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<br />PREFACE <br /> <br />The work described in this report was performed under contract DOT.FH.II.7806, <br />entitled "Urban Storm Runoff Inlet Hydrograph Study" between the Federal Highway <br />Administration and Utah State University, This research contract aimed at the <br />development of an accurate design method for computing inlet hydrographs of surface <br />runoff under intense rainstorms on urban highways. One of the major tasks of this <br />research project was the determination of the infiltration-capacity curves or the <br />infiltration relationships as related to soil.cover.moisture complexes representing highway <br />sidesIopes. The results obtained from this study were finally integrated into the general <br />surface-runoff model that was formulated in the analytical phase of the research project. <br /> <br />The research was conducted under the general supervision of Dr. Cheng-lung Chen, <br />Professor of Civil and Environmental Engineering at Utah State University, During this <br />study, Dr. Musa N, Nima, Post Doctoral Fellow at Utah Water Research Laboratory, <br />helped review literature on factors affecting infiltration and existing soil classifications. <br />Dr. George B, Shih, Research Engineer at Utah Water Research Laboratory, also helped <br />write a computer program for solving numerically the boundary-value problem of rain <br />infiltration, <br /> <br />The contract was monitored by Dr. D. C. Woo, Contract Manager, Environmental <br />Design and Control Division, Federal Highway Administration, The author is indebted to <br />Dr. Woo for his ideas contributed during the initial phase, and guidance throughout this <br />study, Numerous detailed discussions about the research were held with Dr. Woo during <br />all phases of the study, He also gave many critical reviews and comments of the results <br />during the course of work, <br /> <br />Special acknowledgments are due Dr, Lyman S, Willardson, Professor of Agricul. <br />tural and Irrigation Engineering, Dr. Roland W. Jeppson, Professor of Civil and <br />Environmental Engineering, Dr. Richard H. Hawkins, Associate Professor of Forest <br />Science, all at Utah State University for their reviews of and comments on the entire <br />manuscript and their valuable suggestions. <br /> <br />This volume is fifth in a series, The others in the series are: <br /> <br />VoL <br />No. <br /> <br />Title <br /> <br />UWRL <br />Report No, <br /> <br />PRWGl06.! <br /> <br />! <br /> <br />Computer Analysis of Runoff from Urban Highway Watersheds Under <br />Time- and Space-Varying Rainstorms <br /> <br />Laboratory Studies of the Resistance Coefficient for Sheet Flows over <br />Natural Turf Surfaces <br /> <br />Hydrologic Data for Two Urban Highway Watersheds in the Salt Lake <br />City Area, Utah <br /> <br />Synthetic Storms for Design of Urban Highway Drainage Facilities <br /> <br />PRWG 106.2 <br /> <br />2 <br /> <br />3 <br /> <br />PRWGl06.3 <br /> <br />4 <br /> <br />PRWG 106.4 <br /> <br />v <br />