I wonder how many new reservoirs could be built with the £98 billion that is being wasted on HS2? Enough to sort the problem out I'm sure...and you could probably build a few canals from Wales and Northern England to move water across to the east and south east. And if the thinking was properly joined up...maybe, just maybe some of those canals could be used to transport nutrients from catchments like the Upper Wye across to the east where the farmland can utilise them, in a low carbon way.
I have yet to meet anyone who thinks HS2 is a good idea. It's a just a cash cow for a select few to profit from.