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El Vado Dam – Service Spillway Modification – Physical Model Study

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El Vado Dam – Service Spillway Modification – Physical Model Study Hydraulic Laboratory Report HL-2017-02 El Vado Dam – Service Spillway Modification – Physical Model Study U.S. Department of the Interior Bureau of Reclamation Technical Service Center Hydraulic Investigations and Laboratory Services Group Denver, Colorado April 2017 Form Approved REPORT DOCUMENTATION PAGE OMB No. 0704-0188 The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. 1. REPORT DATE (DD-MM-YYYY) 2. REPORT TYPE 3. DATES COVERED (From - To) 04-27-2017 Hydraulics Laboratory Report January 2016-January 2017 4. TITLE AND SUBTITLE 5a. CONTRACT NUMBER El Vado Dam – Service Spillway Modification - Physical NA Model Study 5b. GRANT NUMBER NA 5c. PROGRAM ELEMENT NUMBER NA 6. AUTHOR(S) 5d. PROJECT NUMBER NA Bryan J. Heiner 5e. TASK NUMBER Christopher C. Shupe NA 5f. WORK UNIT NUMBER NA 7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) 8. PERFORMING ORGANIZATION Bureau of Reclamation REPORT NUMBER PO Box 25007 HL-2017-02 Denver, CO 80225 9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR/MONITOR'S Bureau of Reclamation ACRONYM(S) USBR 11. SPONSOR/MONITOR'S REPORT NUMBER(S) NA 12. DISTRIBUTION/AVAILABILITY STATEMENT NA 13. SUPPLEMENTARY NOTES NA 14. ABSTRACT A 1:24-scale physical hydraulic model for the feasibility design (corrective action study preferred option) of the service spillway at El Vado Dam was constructed at Reclamation’s Hydraulics Laboratory in Denver, Colorado. The model examined hydraulic performance and optimized the feasibility design for the preferred option. Modifications include relocation of the spillway entrance 20 ft farther into the right abutment and realignment of the spillway with the existing spillway alignment by means of a long radius channel bend from approximately station 2+00 to 4+00. The features included in the physical model were approximately one third of the dam crest, the spillway entrance channel, gate structure, chute, and plunge pool in the downstream river channel. 15. SUBJECT TERMS 16. SECURITY CLASSIFICATION OF: 17. LIMITATION 18. 19a. NAME OF RESPONSIBLE PERSON OF ABSTRACT NUMBER OF PAGES 65 Robert F. Einhellig a. b. a. THIS PAGE 19b. TELEPHONE NUMBER REPORT ABSTRACT 303-445-2142 Standard Form 298 (Rev. 8/98) Prescribed by ANSI Std. Z39.18 Hydraulic Laboratory Report HL-2017-02 El Vado Dam – Service Spillway Modification – Physical Model Study Prepared: Bryan J. Heiner, P.E. Hydraulic Engineer, Hydraulic Investigations and Laboratory Services Group, 86-68560 Prepared: Christopher C. Shupe, E.I.T. Hydraulic Engineer, Hydraulic Investigations and Laboratory Services Group, 86-68560 Technical Approval: Robert F. Einhellig, P.E. Manager, Hydraulic Investigations and Laboratory Services Group, 86-68560 Peer Review: Joshua Mortensen, P.E. Date Hydraulic Engineer, Hydraulic Investigations and Laboratory Services Group, 86-68560 U.S. Department of the Interior Bureau of Reclamation Technical Service Center Hydraulic Investigations and Laboratory Services Group Denver, Colorado April 2017 Mission Statements The mission of the Department of the Interior is to protect and provide access to our Nation's natural and cultural heritage and honor our trust responsibilities to Indian Tribes and our commitments to island communities. ___________________________ The mission of the Bureau of Reclamation is to manage, develop, and protect water and related resources in an environmentally and economically sound manner in the interest of the American public. Acknowledgments The authors would like to thank Jason Black, Jimmy Hastings, Marty Poos and Dane Cheek who constructed the physical model. Hydraulic Laboratory Reports The Hydraulic Laboratory Report series is produced by the Bureau of Reclamation’s Hydraulic Investigations and Laboratory Services Group (Mail Code 86-68560), PO Box 25007, Denver, Colorado 80225-0007. At the time of publication, this report was also made available online at https://www.usbr.gov/tsc/techreferences/hydraulics_lab/reportsdb/reportsearchall.cfm Disclaimer The information provided in this report is believed to be appropriate and accurate for the specific purposes described herein, users bear all responsibility for exercising sound engineering judgment in its application, especially to situations different from those studied. References to commercial products do not imply endorsement by the Bureau of Reclamation and may not be used for advertising or promotional purposes. Cover Photo: El Vado Service Spillway Model taken in May 2016, Reclamation. CONTENTS EXECUTIVE SUMMARY .....................................................................................1 INTRODUCTION ...................................................................................................2 Project Background ..............................................................................................2 Prototype Operation .............................................................................................6 MODEL OBJECTIVES ...........................................................................................7 MODEL DESCRIPTION ........................................................................................7 Numerical Model .................................................................................................7 Physical Model Scale ...........................................................................................9 Physical Model Features ......................................................................................9 Physical Model Instrumentation ........................................................................14 MODEL TEST PLAN ...........................................................................................16 RESULTS AND DISCUSSION ............................................................................16 Numerical Model ...............................................................................................16 Physical Model ..................................................................................................18 Spillway Entrance Guide Walls .................................................................... 19 Transition Section between Vertical and Sloped Spillway Walls................. 24 Final Physical Model Modifications (Configuration “J”) ............................. 25 Downstream River Plunge Pool .................................................................... 26 Approach Channel Velocities ....................................................................... 28 Spillway Entrance Water Surface Profiles .................................................... 31 Spillway Chute Water Surface Profiles and Velocities ................................ 33 Rating Curves ................................................................................................ 38 Cavitation and Air Bulking ........................................................................... 41 CONCLUSIONS....................................................................................................42 REFERENCES ......................................................................................................44 APPENDIX A: FLOW-3D NUMERICAL MODEL CONFIGURATIONS .......45 APPENDIX B: SPILLWAY FLOW DEPTHS AND VELOCITY DATA..........52 TABLES Table 1. Approach channel velocities at 60% depth for flow rate of 5,000 ft3/s. .29 Table 2. Approach channel velocities at 20% depth for flow rate of 18,600 ft3/s. ................................................................................................................29 Table 3. Approach channel velocities at 60% depth for flow rate of 18,600 ft3/s. ................................................................................................................30 i Table 4. Approach channel velocities at 80% depth for flow rate of 18,600 ft3/s. ................................................................................................................31 Table 5. Water surface elevations through the approach channel, bridge and gate sections of the spillway. .................................................................................33 Table 6. Reservoir inflow rates and corresponding reservoir water surface elevations for various spillway entrance configurations tested in the physical model..............................................................................................................39 Table 7. Spillway chute flow depths and velocities for approach channel configuration “J” in prototype dimensions. ...................................................52 FIGURES Figure 1. El Vado Dam and Middle Rio Grande Project general location map. ....3 Figure 2. Photograph of broken vertical
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