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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 />Knowledge of the time distribution of rainfall in heavy storms constitutes a basis <br />for the design of an urban storm sewer system. A unified time-coordinate system and the <br />rainfall intensity-duration-frequency relationships are used to develop the generalized <br />synthetic (design) hyetograph equations for all types of storms. The hyetograph equa- <br />tions are further normalized for identifying the dimensionless parameters that play pre- <br />dominant roles in the formulation of a design storm pattern. The method of least squares <br />and an optimization technique are applied to the evaluation of the storm parameters <br />through the use of the rainfall intensity-duration-frequency maps in the U,S. Weather <br />Bureau Technical Paper No. 40. It is found that the parameter evaluation method can <br />greatly be simpiified by establishing reiationships among the storm parameters, However, <br />an analysis of avaiiable actual hyetographs faiied to establish any relationships between <br />the storm skewness and the other storm parameters. <br /> <br />Chen, C. L., Urban Storm Runoff Inlet Hydrograph Study: Vol. 4. Synthetic <br />Storms for Design of Urban Highway Drainage. Final Report, PRWG 106-4, Utah Water <br />Research Laboratory, Utah State University, Logan, Utah 84322, May 1975, <br /> <br />Key Words: Desgin, Drainage, Equation, Frequency, Highways, Hydrology, Hyeto- <br />graphs, Inlets, Intensity~duration curves, Rainfall, Runoff, Sewers, Storm <br />patterns, Storms, Urban <br /> <br />Hi <br />