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Guru
Only if it falls in catchment areas/aquifers . If it (for instance) ends up in the storm water drains of south west london, it may end up at Mogden, filling the pools and forcing the release of tons of raw sewage into the Thames.1. Almost all water poured onto the ground will evaporate and later return as rain, and thus not be wasted at all.
More generally, droughts do occur and are alleviated by not wasting water.