HAZUS-MH Unit 4: Flood Model (Riverine): by w6WLescw

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									         HAZUS-MH
Unit 4: Flood Model (Riverine):
  Loss Estimation Analysis
         & Results
Hazard Analysis Review
                        Flood Hazard
                        HAZUS computes:
                        • Floodplain Boundary
                        • *Flood Depth Grid*


                                                               Floodplain Boundary


                                                                            Flood Water
                                                                              Elevation

Flood Water Elevation                               Normal Water Elevation
                                                       (stream channel)
 - Ground Elevation
                                                    Note: Normal water elevation*
                                                     in stream channels is typical
   = Flood Depth
                                                           ground elevation


                        Vertical Datum: Sea Level
                                                   Flood Hazard
                                                      Model




Initial Step:
Create Study Region


             1. Define Topography




                  2. Generate Stream Network



                              3. Define Scenario
                              (Study Case)
                          Flood Hazard Model




4. Run Hydrology
[Compute Discharge-Frequency
(Water Flow Rate)]




5. Delineate Floodplain
(Run Hydraulics)
               Flood Hazard Model
             Initial Step: Create/Open Study Region

             RIVERINE
              2. Generate                    4. Run
                 Stream                     Hydrology
                Network
1.Define                     3. Define                         5. Delineate
Topography                   Scenario                           Floodplain


                                         Segment          Enter
                                         Shoreline       100-yr
                                                        Elevation
             COASTAL
                            Final Step: Run Analysis & View Results           !
         HAZUS-MH
Unit 4: Flood Model (Riverine):
  Loss Estimation Analysis
         & Results
                           HAZUS-MH: Methodology

      Inventory                                                                    RESULTS
                                                                                     Direct Loss
   General Building Stock
     Essential Facilities
                                                     ANALYSIS       Economic
                                                                                      Business
High Potential Loss Facilities




                                 Damage Assessment
                                                                                     Interruption
       Transportation
           Utilities                                                                   Shelter
    Hazardous Materials                                               Social
 Demographics/Population
                                                                                     Casualties
    Agricultural Products
          Vehicles                                      Loss                          Essential
                                                                                      Facilities
                                                      Estimation                     Emergency
                                                                                     Response
                                                                   Functionality
                                                                                    Transportation

            Flood                                                                      Utilities
       Hurricane/Wind
        Earthquake
                                                                                        Water

        Hazard                                                       System            Power
                                                                   Performance
                                                                                    Transportation
    HAZUS-MH Methodology
     FLOOD HAZARD                                  INVENTORY
         Frequency
                                                      Buildings
         Discharge
                                                   Infrastructure
       Depth/Elevation
                                                     Population
          Velocity
                                                     Land Use
          Duration


                                 Analysis


   DIRECT DAMAGE                              INDUCED DAMAGE
   General Building Stock
     Essential Facilities                       Fire Following Flood
High Potential Loss Facilities              Hazardous Materials Release
  Transportation Facilities                      Debris Generation
         Lifelines
                                                                          Results

    DIRECT LOSSES                             INDIRECT LOSSES
Cost of Repairs/Replacement
                                                 Supply Shortages
        Income Loss
                                                 Sales Decline
        Crop Damage
                                                 Opportunity Costs
          Casualties
                                                 Economic Loss
Shelter and Recovery Needs
          Methodology:
General Building Stock Analysis

                Results are based on many factors that
                         go into the analysis

        Below are a few that are especially important and relate
        directly to the General Building Stock (GBS):

         Flood Specific Occupancy Mapping
         Damage Functions
                             General Building Stock:
  „Flood Specific‟ Inventory Distribution Schemes




     Flood Specific
   Occupancy Mapping
         Table
Foundation Types and associated
        1st Floor Heights
        distribution by
   Specific Occupancy Type


                                  • 1st Floor Heights are in “feet above grade”
                                  • Foundation Types are in %‟s for each Specific Occupancy Type
                                    General Building Stock:
     „Flood Specific‟ Inventory Distribution Schemes

    Flood Specific
  Occupancy Mapping
        Table
  Foundation Types and
                                               Users may apply
associated 1st Floor Heights
                                             distribution schemes
        distribution by                            to some/all
  Specific Occupancy Type                       Census Blocks




 HAZUS-Supplied
 Distribution Schemes
                                               Users may create NEW Distribution Schemes
                                           and modify Foundation Types and/or 1st Floor Heights

Note:
Entry Date = Year Census Block entered NFIP
It is then compared w/ Year Built to determine whether Pre or Post FIRM Tables should be applied in assessing damage
General Building Stock:
Damage Functions
                    Depth-Damage Functions
                 Flood Depth – Bldg 1st Floor Height = Flood Damage Depth


                                               Depth-Damage curves are applied
                                                at different flood damage depths
                                                 •   Starting from 1st floor height of Building
                                                     (Flood Damage Depth of “0” = 1st floor height)




                                                        Flood
                                                                                Used in
                                                       Damage                   Analysis!
 Flood                                                  Depth
 Depth                “Foundation Type”                          1st Floor Height
                       Basement Y or N?                              taken from
                                                                  Flood Specific
                                                                Occupancy Mapping
                                                                       Table
Note: For Equipment, height above 1st floor
               Depth-Damage Functions
 Damage to buildings and other inventory is estimated using
                  depth-damage curves
               100%
    Damage %


