13000000095 Santa Maria Dam Inundation Report

• Contract/PO #: 13000000095
• Contractor Name: Santa Maria Reservior Company
• Contract Type: Grant
• Water District: 20
• County: Hinsdale
• County: Mineral
• Loan Projects - Doc Type: Report

SANTA MARIA DAM - i - July 11, 2013
INUNDATION MAPPING REPORT
TABLE OF CONTENTS

Page

1.0 INTRODUCTION .................................................................................................................. 1

1.1 Location and Background ............................................................................................ 1

2.0 DAM BREACH ANALYSIS .................................................................................................. 1

2.1 Breach Parameter Estimation ....................................................................................... 1
2.2 Dam Breach Simulation in HEC-HMS ........................................................................ 3
2.3 Hydraulic Modeling in HEC-RAS ............................................................................... 4

3.0 INUNDATION EXTENTS ..................................................................................................... 5

3.1 Detail of Mapping ........................................................................................................ 5
3.2 Description of Inundation Area ................................................................................... 5

4.0 REFERENCES............. ........................................................................................................... 9

List of Tables

Table 1 Summary of Elevation Data
Table 2 Comparison of Dam Breach Parameters and Estimated Peak Outflows
Table 3 Summary of HEC-HMS Results Downstream of Santa Maria Dam
Table 4 Summary of HEC-RAS Results at Critical Sections

List of Appendices

Appendix A Data Sources
Appendix B Santa Maria Reservoir Elevation-Area-Capacity Curve
Appendix C Empirical Methods for Predicting Breach Parameters
Appendix D HEC-HMS Output
Appendix E Log-Pearson Type III Spreadsheet
Appendix F HEC-RAS Output
Appendix G Inundation Mapping