The only important component of dynamic head is pipe friction, this being determined by water velocity in the delivery pipe. The higher the velocity the higher the friction loss and it is important to match the pump to the pipeline.
When Delivering to an open outlet pressure at the delivery point is zero and so in most water supply installations this is not a factor in total head calculations. However, when pressure delivery is required e.g for fire installations or irrigation nozzles the required pressure at the nozzle must be included when calculating total head.
Centrifugal pumps have the capability of creating a vacuum in a suction pipe which enables them to suck water from below their setting level. The maximum theoretical suction lift is 1 atmosphere (approx 10m), though the maximum practical lift is well below this.