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<br />~. <br />, <br />, <br />ii. <br />~; <br />~- <br />f <br /> <br />generally all that's needed to estimate surface runoff with these models. Conceptual models <br />attempt to provide a more physically-based approach to basin modeling by more explicitly <br />accounting for evapotranspiration, interception storage, retention storage, infiltration, surface <br />rumoff, percolation, interflow, etc. <br /> <br />The choice of models in specific situations remains difficult. After all the analysis of which model <br />performs the best for a given basin, it ultimately depends upon the capabilities and resources of <br />local users. Complex models requiring a high level of support might be appropriate in cases <br />where local skills and resources can handle it. However, the sarne model may be entirely <br />inappropriate in situations with lower levels oflocal hydrologic skill and resources. <br /> <br />To summarize model selection: <br /> <br />. Choose a model that is within the capabilities of the: local user to understand, <br />operate and maintain, <br /> <br />. Choose a model that is appropriate for the local hydrologic regime, and <br /> <br />. Choose a model that will provide the best estimate of the rising limb, the time to <br />peak, and the flood peak. <br /> <br />~ <br />~: <br /> <br />Finally no matter what model is chosen, remember: "Get the rainfall right first!" <br /> <br />~. <br />, <br />. <br /> <br />David C. Curtis, Ph.D., DC Consulting, 9477 Greenback Lane, #522A, Folsom, Califoruia 95630, Tel. <br />(916) 988-2771 <br />