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Suggested Citation:"Front Matter." National Academies of Sciences, Engineering, and Medicine. 2023. Resilient Design with Distributed Rainfall-Runoff Modeling. Washington, DC: The National Academies Press. doi: 10.17226/27051.
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Suggested Citation:"Front Matter." National Academies of Sciences, Engineering, and Medicine. 2023. Resilient Design with Distributed Rainfall-Runoff Modeling. Washington, DC: The National Academies Press. doi: 10.17226/27051.
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Suggested Citation:"Front Matter." National Academies of Sciences, Engineering, and Medicine. 2023. Resilient Design with Distributed Rainfall-Runoff Modeling. Washington, DC: The National Academies Press. doi: 10.17226/27051.
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Suggested Citation:"Front Matter." National Academies of Sciences, Engineering, and Medicine. 2023. Resilient Design with Distributed Rainfall-Runoff Modeling. Washington, DC: The National Academies Press. doi: 10.17226/27051.
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Suggested Citation:"Front Matter." National Academies of Sciences, Engineering, and Medicine. 2023. Resilient Design with Distributed Rainfall-Runoff Modeling. Washington, DC: The National Academies Press. doi: 10.17226/27051.
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Suggested Citation:"Front Matter." National Academies of Sciences, Engineering, and Medicine. 2023. Resilient Design with Distributed Rainfall-Runoff Modeling. Washington, DC: The National Academies Press. doi: 10.17226/27051.
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Suggested Citation:"Front Matter." National Academies of Sciences, Engineering, and Medicine. 2023. Resilient Design with Distributed Rainfall-Runoff Modeling. Washington, DC: The National Academies Press. doi: 10.17226/27051.
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Suggested Citation:"Front Matter." National Academies of Sciences, Engineering, and Medicine. 2023. Resilient Design with Distributed Rainfall-Runoff Modeling. Washington, DC: The National Academies Press. doi: 10.17226/27051.
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Below is the uncorrected machine-read text of this chapter, intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text of each book. Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages.

2023 Resilient Design with Distributed Rainfall-Runoff Modeling A Synthesis of Highway Practice Jose G. Vasconcelos Xing Fang Vitor Gustavo Geller Gianlucca Giovanni Nicolaico Esthefany Mejia Reyes Highway Research Center Department of Civil and Environmental Engineering Auburn University Auburn, AL Research sponsored by the American Association of State Highway and Transportation Ofcials in cooperation with the Federal Highway Administration Subscriber Categories Highways • Environment • Hydraulics and Hydrology N A T I O N A L C O O P E R A T I V E H I G H W A Y R E S E A R C H P R O G R A M NCHRP SYNTHESIS 602

Published reports of the NATIONAL COOPERATIVE HIGHWAY RESEARCH PROGRAM are available from Transportation Research Board Business Office 500 Fifth Street, NW Washington, DC 20001 and can be ordered through the Internet by going to https://www.mytrb.org/MyTRB/Store/default.aspx Printed in the United States of America NCHRP SYNTHESIS 602 Project 20-05, Topic 53-11 ISSN 0547-5570 ISBN 978-0-309-69861-0 Library of Congress Control Number 2023936485 © 2023 by the National Academy of Sciences. National Academies of Sciences, Engineering, and Medicine and the graphical logo are trade- marks of the National Academy of Sciences. All rights reserved. COPYRIGHT INFORMATION Authors herein are responsible for the authenticity of their materials and for obtaining written permissions from publishers or persons who own the copyright to any previously published or copyrighted material used herein. Cooperative Research Programs (CRP) grants permission to reproduce material in this publication for classroom and not-for-profit purposes. Permission is given with the understanding that none of the material will be used to imply TRB, AASHTO, APTA, FAA, FHWA, FTA, GHSA, or NHTSA endorsement of a particular product, method, or practice. It is expected that those reproducing the material in this document for educational and not-for-profit uses will give appropriate acknowledgment of the source of any reprinted or reproduced material. For other uses of the material, request permission from CRP. Cover figure: Watershed delineation of the Little Cahaba Creek in Trussville, AL, to study the hydrological and water quality effects of Interstate 59 (Vasconcelos et al. 2016). NOTICE The report was reviewed by the technical panel and accepted for publication according to procedures established and overseen by the Transportation Research Board and approved by the National Academies of Sciences, Engineering, and Medicine. The opinions and conclusions expressed or implied in this report are those of the researchers who performed the research and are not necessarily those of the Transportation Research Board; the National Academies of Sciences, Engineering, and Medicine; the FHWA; or the program sponsors. The Transportation Research Board does not develop, issue, or publish standards or spec- ifications. The Transportation Research Board manages applied research projects which provide the scientific foundation that may be used by Transportation Research Board sponsors, industry associations, or other organizations as the basis for revised practices, procedures, or specifications. The Transportation Research Board; the National Academies of Sciences, Engineering, and Medicine; and the sponsors of the National Cooperative Highway Research Program do not endorse products or manufacturers. Trade or manufacturers’ names or logos appear herein solely because they are considered essential to the object of the report. NATIONAL COOPERATIVE HIGHWAY RESEARCH PROGRAM Systematic, well-designed, and implementable research is the most effective way to solve many problems facing state departments of transportation (DOTs) administrators and engineers. Often, highway problems are of local or regional interest and can best be studied by state DOTs individually or in cooperation with their state universities and others. However, the accelerating growth of highway transporta- tion results in increasingly complex problems of wide interest to high- way authorities. These problems are best studied through a coordinated program of cooperative research. Recognizing this need, the leadership of the American Association of State Highway and Transportation Officials (AASHTO) in 1962 ini- tiated an objective national highway research program using modern scientific techniques—the National Cooperative Highway Research Program (NCHRP). NCHRP is supported on a continuing basis by funds from participating member states of AASHTO and receives the full cooperation and support of the Federal Highway Administration (FHWA), United States Department of Transportation, under Agree- ment No. 693JJ31950003. The Transportation Research Board (TRB) of the National Academies of Sciences, Engineering, and Medicine was requested by AASHTO to administer the research program because of TRB’s recognized objectivity and understanding of modern research practices. TRB is uniquely suited for this purpose for many reasons: TRB maintains an extensive com- mittee structure from which authorities on any highway transportation subject may be drawn; TRB possesses avenues of communications and cooperation with federal, state, and local governmental agencies, univer- sities, and industry; TRB’s relationship to the National Academies is an insurance of objectivity; and TRB maintains a full-time staff of special- ists in highway transportation matters to bring the findings of research directly to those in a position to use them. The program is developed on the basis of research needs iden- tified by chief administrators and other staff of the highway and transportation departments, by committees of AASHTO, and by the FHWA. Topics of the highest merit are selected by the AASHTO Special Committee on Research and Innovation (R&I), and each year R&I’s recommendations are proposed to the AASHTO Board of Direc- tors and the National Academies. Research projects to address these topics are defined by NCHRP, and qualified research agencies are selected from submitted proposals. Administration and surveillance of research contracts are the responsibilities of the National Academies and TRB. The needs for highway research are many, and NCHRP can make significant contributions to solving highway transportation problems of mutual concern to many responsible groups. The program, however, is intended to complement, rather than to substitute for or duplicate, other highway research programs.

