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Highway culverts are installed to safely drain the design peak runoff and the dimensions are to be determined based on the estimated design peak runoff and hydraulic computations. The critical storm duration and peak discharge according to the rainfall distribution type, the position of peak rainfall intensity, and frequency were evaluated by seven hydrological models. The hydrological models were tested with field data measured from two small watersheds. The hydrological parameters were defined using the GIS data of the watersheds. And the results from different peak runoff equations and hydrological models were found that the simulated for runoff hydrographs were comparative to the observed hydrographs. Hydraulic designs of highway culverts, thirty five drainage watersheds along renovating segments of Highway No. 39 in Korea, were studied to define the optimum dimensions and hydraulic variables for the design peak runoff. This study may also be applicable to the design of highway drainage systems for areas with future and postulated land uses and new development.