This manual is intended to provide guidance to field offices for the management of water control projects or systems that have been authorized by Congress and planned, designed and constructed by the Corps of Engineers. It also applies to certain aspects of water control projects constructed by other agencies or entities. Technical procedures used in the planning and design of Corps of Engineers projects are well documented in regulations and manuals, and they are done in accordance with established authority. Management of these systems for water control, however, requires special techniques beyond those used in the planning, design and construction phases, to analyze and regulate water conditions at individual projects in order to meet water management objectives.