e National Academy of Sciences was established in 1863 by an Act of Congress, signed by President Lincoln, as a private, non- governmental institution to advise the nation on issues related to science and technology. Members are elected by their peers for outstanding contributions to research. Dr. Marcia McNutt is president. e National Academy of Engineering was established in 1964 under the charter of the National Academy of Sciences to bring the practices of engineering to advising the nation. Members are elected by their peers for extraordinary contributions to engineering. Dr. John L. Anderson is president. e National Academy of Medicine (formerly the Institute of Medicine) was established in 1970 under the charter of the National Academy of Sciences to advise the nation on medical and health issues. Members are elected by their peers for distinguished contributions to medicine and health. Dr. Victor J. Dzau is president. e three Academies work together as the National Academies of Sciences, Engineering, and Medicine to provide independent, objective analysis and advice to the nation and conduct other activities to solve complex problems and inform public policy decisions. e National Academies also encourage education and research, recognize outstanding contributions to knowledge, and increase public understanding in matters of science, engineering, and medicine. Learn more about the National Academies of Sciences, Engineering, and Medicine at www.nationalacademies.org. e Transportation Research Board is one of seven major programs of the National Academies of Sciences, Engineering, and Medicine. e mission of the Transportation Research Board is to provide leadership in transportation improvements and innovation through trusted, timely, impartial, and evidence-based information exchange, research, and advice regarding all modes of transportation. e Board’s varied activities annually engage about 8,000 engineers, scientists, and other transportation researchers and practitioners from the public and private sectors and academia, all of whom contribute their expertise in the public interest. e program is supported by state transportation departments, federal agencies including the component administrations of the U.S. Department of Transportation, and other organizations and individuals interested in the development of transportation. Learn more about the Transportation Research Board at www.TRB.org.

CRP STAFF FOR NCHRP SYNTHESIS 602 Christopher J. Hedges, Director, Cooperative Research Programs Waseem Dekelbab, Deputy Director, Cooperative Research Programs, and Manager, National Cooperative Highway Research Program Jo Allen Gause, Senior Program Officer Emi Carbray, Program Coordinator Natalie Barnes, Director of Publications Heather DiAngelis, Associate Director of Publications NCHRP PROJECT 20-05 PANEL Joyce N. Taylor, Maine Department of Transportation, Augusta, ME (Chair) Melissa Batula, Pennsylvania Department of Transportation, Harrisburg, PA Anita K. Bush, Nevada Department of Transportation, Carson City, NV Joseph D. Crabtree, Kentucky Transportation Center (retired), Lexington, KY Mostafa Jamshidi, Nebraska Department of Transportation, Lincoln, NE Jessie X. Jones, Arkansas Department of Transportation, Little Rock, AR Brenda Moore, North Carolina Department of Transportation (retired), Cary, NC Cynthia J. Smith, Mississippi Department of Transportation, Jackson, MS Brian Worrel, Iowa Department of Transportation, Ames, IA Jack D. Jernigan, FHWA Liaison Jim T. McDonnell, AASHTO Liaison Stephen F. Maher, TRB Liaison TOPIC 53-11 PANEL Kyle Brandon, Ohio Department of Transportation, Columbus, OH Jennifer G. Duan, University of Arizona, Tucson, AZ Charles S. Hebson, Maine Department of Transportation, Augusta, ME Julie Heilman, Washington State Department of Transportation, Olympia, WA Roger Kilgore, Kilgore Consulting and Management, Denver, CO Matthew (Matt) S. Lauffer, North Carolina Department of Transportation, Raleigh, NC Stephen M. Sisson, Delaware Department of Transportation, Dover, DE Luis Vazquez, Georgia Department of Transportation, Atlanta, GA Daniel Steven Sharar-Salgado, FHWA Liaison Nancy M. Whiting, TRB Liaison C O O P E R A T I V E R E S E A R C H P R O G R A M S

