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This Technical Note describes the use of a BASIC computer program to aid the hydrologist (and other specialists involved in water projects) in the calculation of design peak flows, evaluation of hydrologic risk, and selection of circular culverts. The program is written for the sizing of circular culverts at forest road crossings, but may be extended to other applications such as bridges, watershed management projects, and other uses where the calculation of design events and hydrologic risk is needed. A discussion of each subject is included in the text, with instructions on how to use the program. Example problems are used to illustrate the program.