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Tri-Valley Local Hazard Mitigation Plan;Volume 1—Planning-Area-Wide Elements 4.6.3 Race,Ethnicity and Language 4-13 4.6.4 Individuals with Disabilities and Others with Access and Functional Needs 4-13 4.7 Economy 4-14 4.7.1 Income 4-14 4.7.2 Industry,Businesses and Institutions 4-15 4.7.3 Employment Trends and Occupations 4-16 4.8 Laws and Ordinances 4-17 4.8.1 Federal 4-17 4.8.2 State 4-23 4.8.3 Local 4-28 PART 2— RISK ASSESSMENT 5. Identified Hazards of Concern and Risk Assessment Methodology 5-1 5.1 Identified Hazards of Concern 5-1 5.2 Risk Assessment Tools 5-2 5.2.1 Mapping 5-2 5.2.2 Hazus 5-2 5.3 Risk Assessment Approach 5-3 5.3.1 Earthquake,Dam Failure,and Flood 5-3 5.3.2 Drought 5-4 5.3.3 Landslide, Severe Weather, Wildfire 5-4 5.4 Sources of Data Used in Hazus Modeling 5-4 5.4.1 Building,Land Use and Cost Data 5-4 5.4.2 Hazus Data Inputs 5-4 5.4.3 Other Local Hazard Data 5-4 5.4.4 Data Source Summary 5-5 5.5 Limitations 5-5 6. Dam Failure 6-1 6.1 General Background 6-1 6.1.1 Causes of Dam Failure 6-1 6.1.2 Regulatory Oversight 6-2 6.2 Hazard Profile 6-4 6.2.1 Past Events 6-4 6.2.2 Location 6-4 6.2.3 Frequency 6-6 6.2.4 Severity 6-6 6.2.5 Warning Time 6-6 6.3 Secondary Hazards 6-7 6.4 Exposure 6-7 6.4.1 Population 6-7 6.4.2 Property 6-7 6.4.3 Critical Facilities 6-8 6.4.4 Environment 6-8 6.5 Vulnerability 6-8 6.5.1 Population 6-8 6.5.2 Property 6-8 6.5.3 Critical Facilities 6-9 6.5.4 Environment 6-9 vi TETRA TECH