How did they know where to dig water wells in the past?

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How did people know where to dig a well before they had access to technology we have today (or the possibility to use drills we have now that you can use pretty much everywhere and drill deep enough that you’ll find water anyway)?

If you’re only using manual labour, you cannot dig very deep so finding water isn’t guaranteed. So how did they figure out where they should dig to find water? (I mean especially in the context of wells on farms or communal wells in villages.)

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