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The Darcy-Weisbach equation is used to determine flow characteristics in closed conduit systems (pipes). It is probably more common than the Hazen-Williams equation due to it being able to solve for systems in both laminar AND turbulent flow.

• headloss (ft)
• friction factor , length
• length (ft)
• diameter (ft)
• velocity
• gravity g

Friction Factor

The friction factor is either given or must be calculated using a Moody-Stanton diagram (available in both the AIO and CERM). Getting the friction factor from a Moody-Stanton chart requires the Reynolds Number , and relative roughness . Click here to continue reading →