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<br />ABSTRACT <br /> <br />The main objective of this study is to develop an accurate design method for com~ <br />puting inlet hydrographs of surface runoff, with average recurrence intervals of 10, 25, <br />and 50 years, from typical urban highway by flood routing technique. <br /> <br />The boundary-value problem of one-dimensional infiltration resulting from rainfall <br />is formulated and solved numerically on a digital computer. The numerical solutions of <br />this idealized mathematical model is used as a basic testing tool in the subsequent analysis <br />of various parametric infiltration models including the Green-Ampt, Kostiakov, Philip, <br />Horton, and Holtan equations. The time of ponding is shown to be the most important <br />parameter in a parametric infiltration model and can be expressed in terms of other <br />parameters in the model as well as the rainfall intensity. The values of all the model <br />parameters are determined to be fairly constant for a soil having the same initial and <br />upper boundary (soil surface) conditions, Use of the Green-Ampt, Kostiakoy, and Philip <br />type models for the prediction of the infiltration rate before and after ponding is proved <br />to be satisfactory. For engineering practice, the standard infiltration-capacity curves for <br />soil-cover-moisture complexes representing urban highway sideslopes are empirically de- <br />veloped based on the unique selection of the Soil Conservation Service runoff curve num- <br />ber. Validity of typical standard curves so developed were experimentally examined in <br />the Utah Water Research Laboratory stormflow experiment facility, <br /> <br />Chen, C, L, Urban Storm Runoff Inlet Hydrograph Study: VoL 5, Soil.Cover. <br />Moisture Complex: Analysis of Parametric Infiltration Models for Highway Sideslopes, <br />Final Report, PRWGI06.5, Utah Water Research Laboratory, Utah State University, <br />Logan, Utah 84322, May 1975, <br /> <br />Key Words: Algebraic equations, Highway, Hydrologic soil groups, Hydrology, Infiltra. <br />tion, Infiltration capacity, Infiltration rate, Laboratory studies, Mathe. <br />matical models, Parametric models, Plant cover, Rain inmtration, Runoff <br />curve number, Sideslopes, Soils, Soil classifications, Soil moisture, Stan- <br />dard curve, Turf, Urban <br /> <br />iii <br />