ABOUT THE NCHRP SYNTHESIS PROGRAM Highway administrators, engineers, and researchers often face problems for which information already exists, either in documented form or as undocumented experience and practice. This infor- mation may be fragmented, scattered, and unevaluated. As a consequence, full knowledge of what has been learned about a problem may not be brought to bear on its solution. Costly research findings may go unused, valuable experience may be overlooked, and due consideration may not be given to recommended practices for solving or alleviating the problem. There is information on nearly every subject of concern to highway administrators and engineers. Much of it derives from research or from the work of practitioners faced with problems in their day- to-day work. To provide a systematic means for assembling and evalu ating such useful information and to make it available to the entire highway community, the American Association of State High- way and Transportation Officials—through the mechanism of the National Cooperative Highway Research Program—authorized the Transportation Research Board to undertake a continuing study. This study, NCHRP Project 20-05, “Synthesis of Information Related to Highway Practices,” searches out and synthesizes useful knowledge from all available sources and prepares concise, documented reports on specific topics. Reports from this endeavor constitute an NCHRP report series, Synthesis of Highway Practice. This synthesis series reports on current knowledge and practice, in a compact format, without the detailed directions usually found in handbooks or design manuals. Each report in the series provides a compendium of the best knowledge available on those measures found to be the most successful in resolving specific problems. FOREWORD By Jo Allen Gause Staff Officer Transportation Research Board Distributed rainfall-runoff modeling is a relatively new type of hydrologic modeling approach that divides the watershed under study into smaller spatial elements. Within each element, different hydro- logical processes are represented, which enables more detailed and accurate representation of runoff formation, transport, and accumulation. This synthesis documents current state department of trans- portation (DOT) practice related to the use of distributed rainfall-runoff models (DRRMs). Information for this study was gathered through a literature review, a survey of state DOTs, and follow-up interviews with selected DOTs. Case examples of four state DOTs provide additional infor- mation on the application of DRRMs in the context of roadway design. Jose G. Vasconcelos, Xing Fang, Vitor Gustavo Geller, Gianlucca Giovanni Nicolaico, and Esthefany Mejia Reyes, Highway Research Center, Auburn University, collected and synthesized the information and wrote the report. The members of the topic panel are acknowledged on page iv. This synthesis is an immediately useful document that records practices that were acceptable within the limitations of the knowledge available at the time of its preparation.

1 Summary 4 Chapter 1 Introduction 4 Definitions 5 Background 5 Synthesis Objective 6 Study Approach and Report Organization 8 Chapter 2 Literature Review 8 Background of Hydrological Modeling and DRRMs 9 Types of DRRMs and Key Model Components 12 Advantages of DRRMs over Lumped Approaches 13 Representative DRRMs with a Brief Model Description 20 State Agency Hydrologic Design Manuals 20 Other State and Federal Studies Applying DRRMs 20 Summary of the Literature Review 30 Chapter 3 Survey of State Practices for Distributed Rainfall-Runoff Modeling 30 Questionnaire Rationale 30 Current Status of DRRM Use: Questions 2–5 32 Factors Determining the Use of DRRMs in Hydrological Design: Questions 6–9 38 Characteristics of DRRM Implementation Within Agencies: Questions 10–18 46 Assessing Costs and Benefits of DRRMs 46 Barriers for Implementation of DRRMs 48 Chapter 4 Case Examples 48 North Carolina Department of Transportation 53 Kentucky Transportation Cabinet 57 California Department of Transportation 61 Texas Department of Transportation 64 Summary of the Case Examples 66 Chapter 5 Summary of Findings 67 Barriers for DRRM Implementation in State DOTs 67 Suggested Future Research 68 References 73 Abbreviations and Acronyms 75 Appendix A Blank Survey Questionnaire 91 Appendix B Survey Questions and Results C O N T E N T S

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The increased frequency of extreme rainfall events, inland and coastal flooding, and other water-related stressors poses challenges to roadway infrastructure.

The TRB National Cooperative Highway Research Program's NCHRP Synthesis 602: Resilient Design with Distributed Rainfall-Runoff Modeling documents the practices of state departments of transportation on the use of DRRMs and identifies state DOTs that have adopted DRRMs and the context in which these models are applied.

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