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Comprehensive Drainage Study of the Upper Reach of College Branch in Fayetteville, Arkansas Kathryn Lea Mccoy University of Arkansas, Fayetteville

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Comprehensive Drainage Study of the Upper Reach of College Branch in Fayetteville, Arkansas Kathryn Lea Mccoy University of Arkansas, Fayetteville University of Arkansas, Fayetteville ScholarWorks@UARK Theses and Dissertations 12-2012 Comprehensive Drainage Study of the Upper Reach of College Branch in Fayetteville, Arkansas Kathryn Lea McCoy University of Arkansas, Fayetteville Follow this and additional works at: http://scholarworks.uark.edu/etd Part of the Hydraulic Engineering Commons Recommended Citation McCoy, Kathryn Lea, "Comprehensive Drainage Study of the Upper Reach of College Branch in Fayetteville, Arkansas" (2012). Theses and Dissertations. 650. http://scholarworks.uark.edu/etd/650 This Thesis is brought to you for free and open access by ScholarWorks@UARK. It has been accepted for inclusion in Theses and Dissertations by an authorized administrator of ScholarWorks@UARK. For more information, please contact [email protected], [email protected]. COMPREHENSIVE DRAINAGE STUDY OF THE UPPER REACH OF COLLEGE BRANCH IN FAYETTEVILLE, ARKANSAS COMPREHENSIVE DRAINAGE STUDY OF THE UPPER REACH OF COLLEGE BRANCH IN FAYETTEVILLE, ARKANSAS A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Civil Engineering By Kathryn Lea McCoy University of Arkansas Bachelor of Science in Biological Engineering, 2009 December 2012 University of Arkansas ABSTRACT College Branch is a stream with headwaters located on the University of Arkansas campus. The stream flows through much of the west side of campus, gaining discharge and enlarging its channel as it meanders to the south. College Branch has experienced erosion and flooding issues in recent years due to increased urbanization of its watershed and increased runoff volume. The purpose of this project was to develop a comprehensive drainage study of College Branch on the University of Arkansas campus. Storm runoff and flood flow patterns were evaluated in order to understand the hydraulics and hydrology of the watershed and identify problem areas associated with excess runoff during storm events, including flooding and stream bank erosion. In addition to an evaluation of the present watershed, the study included proposed designs for changes to the stream channel, its banks, and areas surrounding the stream and in its watershed that could alleviate the amount of runoff during storms, stabilize the banks of the stream, and protect College Branch and its watershed from future destabilization. The availability of a comprehensive drainage study for the University of Arkansas reach of College Branch allows the university to make more-informed decisions concerning the current state of College Branch and the future development of its watershed. This thesis is approved for recommendation to the Graduate Council. Thesis Director: ______________________________________ Dr. Findlay G. Edwards Thesis Committee: ______________________________________ Dr. Brian Haggard _____________________________________ Dr. Rodney Williams THESIS DUPLICATION RELEASE I hereby authorize the University of Arkansas Libraries to duplicate this thesis when needed for research and/or scholarship. Agreed ___________________________________________ Kathryn Lea McCoy Refused ___________________________________________ Kathryn Lea McCoy ACKNOWLEDGEMENTS The author would like to thank her advisor, Dr. Edwards, for his commitment to helping in the completion of this thesis, and for his patience. She would also like to thank her committee for dedicating their time to reviewing and helping finalize this body of work. She would also like to recognize her employer, FTN Associates, LTD., for use of their resources, making portions of this research possible. In addition, the author would like to give a great thanks to her husband Jesse and sister Sarah for offering their time doing housework and watching the baby to allow the author to dedicate extra time to putting the final touches on this report. TABLE OF CONTENTS 1. INTRODUCTION ................................................................................................................... 1 1.1 Research Purpose ............................................................................................................... 1 1.2 Site Description .................................................................................................................. 1 2. LITERATURE REVIEW ........................................................................................................15 2.1. Urban Drainage Studies ....................................................................................................15 2.2. Urbanization ......................................................................................................................15 2.3. Runoff Analysis ................................................................................................................17 2.3.1. NRCS Method .........................................................................................................18 2.3.2. Rational Method ......................................................................................................21 2.3.3. Other Statistical Methods ........................................................................................22 2.3.4. Gage Stations ...........................................................................................................24 2.3.5. Log-Pearson Type III Frequency Analysis .............................................................24 2.4. Controlling Stormwater Runoff ........................................................................................25 2.5. Stormwater Detention Design ..........................................................................................27 2.5.1. Loss-of-Natural-Storage Method ............................................................................28 2.5.2. Rational Formula Hydrograph Method ...................................................................28 2.5.3. SCS TR-55 Method .................................................................................................29 2.5.4. Stormwater Storage Alternatives .............................................................................29 2.6. Army Corps of Engineers Hydraulic Engineering Center Stormwater Modeling ...........30 2.7. Stream Restoration ...........................................................................................................32 2.7.1. Stream Restoration Methods ...................................................................................33 2.7.1.1. Rosgen Method ..........................................................................................33 2.7.1.2. Other Stream Design Methods ...................................................................35 2.7.2. Stream Restoration Techniques and Structures .......................................................37 2.8. Preview Studies on College Branch .................................................................................40 2.8.1. University of Arkansas Community Design Center ................................................40 2.8.2. Undergraduate Study using ArcGIS ........................................................................40 2.8.3. Undergraduate Conceptual Design for Stream Stabilization ..................................41 3. METHODOLOGY ..................................................................................................................42 3.1. Runoff Analysis ................................................................................................................42 3.1.1. NRCS Method .........................................................................................................45 3.1.2. NSS Program Flood Frequency Analysis ...............................................................49 3.1.3. Gage Station Runoff Analysis ................................................................................50 3.1.4. HEC-HMS Model ...................................................................................................50 3.1.5. Design Runoff Determination .................................................................................53 3.2. Storage Design .................................................................................................................56 3.2.1. College Branch Watershed Conditions Determination for Time Periods ...............57 3.2.2. College Branch Watershed Conditions Determination for Development Types ....61 3.2.3. General Storage Method .........................................................................................62 3.2.4. Loss-of-Natural-Storage Method ............................................................................64 3.2.5. Design Volume Determination ...............................................................................65 3.3. Stream Rehabilitation.......................................................................................................68 3.3.1. Two Stage Channel Design .....................................................................................69 3.3.2. Two Stage Channel Analysis ..................................................................................75 3.3.3. Bank Protection and Stabilization ...........................................................................75 3.3.4. Storage Design ........................................................................................................80 4. RESULTS AND DISCUSSION ..............................................................................................84 4.1. Project Objectives ......................................................................................................84
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