - the hydraulic diameter is not the same as the geometrical equivalent diameter of non-circular ducts or pipes. The hydraulic diameter is used the Darcy-Weisbach equation to calculate pressure loss in ducts or pipes. Note that the velocity in the Reynolds equation is based on actual cross section area of duct or pipe. Hydraulic diameter - d h - is the "characteristic length" used to calculate the dimensionless Reynolds Number to determine if a flow is turbulent or laminar.
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