Owen Smith
2K Club - QQ Super Nova
The US Army corps of engineers is having to build (using dredgings from further upstream) an underwater ledge in the Mississippi to stop salt water going too far upstream. Flow has dropped so low that a wedge of salt water is making its way upstream underwater, salt water being denser than fresh. It's at risk of entering inlets where municipal drinking water is taken from the river.I understand that drought is adversely affecting navigation on the Mississippi River. Not good.
In Italy the river Po dried up completely this year the drought was so bad. Salt water has gone so far upstream it has now penetrated the soil and got into the fields, affecting crops. They say it will take years for rain to flush all the salt back out, and that is assuming rainfall returns to normal patterns.