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ASCE/SEI Standard 24-24 Flood Resistant Design and Construction, 2025
- ASCE/SEI24-24 Flood Resistant Design and Construction
- CONTENTS
- PREFACE
- ACKNOWLEDGMENTS
- CHAPTER 1: GENERAL [Go to Page]
- 1.1 Scope
- 1.2 Definitions [Go to Page]
- 1.2.1 Acronyms, Symbols, and Notation
- 1.3 Identification of Flood Hazard Areas
- 1.4 Identification of Flood-Prone Structures [Go to Page]
- 1.4.1 General
- 1.4.2 Consideration for Flood Protective Works
- 1.4.3 Assignment of Flood Design Class to Buildings and Structures [Go to Page]
- 1.4.3.1 Multiple Flood Design Classes
- 1.5 Basic Design and Construction Requirements [Go to Page]
- 1.5.1 General
- 1.5.2 Elevation Requirements [Go to Page]
- 1.5.2.1 FEMRI Determination for Flood Hazard Areas with Noncoastal Flood Sources
- 1.5.2.2 FEMRI Determination for Flood Hazard Areas with Coastal Flood Sources
- 1.5.2.3 Sea Level Change for Coastal Flood Sources
- 1.5.3 Foundation Requirements [Go to Page]
- 1.5.3.1 Geotechnical Considerations
- 1.5.3.2 Foundation Depth
- 1.5.3.3 Foundation Walls and Wall Footings
- 1.5.3.4 Columns or Piles
- 1.5.4 Use of Fill
- 1.5.5 Anchorage and Connections
- 1.6 Loads in Flood Hazard Areas [Go to Page]
- 1.6.1 General
- 1.6.2 Combination of Loads
- CHAPTER 2: BASIC REQUIREMENTS FOR FLOOD HAZARD AREAS THAT ARE NOT IDENTIFIED AS COASTAL HIGH HAZARD AREAS AND COASTAL A ZONES [Go to Page]
- 2.1 Scope
- 2.2 Development in Floodways
- 2.3 Elevation Requirements
- 2.4 Use of Fill [Go to Page]
- 2.4.1 Structural Fill
- 2.5 Slabs-on-Ground [Go to Page]
- 2.5.1 Use of Slabs-on-Ground
- 2.5.2 Elevating Slabs-on-Ground
- 2.6 Foundation Design
- 2.7 Foundation Walls
- 2.8 Enclosures Below the Required Elevation [Go to Page]
- 2.8.1 Required Flood Openings in Foundation Walls and Walls of Enclosures [Go to Page]
- 2.8.1.1 Flood Openings in Breakaway Walls
- 2.8.2 Design of Flood Openings [Go to Page]
- 2.8.2.1 Non-Engineered Flood Openings
- 2.8.2.2 Engineered Flood Openings
- 2.8.3 Installation of Flood Openings [Go to Page]
- 2.8.3.1 Exceptions to Installation of Flood Openings
- 2.8.4 Building Access/Door
- CHAPTER 3: HIGH RISK FLOOD HAZARD AREAS [Go to Page]
- 3.1 Scope
- 3.2 Alluvial Fan Areas [Go to Page]
- 3.2.1 Protective Works in Active Alluvial Fan Areas
- 3.3 Flash Flood Areas [Go to Page]
- 3.3.1 Protective Works in Flash Flood Areas
- 3.4 Mudslide Areas [Go to Page]
- 3.4.1 Protective Works in Mudslide Areas
- 3.5 Erosion-Prone Areas [Go to Page]
- 3.5.1 Protective Works in Erosion-Prone Areas
- 3.6 High Velocity Flow Areas [Go to Page]
- 3.6.1 Flood Protective Works in High Velocity Flow Areas
- 3.7 Areas Subject to Wave Action [Go to Page]
- 3.7.1 Coastal High Hazard Areas and Coastal A Zones
- 3.7.2 Other High Velocity and Moderate Wave Action Areas
- 3.8 Ice Jam and Debris Areas [Go to Page]
- 3.8.1 Flood Protective Works in Ice Jam and Debris Areas
- CHAPTER 4: COASTAL HIGH HAZARD AREAS AND COASTAL A ZONES [Go to Page]
- 4.1 Scope [Go to Page]
- 4.1.1 Identification of Coastal High Hazard Areas and Coastal A Zones
- 4.2 General
- 4.3 Siting
- 4.4 Elevation Requirements
