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Step 1 Water need

Water spash in Cambodian Orphanage

The first, the most logical, but also the most difficult question concerns the water requirement. Related to this question is the purpose of the water. Is it for domestic applications, for an orphanage, for a village, for irrigation? The best source for your information is to ask and measure on site. To help you finding a first indication, we can help you with some index numbers:

ApplicationIndex number
Westernised family100 litres per person per day. This is including water for bathroom, shower, dishes, cloth washing and so.
Non-westernised orphanageWith 20 litres per person per day you are probably rather high
Non-westernised villageIndex number of WHO: 40 litre per person per day. The real need is probably lower.
Irrigation Not answerable with an index number. What is the crop, How much sunshine you have to compensate (evaporation) and what is the rain supply on site? These questions should be answered with local knowledge. It’s also not bad to ask a specialist or to look in an irrigation manual. Also internet provides quite some information.