This manual documents Version 4.6 of HEC-2, released February 1991. Appendices provide sample applications, floodway options, bridge and culvert analysis. Input, output, and special notes are also presented in the Appendices.

The report is basically a source book for individuals who are actually concerned with the problem of constructing alternative plans for developing urban areas. It reviews the methods and computer models that are currently available to the planner or engineer for developing water and related land resources. These reviews discuss the availability and usefulness of several models; give a brief technical description of each model, including the input data required; and indicate the amount and type of computer hardware needed to use each model. The report is directed mainly toward water related problems. Thus, most of the methods discussed deal with urban drainage, wastewater management, flood routing, reservoir operation, water supply, flood zoning, and the social and economic aspects associated with these areas. (Modified author abstract).