- 4.5 Foundation Requirements [Go to Page]
- 4.5.1 General [Go to Page]
- 4.5.1.1 Shallow Foundations in Coastal High Hazard Areas
- 4.5.1.2 Shallow Foundations in Coastal A Zones
- 4.5.2 Special Geotechnical Considerations
- 4.5.3 Foundation Depth
- 4.5.4 Use of Fill
- 4.5.5 Deep Foundations [Go to Page]
- 4.5.5.1 Attachments to Piles
- 4.5.5.2 Piles Terminating in Pile Caps or Grade Beams That Are At or Below Grade
- 4.5.5.3 Piles Extending to Superstructure (Structure Framing)
- 4.5.5.4 Wood Piles
- 4.5.5.5 Steel H Piles
- 4.5.5.6 Concrete-Filled Steel Pipe Piles and Shells
- 4.5.5.7 Prestressed Concrete Piles and Precast Concrete Piles
- 4.5.5.8 Cast-in-Place Concrete Piles
- 4.5.5.9 Helical Piles and Anchors
- 4.5.6 Pile Design [Go to Page]
- 4.5.6.1 Pile Capacity
- 4.5.6.2 Capacity of the Supporting Soils
- 4.5.6.3 Minimum Penetration
- 4.5.6.4 Foundation Pile Spacing
- 4.5.6.5 Wood Pile Connections
- 4.5.6.6 Steel Pile Connections
- 4.5.6.7 Concrete Pile Connections
- 4.5.6.8 Pile Splicing
- 4.5.6.9 Mixed Types of Piling and Multiple Types of Installation Methodology
- 4.5.7 Columns [Go to Page]
- 4.5.7.1 Wood Posts
- 4.5.7.2 Reinforced Masonry Columns
- 4.5.7.3 Reinforced Concrete Columns
- 4.5.8 Foundation Elements That Support Columns or Walls
- 4.5.9 Pile Caps
- 4.5.10 Grade Beams
- 4.5.11 Bracing
- 4.5.12 Shear Walls
- 4.5.13 Stem Walls
- 4.6 Enclosed Areas Below the Required Elevation [Go to Page]
- 4.6.1 Breakaway Walls
- 4.6.2 Flood Openings in Breakaway Walls
- 4.7 Erosion Control Structures
- CHAPTER 5: MATERIALS [Go to Page]
- 5.1 General
- 5.2 Specific Materials Requirements for Flood Hazard Areas [Go to Page]
- 5.2.1 Metal Connectors and Fasteners
- 5.2.2 Structural Steel [Go to Page]
- 5.2.2.1 Corrosive Environments
- 5.2.2.2 Noncorrosive Environments
- 5.2.3 Concrete [Go to Page]
- 5.2.3.1 Concrete with Steel Reinforcement
- 5.2.3.2 Concrete with GFRP Reinforcement Concrete Reinforced
- 5.2.4 Masonry
- 5.2.5 Wood [Go to Page]
- 5.2.5.1 Preservative Treatment
- 5.2.5.2 Members and Connections
- 5.2.6 Finishes
- CHAPTER 6: DRY FLOODPROOFING AND WET FLOODPROOFING [Go to Page]
- 6.1 Scope
- 6.2 Dry Floodproofing [Go to Page]
- 6.2.1 Dry Floodproofing Limitations
- 6.2.2 Dry Floodproofing Requirements [Go to Page]
- 6.2.2.1 General Requirements
- 6.2.2.2 Flood Design Class 3 and Flood Design Class 4 Structures
- 6.2.2.3 Marking and Identification
- 6.2.2.4 Inspection, Maintenance, and Operations Plans [Go to Page]
- 6.2.2.4.1 Inspection Plan
- 6.2.2.4.2 Maintenance Plan
- 6.2.2.4.3 Flood Emergency Operations Plan
- 6.2.3 Limits on Human Intervention
- 6.3 Wet Floodproofing [Go to Page]
- 6.3.1 Wet Floodproofing Limitations on Use
- 6.3.2 Wet Floodproofing Requirements
- CHAPTER 7: ATTENDANT UTILITIES AND EQUIPMENT [Go to Page]
- 7.1 General
- 7.2 Electrical Service [Go to Page]
- 7.2.1 Service Conductors, Conduits and Cables
- 7.2.2 Exposed Service Conductors, Conduits and Cables
- 7.2.3 Electric Meters
- 7.2.4 Electrical Service and Distribution Equipment
- 7.2.5 Other Electric Components and Equipment
- 7.3 Plumbing Systems [Go to Page]
- 7.3.1 Buried Plumbing Systems
- 7.3.2 Exposed Plumbing Systems
