# Blog Archives

## Closed Conduit Hydraulics - Darcy-Weisbach Equation

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 $h_f$ (ft)
• friction factor $f$, length $L$
• length $L$ (ft)
• diameter $D$ (ft)
• velocity $V$ $\frac{ft}{s}$
• gravity g $32.2 \frac{ft}{s^2}$

#### Friction Factor

The friction factor $f$ 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 $Re$, and relative roughness $\dfrac{\epsilon}{D}$. Click here to continue reading