Drought-Can we learn from the past?

Throughout the 15th and 16th Centuries my family were constantly in disputes about water. Sheep were an important source of wealth and merchants grew rich on the wool trade in neighbouring towns such as Tiverton and Exeter. Sheep need drinking water though. Not as much as cattle certainly but nevertheless spring fed streams were vital at a time before the widespread availability of iron pipes and metal water troughs. So ownership of the water rights and control of the streams was of crucial importance to those who farmed the animals and wanted to share in this wealth.
Between the 16th and 19th centuries the plentiful availability of labour enabled the construction of 'catch meadows' and their associated irrigation systems which followed the contours of our Devon valleys. Carrying either water or a combination of water and cattle dung from spring sources or collecting points, they helped crops grow with a mixture of irrigation and fertilisation. Even in a year of average rainfall, irrigation will improve grass growth so judicious release of water into these systems paid dividends.
I have seen intricate and clever systems of water transfer in other parts of the world. The paddy fields of China and the Far East and the long and delicate channels flowing down the rocky valley sides in what were then the Trucial States adjoining the Gulf are but two examples. In areas of water shortage mankind has become adept at water transfer. In a country where we have been used to plenty however such as the UK we have not generally put a high enough value on the water to justify the infrastructure cost of transfer. The concepts of pipelines or tankers to transfer water from north and west to south and east in this country fall down when the financial calculations are done.
There are only two things that can be done to alleviate the situation; reducing demand or increasing supply and it is the matching of these two that holds the key. All three-supply,demand and balancing-require investment if you assume, as I do, that climatic patterns are shifting bringing us greater extremes and variations.

Increasing supply must start with the provision of more storage reservoirs to capture such rainfall as there is and to supplement aquifers. Well designed, these can benefit businesses, perhaps communities too and certainly wildlife as can any modern catch meadows or leats that flow from them( the Devon Wildlife Trust have tried to restore some)- but the construction of the reservoirs is often mired in red tape and they are expensive; fiscal incentives would help. Reducing demand in domestic situations is about behaviour change; in business situations it is about research and development into affordable alternatives. In farming, reducing the demand for food will hardly help us to achieve food security in a hungry world so this might mean drought resistant varieties. This re-opens the GM debate. Finally balancing these two requires anticipating rainfall and matching it with temperature and crop and animal requirements. This is about accurate forecasting which, once again, will need funding.
In Devon we once had catch meadows. Now we have the Met Office in Exeter. We need to play a full part in the debate.