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Key messages:
• After determining the flow rate required to meet crop water use, the next step is selecting the emitter.
• A hydraulic analysis helps in determining the size of pipes required for sufficient pressure.
• The speed that water flows through the pipe is important in determining the best pipe size.
• The final Total Dynamic Head (TDH) is expressed in metres head.
• Flow rate and TDH can indicate the pump which will give the desired performance at its Best Efficiency Point.

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