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What is Total Dynamic Head?

Understanding Total Dynamic Head (TDH)

Total Dynamic Head (TDH) is a term used in fluid mechanics to describe the total amount of energy required to move water through a system. It is an important concept in the design and operation of pumps, pipelines, and other fluid systems.

TDH is a measure of the resistance that a fluid encounters as it flows through a system. This resistance can come from a variety of sources, including friction between the fluid and the walls of the pipes, changes in elevation, valves, and other fittings.

TDH is expressed in units of feet or psi (pounds per square inch).







TDH Formula:

TDH (ft) = Pumping Level + Elevation Gain + Friction Loss + Pressure Requirement at end of line


Pumping level - this is the measurement of elevation from the water level to the top of the well head. Resistence in the well is measured from the water level not the where the pump is set.

Elevation gain - the measurement of vertical elevation gain above the well head


Friction Loss - friction loss is calculated based on the length of the the pipe run through the system, pipe size (diameter) and the flow rate. Higher flow rates, smaller pipe size and longer runs all will increase total resistance in the system.

Pressure requirement - many systems will require a psi rating at the end of the pipe run (ex. house pressure system). This should be added to the calculation when designing a pump system to offer the desired performance.

In practical terms, TDH is used to determine the appropriate pump size, pipe size, and other system components necessary to achieve a desired flow rate. A pump with a higher TDH rating can overcome greater resistance and pump water to a higher elevation.

In conclusion, Total Dynamic Head is a crucial concept in fluid mechanics, especially in the design and operation of pumps and pipelines. It helps to determine the resistance that a fluid encounters as it flows through a system and the amount of energy required to overcome this resistance. Understanding TDH is essential in ensuring efficient and effective solar water pumping system.

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