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TABLE OF CONTENTS <br /> Pa4e <br />SECTION 1: I9VTRODUCTION 1 <br />F'roject Description 1 <br />F'roject Purpose & Objectives 1 <br />F'revious Studies 2 <br />~-cope of the Current Study 3 <br />F~pplicability and Limitations of the Guidelines 3 <br />SECTION 2: IJNIT HYDROGRAPHS 5 <br />Unit Hydrograph Selection 5 <br />C:lark Unit Hydrograph Parameter Estimation 7 <br />Time of Concentration 7 <br />Storage Coefficient 10 <br />Time Area Relation 11 <br />C)imensionless Unit Hydrographs and Estimation of Lag 14 <br />Lag 14 <br />Kn for Rocky Mountain, Great Plains and Colorado Plateau Watersheds 15 <br />Kn for Agricultural Watersheds 20 <br />K~ for Urban Watersheds 21 <br />~~ummary Of Unit Hydrograph Selection And Recommended K„ Values 23 <br />Instructions 25 <br />Duration 27 <br />S~CTION 3: RAINFALL LOSSES 28 <br />C~reen & Ampt Infiltration Equation 28 <br />Introduction 28 <br />Applicability 28 <br />Method Description 28 <br />Surface Retention Loss, IA 35 <br />Effective Impervious Area, RTIMP 36 <br />19 March 2007 ~ <br />