               50%
               0%




                      0 ft        5 ft           10 ft           15 ft

                                Flood Damage Depth
Note: “Damage %” applies to all Inventory Base Tables: Sq Ft, Bldg Count, Dollar Exposure
                    (Replacement Value and Depreciated value)
                Depth-Damage Functions
                   “Area-weighted assessment”
          for Aggregated data (i.e. General Building Stock)


Analysis model performs an area-weighted assessment of the flood damage



     0‟
0‟
           0‟    0‟   0‟   1‟
                                       Flood Depth Grid
                                2‟    4‟   6‟    6‟    6‟   7‟    8‟




                      Profile: Census Block
                     Depth-Damage Functions
                          “Area-weighted assessment”
                  for aggregated data (General Building Stock)



• Number of grid cells at each flood depth value
  divided by the total number of grid cells in the                              1
  Census Block
                                                                            1   1
• Result is used to “weight” the damage at that
  flood depth for each specific occupancy/sub-class
                                                            1       1   1   1   2
 Note: Flood Depths are converted to Flood Damage
                                                            1   1   1   2   2   2
 Depths based on Foundation Type/1st Floor Height
 Percentages for each specific occupancy type/sub-class     2   2   2   3   3   3
 Note: Damage % is applied to all Inventory Base Tables
 (Sq. Ft., Bldg Count, Dollar Exposure, Depreciated Exp.)
                                                            3   3   3   3   4   4
                                                            4   4   4   5   5   5
                                                                Census Block
                      Depth-Damage Functions
                       “Location-specific assessment”
                for Site Specific data (i.e. Essential Facilities)

IMPORTANT: The hospital Essential Facility (below) is not in the flood inundation area, however this
Occupancy Type (COM6) in the GBS analysis might reveal damages/losses based on area-weighted
assessment performed on aggregated data


       Long: -97.75
       Lat: 30.33
                                                     Long: -97.74
                                                     Lat: 30.35
                                                                    Flood Depth Grid
        Hospital                      1‟      2‟      4‟      6‟     6‟       6‟     7‟      8‟

                                                     Fire Station




                              Profile: Census Block
Depth-Damage Functions

                    Sources
   HAZUS buildings and user-defined facilities use
    adapted curves from several sources including:

     • USACE District Curves - Chicago, Galveston, New
       Orleans, New York, Philadelphia, St. Paul, and
       Wilmington
     • USACE IWR - “national standard” residential
       curve (2000). Other curves under development.
     • FIA - CWDD, V Zone
     • Other Coastal - Tampa Bay Regional Planning
       Council, Delaware
 Depth-Damage Functions:                                     GBS




8 sub-classes of RES1




                            Users can create NEW Curves
                           and modify Depth-Damage values

 Different Depth-Damage Curves to choose from based on
  Specific Occupancy Type and sub-class
 Default Curve depends on Specific Occupancy Type (ex. RES1 = FIA)
Depth-Damage Functions:                     GBS




                       Values =
                    % Damaged
                     by Flood
                  „Damage Depth‟
                Notice negative values for Basement foundation types.
                All negative values grouped as one, for analysis
                              Methodology:
                          Essential Facilities Analysis

                                                 Essential Facility Damage Curves are very similar
                                                 to GBS

                                                 …EF‟s will also provide results in “functionality”
                                                 (% functional; # of days non-functional until 100%)
                                                 based on “flood depth thresholds” beyond which
                                                 are considered non-functional.




Flood Depths for Site Specific inventory
are determined by DEM (grid cell) value
        at the Lat/Long location




             Flood depth Threshold
  If exceeded, facility becomes non-functional
Depth-Damage Functions:
     Essential Facilities


            EF classifications




  Depth-Damage Curves
               Flood Hazard Model
             Initial Step: Create/Open Study Region

             RIVERINE
              2. Generate                   4. Run
                 Stream                    Hydrology
                Network
1.Define                    3. Define                          5. Compute
Topography                  Scenario                              Hazard


                                        Segment          Enter
                                        Shoreline       100-yr
                                                       Elevation
             COASTAL
                            Final Step: Run Analysis & View Results
Flood Hazard Model

    Analysis Menu
                 Final Step:
         Run Analysis & View Results

 Input = Analysis options
   •   Inventory-based

 Output = View results
   •   Results tables
         • Summary reports
   •   GIS: maps
   •   GIS: attribute tables

 Re-run analysis due to:
   •   new Scenario area
   •   modified Inventory or related
       parameters and schemes
   •   added local data
   •   modified Analysis functions and
       parameters,
   •   “What If” scenarios and mitigation
       actions
Results Menu




                               multiple Return Periods
                             to choose from if you ran
                           Suite of Return Periods during
                          Compute Hazard (Run Hydraulics)



   special Crystal Reports format
Run Analysis & View Results
                     by Results Table




                                                                see next slide




 GBS: Direct Economic Loss (Full Replacement Value)
Total Losses (All Occupancies/All Bldg Types/Pre & Post FIRM)
Run Analysis & View Results
                           by Map




 GBS: Direct Economic Loss (Full Replacement Value)
Total Losses (All Occupancies/All Bldg Types/Pre & Post FIRM)
   Run Analysis & View Results
                           by Attribute Table




       $91+ million




REMEMBER! units are often in thousands of dollars (derived from HAZUS Tables)
Run Analysis & View Results
                 by Summary Report




   GBS: Direct Economic Loss (Full Replacement Value)
  Total Losses (All Occupancies/All Bldg Types/Pre & Post FIRM)
Exercise 4: Flood Model
Loss Estimation Analysis

								
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