Pumps are needed to keep the water moving, and they would be snapped into the pipeline where needed. The pumps would receive their electric power from the attached wires. The pumps might weigh a several hundred pounds, so they are placed in the beds of dedicated  4WD trucks. Transformers weighing several hundred pounds  are also placed on the pump trucks because it is efficient to use a higher transmission voltage and then use a a transformer to step down the voltage to the pumps.

The top figure is a 4WD truck with the hose on a reel. 

The bottom figure is a 4WD truck with the pump and the transformer.

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