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<br />. <br />~ <br />~ <br />~ <br />~ <br /> <br />u.s. DEPARTMENT OF TRANSPORTATION <br />FEDERAL HIGHWAY ADMINISTRATION <br /> <br />HYDRAULIC DESIGN OF HIGHWAY CULVERTS <br /> <br />I. INTRODUCTION <br /> <br />A. General. <br /> <br />~ <br />~ <br />l <br />~ <br /> <br />i <br /> <br />r <br />~ <br />i <br />~ <br />t <br />[ <br />J <br />~ <br />~ <br />~ <br />~ <br />t <br />,.. <br />; <br />~ <br />~ <br /> <br />The purpose of this publication is to <br />provide information for the planning and <br />hydraulic design of highway culverts and <br />inlet improvements for culverts. (figure <br />I-I) Design methods are included for <br />special shapes including long-span cul- <br />verts. (figure 1-2) Detailed informa- <br />tion is provided on the routing of flow <br />through culverts. Guidance and refer- <br />ence sources are furnished for environ- <br />mental, safety, structural, economic, <br />and other consideration. <br /> <br /> <br />Figure 1-1-- Typical concrete pipe culYert. <br /> <br />The check. lists, design charts and <br />tables, and calculation forms of this <br />publication should provide the designer <br />with the necessary tools to perform cul- <br />vert designs ranging from the most basic <br />culverts to more complex improved inlet <br />designs. Figure 1-3 is a flowchart of <br />the culvert design procedure followed in <br />this manual. <br /> <br /> <br />Figure I-2-Long span culvert. <br /> <br />The methodology of culvert design <br />presented in this publication is in a <br />clear, usable format. It is intended <br />for those with a good understanding of <br />basic hydrologic and hydraulic methods <br />and with some experience in the design <br />of hydraulic structures. The experi- <br />enced designer is assumed to be able to <br />understand the variety of flow condi- <br />tions which are possible in these com- <br />plex hydraulic structures and make ap- <br />propriate adjustments. The inexperienc- <br />ed designer and those unfamiliar with <br />hydraulic phenomena should use this publi- <br />cation with caution. <br /> <br />This publication combines the <br />information and methodology contained in <br />Hydraulic Engineering Circular (HEe) <br />Number S, Hvdraulic Charts for the <br />Selection of Hi2hwav Culverts. HEC <br />Number 10, CaDacitv Charts for the <br />Hvdraulic Desi2n of Hi2hwav Culverts. <br /> <br />I <br />