Is er voldoende regenwater in Nederland?
Regenval: 0,8 m/(m2.a) (KNMI) Oppervlak Nederland: 41.453 km2 = 41,5 10^9 m2 (Wiki) Dus regenval jaarlijks: 0,8 *41,5.10^9 = 33.10^9 m3/a...
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