One of the methods to calculate the hydraulic loss in
water pipes is the Hazen-William empirical equation. The equation is
dependent on the flow rate, the diameter, the roughness factor and the
length of the pipe.

The roughness factor is dependent on pipe material and other criteria.
Furthermore, the equation has certain limitations related to the temperature
of the water and the Reynolds number. Other equations can be used to
calculate the head-loss and they can relatively be more accurate such as the
Darcy-Weisbach equation.

The equation should not be used for flows with Reynolds number less than 10^5. The following engineering tool can be used to estimate the head-loss in meter. The tool can help graduate and post-graduate students who are studying mechanical, civil, chemical or environmental engineering and will be expected to use it after graduation while pursuing their careers in different fields of industry such as the water industry, nuclear industry and many more.

**Input Table
Output Table**

Flow rate (l/s):

Head-loss m/km:

Head-loss (m):

Velocity (m/s):

Roughness:

Pipe Length (m):

Pipe Dia (mm):

The roughness factor can range between 80 to 160 depending on the material and age of pipe.