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Changes
added link to model equations
* Cylinder diameter: (pump pipe) 32 mm for 1 to 10 metres deep, 25 mm for 10 to 20 metres deep and 19 mm for 20 to 35 metres deep
* Pistons: Rubber or HD PE (plastic) pistons spaced at 1 m
* Yield: (50 watt input) at a 10 m head the yield is 2 m³/hour . [http://www.mawama.org/rope-pump/rope-pump-efficiency Model equations can be found here]
* Population/field area served: Max 150 people or irrigation of 0.1 hectare
* Type of well: dug well of 3 metres to borehole of 6 to 20 cm diameter