It has been widely said that Kent has less rainfall per person than some of the driest parts of the world, e.g. Dallas and Morocco, but that simply means that we have a lots of people and need to be careful with the water we use. This week's news that the drought means that the River Medway is to continue to be diverted into Bewl Water somes as little surprise and neither does the impending hosepipe ban.
Looking at Southern Water's charges, they don't do this. The standing charge followed by a cost per unit is better that those gas companies that charge huge amounts for the first few units and then very little afterwards but the water charges are still not smart.
Having no standing charge and only charging a small amount for low volume use followed by higher charges for higher amounts would provide a real incentive to save water and still allow people cheap access to moderate amounts.