12000000053 Highland No. 2 Dams Inundation Report

• Contract/PO #: 12000000053
• Contractor Name: Highland Ditch Company
• Contract Type: Grant
• Water District: 5
• County: Boulder
• Loan Projects - Doc Type: 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 2
2.3 Hydraulic Modeling in HEC-RAS 4
2.3.1 Hydraulics Downstream of Highland No. 2 North Dam 4
2.3.2 Hydraulics Downstream of Highland No. 2 South Dam 5
2.4 Results 5
3.0 INUNDATION EXTENTS 6
3.1 Detail of Mapping 6
3.2 Description of Inundation Area 7
3.2.1 Inundation Downstream of Highland No. 2 North Dam 7
3.2.2 Inundation Downstream of Highland No. 2 South Dam 7
4.0 REFERENCES 9
List of Tables
Table 1 Comparison of North Dam Breach Parameters Calculated Using Empirical Equations
Table 2 Comparison of South Dam Breach Parameters Calculated Using Empirical Equations
Table 3 Comparison of HEC-HMS Piping Simulation Results—North Dam
Table 4 Comparison of HEC-HMS Piping Simulation Results—South Dam
Table 5 Summary of HEC-HMS Results Downstream of Highland No. 2 North Dam
Table 6 Summary of HEC-HMS Results Downstream of Highland No. 2 South Dam
Table 7 Summary of HEC-RAS Results at Critical Sections—North Dam
Table 8 Summary of HEC-RAS Results at Critical Sections—South Dam
HIGHLAND No.2 NORTH AND SOUTH DAMS - 1 - June 15,2012
INUNDATION MAPPING REPORT