Valencia's irrigation system is now a model for sustainable farming
This kind of irrigation is terrible if you are trying to conserve water.<p>As temperatures rise places that use aqueduct and flood irrigation will have to contend with the loss of water to evaporation during transport.<p>Fortunately people out on the American plains have this figured out and better technologies exist. The problem is convincing farmers and law makers in areas that have traditionally had abundances of water to change their ways.