This chapter argues that, to achieve the expected outcomes, designers and negotiators need to jointly consider both the physical and contractual arrangements of a project. The reasoning is:
(1) The future outcomes of any project are uncertain because of inescapable changes in needs, supplies, costs, and technologies.
(2) Contractual arrangements inevitably allocate these outcomes differentially between water suppliers and end users—largely, but not only, because their costs and benefits occur unevenly over time.
(3) Designers will shape the project in response to the risks associated with the contracts, which may not be best from the overall societal perspective.