Halocho #741 - Diverting trouble

One may not divert trouble if it will then go to a fellow Jew. However, before the damage arrives, one may protect oneself from being damaged, even if somebody else may suffer as a result.

For example: If a river overflows into one's garden, one may not divert nor drain it, in a manner that will then flood a neighbour's garden.

However, before the river arrives near one's property, one is allowed to create a barrier, even if it would then go to a neighbour should it overflow, since the neighbour could also protect themself beforehand.

Source: Kitzur Shulchan Aruch 183:2

- Danny
Monday, 3 Adar-I 5771