- 7.3.3 Plumbing Systems Installed Below Minimum Elevations
- 7.3.4 Sanitary Systems
- 7.3.5 Flammable Gas and Fuel Supply Lines
- 7.4 Mechanical, Heating, Ventilation, and Air Conditioning Systems
- 7.5 Elevators [Go to Page]
- 7.5.1 Elevator Shafts
- CHAPTER 8: BUILDING ACCESS [Go to Page]
- 8.1 General
- CHAPTER 9: MISCELLANEOUS CONSTRUCTION [Go to Page]
- 9.1 General
- 9.2 Decks and Porches [Go to Page]
- 9.2.1 Attached Decks and Porches
- 9.2.2 Self-Supporting Decks and Porches
- 9.3 Concrete Slabs
- 9.4 Garages, Carports, and Accessory Storage Structures [Go to Page]
- 9.4.1 Attached Garages, Carports, and Accessory Storage Structures
- 9.4.2 Detached Garages, Carports, and Accessory Storage Structures
- 9.4.3 Multistory Parking Structures
- 9.5 Chimneys and Fireplaces
- 9.6 Pools [Go to Page]
- 9.6.1 Pools in Flood Hazard Areas Other than Coastal High Hazard Areas and Coastal A Zones
- 9.6.2 Pools in Coastal High Hazard Areas, Coastal A Zones, and Other High Risk Flood Hazard Areas
- 9.7 Tanks [Go to Page]
- 9.7.1 Aboveground Tanks
- 9.7.2 Underground Tanks
- 9.8 Tents and Membrane Structures
- REFERENCED CONSENSUS STANDARDS
- COMMENTARY TO STANDARD ASCE/SEI 24-24
- CHAPTER C1: GENERAL [Go to Page]
- C1.1 Scope
- C1.2 Definitions
- C1.3 Identification of Flood Hazard Areas
- C1.4 Identification of Flood-Prone Structures [Go to Page]
- C1.4.1 General
- C1.4.2 Consideration for Flood Protective Works
- C1.4.3 Assignment of Flood Design Class to Buildings and Structures
- C1.5 Basic Design and Construction Requirements [Go to Page]
- C1.5.1 General
- C1.5.2 Elevation Requirements [Go to Page]
- C1.5.2.1 FEMRI Determination for Flood Hazard Areas with Noncoastal Flood Sources
- C1.5.2.2 FEMRI Determination for Flood Hazard Areas with Coastal Flood Sources
- C1.5.2.3 Sea Level Change for Coastal Flood Sources
- C1.5.3 Foundation Requirements [Go to Page]
- C1.5.3.1 Geotechnical Considerations
- C1.5.3.2 Foundation Depth
- C1.5.3.3 Foundation Walls and Wall Footings
- C1.5.3.4 Columns or Piles
- C1.5.4 Use of Fill
- C1.5.5 Anchorage and Connections
- C1.6 Loads in Flood Hazard Areas [Go to Page]
- C1.6.1 General
- C1.6.2 Combination of Loads
- CHAPTER C2: BASIC REQUIREMENTS FOR FLOOD HAZARD AREAS THAT ARE NOT IDENTIFIED AS COASTAL HIGH HAZARD AREAS AND COASTAL A ZONES [Go to Page]
- C2.1 Scope
- C2.2 Development in Floodways
- C2.3 Elevation Requirements
- C2.4 Use of Fill [Go to Page]
- C2.4.1 Structural Fill
- C2.5 Slabs-On-Ground [Go to Page]
- C2.5.1 Use of Slabs-on-Ground
- C2.5.2 Elevating Slabs-on-Ground
- C2.6 Foundation Design
- C2.8 Enclosures Below the Required Elevation [Go to Page]
- C2.8.1 Required Flood Openings in Foundation Walls and Walls of Enclosures [Go to Page]
- C2.8.1.1 Flood Openings in Breakaway Walls
- C2.8.2 Design of Flood Openings [Go to Page]
- C2.8.2.1 Non-Engineered Flood Openings
- C2.8.2.2 Engineered Flood Openings
- C2.8.3 Installation of Flood Openings
- CHAPTER C3: HIGH RISK FLOOD HAZARD AREAS [Go to Page]
- C3.1 Scope
- C3.2 Alluvial Fan Areas [Go to Page]
- C3.2.1 Protective Works in Active Alluvial Fan Areas
- C3.3 Flash Flood Areas [Go to Page]
- C3.3.1 Protective Works in Flash Flood Areas
