How is the total dynamic head calculated in a septic system?

The calculation of total dynamic head in a septic system is crucial for ensuring adequate pumping performance and system efficiency. Total dynamic head encompasses all opposing forces that a pump must work against to move wastewater from the dosing tank through the discharge pipe.

The correct approach involves adding the elevation difference, which is the vertical distance between the dosing tank and the discharge point, to the friction losses incurred in the discharge pipe. Friction losses occur as wastewater flows through the pipes and are a result of the internal resistance faced by the liquid due to the pipe’s material, diameter, length, and any fittings or valves present in the system.

Including both the elevation difference and the friction losses provides a comprehensive understanding of the pump's requirements to overcome gravity and frictional resistance, ensuring the system is properly sized for optimal performance. This holistic view is essential for installing effective and reliable septic systems, enabling the wastewater to be transported efficiently without causing backups or failures.