Usually the canals use a rivers water and run alongside the river, so if a lot of them are at the point of evaporating we’re in much bigger trouble than you presuppose and the Earth will be in it’s death throes.
But also, i think more evaporation of water leads to more rain and then flooding, so it all balances out ultimately. Just not in a aay that benefits humans at all
I wonder how the local climate would change with a national canal network… All that water evaporating will change some things.
Usually the canals use a rivers water and run alongside the river, so if a lot of them are at the point of evaporating we’re in much bigger trouble than you presuppose and the Earth will be in it’s death throes.
But also, i think more evaporation of water leads to more rain and then flooding, so it all balances out ultimately. Just not in a aay that benefits humans at all