OPTIMAL CONJUNCTIVE-USE OPERATIONS AND PLANS

Heuristic or intuitive rules based on experience may-not be efficient when applied to the management of water supply systems that contain bo th surface and subsurface storage. In particular, rules that assign su bsurface storage the role of a backup to surface storage do not recogn ize the different capabilities of surface and subsurface: storage. We demonstrate how to incorporate the different capabilities of surface a nd subsurface storage in appropriately cautious long-term control of c onjunctive-use systems. We also demonstrate how these results may be u sed to evaluate the benefit of adding groundwater supplies to an exist ing surface water supply system.