"Scotland, in simple terms, is a water-rich nation whereas England is not. Loch Ness, one of Scotland’s 27,000 freshwater lochs, contains more water than all rivers and lakes in England and Wales combined.  Scotland also possesses more than 125,000km of rivers to boost its supply.  Overall, Scotland’s rivers, lochs, ponds and canals contain over 90% of freshwater in the UK."
http://www.businessforscotland.com