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• Repr~ducibility - is a characteristic that provides reasonable confidence that <br />consistent results will be achieved by all qualified users. Reproducibility is highly <br />desirable for a design standard in order to eliminate - to the extent reasonable - <br />unnecessary conflicts over the interpretation and application of the design <br />method. Reproducibility is achieved through clear and concise procedures, user <br />guidance, and relevant training. <br />It is recommended that accuracy of these procedures be assessed by performing verification <br />studies using the recommended guidelines for gaged watersheds with a long period of high <br />qualiry runoff data to statistically estimate the magnitude of the 100-year peak discharge for <br />the watershed. The recommended procedures would then be applied to that watershed to <br />estimate the 100-year flood and those rainfall-runoff model results compared to the <br />stati~>tical estimate of the flood magnitude. Verification was accomplished for two <br />wate;rsheds in Colorado. Due to the diversity of Colorado watershed and hydrologic <br />conditions, additional verification studies should be performed. <br />The procedures meet the state-of-the-practice for IDF hydrology and make use of readily <br />available data and information sources. The compilation data and use of current <br />information is presented herein and is illustrated by examples to achieve the practicality <br />test. <br />The guidelines have attempted to provide clear and concise instructions so that qualified <br />user:~ will achieve consistent and uniform results. <br />Previous Studies <br />The Hydrologic Basin Response Study is a follow-on to the Seminar on Flood Hydrology: <br />RairrFall Losses and Unit Hydrograph Lag Equation that was conducted for the Office of the <br />StatE~ Engineer by George V. Sabol Consulting Engineers, Inc. in December 1994. During <br />that one day seminar, data sources for estimating rainfall losses and unit hydrograph lag <br />were~ presented. A set of seminar notes was provided with data sources and relevant <br />refer~ence material. <br />19 March 2007 2 <br />