A comparative analysis of several synthetic unit hydrographs estimation procedures are presented. This analysis is done by applying all methodologies to the same watershed and, in some cases, by using observed watersheds hydrographs and results obtained with others procedures. The comparative analysis used several indexes to describe direct runoff hydrographs and the similarities between computed and observed hydrographs. For the comparative analysis results reported in several thesis at the School of Mines, National University of Colombia, and in several papers were also used. Results shows great differences between all methodologies, and when comparisons were made with measured hydrographs the best results were obtained with the Williams and Hann Synthetic Unit Hydrograph model. Some conclusions and recommendations are finally presented.