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SECTION 1: INTRODUCTION <br />Proi~ect Descria~ion <br />The 1lydrolgic Basin Response Study was performed for the State of Colorado, Office of the <br />StatE~ Engineer, Dam Safety Branch, Division of Water Resources, Department of Natural <br />Resources. The project is to provide guidance and data sources for the performance of <br />inflo~N design flood (IDF) hydrology studies for dam safety and dam design. Of particular <br />inter~~st to this study are the estimation of rainfall loss and unit hydrograph parameters that <br />are riecessary in rainfall-runoff modeling for the purpose of determining IDF hydrographs. <br />Po~oiect Puruose and Obiectives <br />The purpose of this project is to investigate and document the use of data and information <br />that are available to estimate watershed parameters for use in IDF studies. Guidelines and <br />proa:dures are presented that, when used by engineers and hydrologist with appropriate <br />training and relevant experience, will produce consistent and reasonable IDF hydrographs <br />for dam safety studies in Colorado. <br />Thre~e (3) criteria were applied in developing the guidelines; accuracy, practicality and <br />reproducibility. <br />• Accuracy - is a measure of how well the results of the procedure reproduce the <br />physical process being simulated. Although accuracy is highly desired, absolute <br />accuracy is theoretically impossible to achieve in an earth science such as <br />hydrology, and in a practical sense, accuracy is not feasible to assess except for <br />a few situations where adequate verification data are available. <br />• Practicality - is a user's decision regarding the best and most appropriate level <br />of technology to apply considering the information that is available, anticipated <br />user, consequences of error, and desired or required output. <br />19 March 2007 <br />