- C3.4 Mudslide Areas
- C3.5 Erosion-Prone Areas
- C3.6 High Velocity Flow Areas
- C3.7 Areas Subject to Wave Action
- C3.8 Ice Jam and Debris Areas
- CHAPTER C4: COASTAL HIGH HAZARD AREAS AND COASTAL A ZONES [Go to Page]
- C4.1 Scope [Go to Page]
- C4.1.1 Identification of Coastal High Hazard Areas and Coastal A Zones
- C4.2 General
- C4.3 Siting
- C4.4 Elevation Requirements
- C4.5 Foundation Requirements [Go to Page]
- C4.5.1 General [Go to Page]
- C4.5.1.1 Shallow Foundations in Coastal High Hazard Areas
- C4.5.1.2 Shallow Foundations in Coastal A Zones
- C4.5.3 Foundation Depth
- C4.5.4 Use of Fill
- C4.5.5 Deep Foundations [Go to Page]
- C4.5.5.4 Wood Piles
- C4.5.5.6 Concrete-Filled Steel Pipe Piles and Shells
- C4.5.5.7 Prestressed Concrete Piles and Precast Concrete Piles
- C4.5.5.8 Cast-in-Place Concrete Piles
- C4.5.5.9 Helical Piles and Anchors
- C4.5.6 Pile Design [Go to Page]
- C4.5.6.1 Pile Capacity
- C4.5.6.2 Capacity of the Supporting Soils
- C4.5.6.3 Minimum Penetration
- C4.5.6.4 Foundation Pile Splicing
- C4.5.7 Columns [Go to Page]
- C4.5.7.3 Reinforced Concrete Columns
- C4.5.8 Foundation Elements That Support Columns or Walls
- C4.5.10 Grade Beams
- C4.5.11 Bracing
- C4.5.12 Shear Walls
- C4.5.13 Stem Walls
- C4.6 Enclosed Areas Below the Required Elevation [Go to Page]
- C4.6.1 Breakaway Walls
- C4.6.2 Flood Openings in Breakaway Walls
- C4.7 Erosion Control Structures
- CHAPTER C5: MATERIALS [Go to Page]
- C5.1 GENERAL
- C5.2 Specific Materials Requirements for Flood Hazard Areas [Go to Page]
- C5.2.1 Metal Connectors and Fasteners
- C5.2.2 Structural Steel
- C5.2.3 Concrete [Go to Page]
- C5.2.3.1 Concrete with Steel Reinforcement
- C5.2.3.2 Concrete with GFRP Reinforcement Concrete Reinforced
- C5.2.4 Masonry
- C5.2.5 Wood
- CHAPTER C6: DRY FLOODPROOFING AND WET FLOODPROOFING [Go to Page]
- C6.1 Scope
- C6.2 Dry Floodproofing [Go to Page]
- C6.2.1 Dry Floodproofing Limitations
- C6.2.2 Dry Floodproofing Requirements [Go to Page]
- C6.2.2.4 Inspection, Maintenance, and Operations Plans [Go to Page]
- C6.2.2.4.3 Flood Emergency Operations Plans
- C6.2.3 Limits on Human Intervention
- C6.3 Wet Floodproofing
- CHAPTER C7: ATTENDANT UTILITIES AND EQUIPMENT [Go to Page]
- C7.1 General
- C7.2 Electrical Service [Go to Page]
- C7.2.5 Other Electric Components and Equipment
- C7.3 Plumbing Systems [Go to Page]
- C7.3.3 Plumbing Systems Installed Below Minimum Elevations
- C7.3.4 Sanitary Systems
- C7.4 Mechanical, Heating, Ventilation, and Air Conditioning Systems
- C7.5 Elevators [Go to Page]
- C7.5.1 Elevator Shafts
- CHAPTER C8: BUILDING ACCESS [Go to Page]
- C8.1 General
- CHAPTER C9: MISCELLANEOUS CONSTRUCTION [Go to Page]
- C9.2 Decks and Porches [Go to Page]
- C9.2.1 Attached Decks and Porches
- C9.2.2 Self-Supporting Decks and Porches
- C9.3 Concrete Slabs
- C9.4 Garages, Carports, and Accessory Storage Structures [Go to Page]
- C9.4.1 Attached Garages, Carports, and Accessory Storage Structures
- C9.4.3 Multistory Parking Structures
- C9.5 Chimneys and Fireplaces
- C9.6 Pools
- C9.7 Tanks
- C9.8 Tents and Membrane Structures
- REFERENCE DOCUMENTS
- Index
[Go to Page]