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Hazus: Flood Event Report

HAZUS - Hays County Flood Event Report

Disclaimer: This version of Hazus utilizes 2010 Census Data.
Totals only reflect data for those census tracts/blocks included in the user's study region.

The estimates of social and economic impacts contained in this report were produced using Hazus loss estimation methodology software which is based on current scientific and engineering knowledge. There are uncertainties inherent in any loss estimation technique. Therefore, there may be significant differences between the modeled results contained in this report and the actual social and economic losses following a specific Flood. These results can be improved by using enhanced inventory data and flood hazard information.

Section Quick Links
General Description fo the Region Building Inventory Building Damage
Induced Flood Damage Social Impact Economic Loss

General Description of the Region

Hazus is a regional multi-hazard loss estimation model that was developed by the Federal Emergency Management Agency (FEMA) and the National Institute of Building Sciences (NIBS).  The primary purpose of Hazus is to provide a methodology and software application to develop multi-hazard losses at a regional scale.  These loss estimates would be used primarily by local, state and regional officials to plan and stimulate efforts to reduce risks from multi-hazards and to prepare for emergency response and recovery.

The flood loss estimates provided in this report were based on a 100-year probabilistic flood scenario, as generated by the HAZUS hydrology and hydraulic simplified methods.

The geographical size of the region is 680 square miles and contains 3,165 census blocks. The region contains over 55 thousand households and has a total population of 157,107 people (2010 Census Bureau data). The distribution of population by State and County for the study region is provided in Appendix B. 

There are an estimated 52,739 buildings in the region with a total building replacement value (excluding contents) of 16,438 million dollars (2010 dollars). Approximately 93.48% of the buildings (and 87.63% of the building value) are associated with residential housing.

Building Inventory

General Building Stock

Hazus estimates that there are 52,739 buildings in the region which have an aggregate total replacement value of $16,438 million (2010 dollars). Table 1 and Table 2 present the relative distribution of  the value with respect to the general occupancies by Study Region and Scenario respectively.  Appendix B provides a general distribution of the building value by State and County.

Table 1: Building Exposure by Occupancy Type for the Study Region
Occupancy Exposure ($1,000) Percent of Total
Residential 14,403,951 87.6 %
Commercial 1,302,139 7.9 %
Industrial 329,067 2%
Agricultural 41,944 0.3%
Religion 136,417 0.8%
Government 65,226 0.4%
Education 159,049 1.0%
Total 16,437,703 100%
Table 2: Building Exposure by Occupancy Type for the Scenario
Occupancy Exposure ($1,000) Percent of Total
Residential 5,701,299 86.2%
Commerical 524,482 7.9%
Industrial 186,638 2.8%
Agricultural 28,555 0.4%
Religion 55,675 0.8%
Government 27,012 0.4%
Education 90,321 1.4%
Total 6,613,983 100%

 

Building Damage

General Building Stock Damage

Hazus estimates that about 557 buildings will be at least moderately damaged.  This is over 50% of the total number of buildings in the scenario.  There are an estimated 199 buildings that will be completely destroyed. The definition of  the ‘damage states’ is provided in Volume 1: Chapter 5 of the Hazus Flood Technical Manual.  Table 3 below summarizes the expected damage by general occupancy for the buildings in the region.  Table 4 summarizes the expected damage by general building type.

Table 3: Expected Building Damage by Occupancy
  1-10 11-20 21-30 31-40 41-50 Substantially
Occ. Count (%) Count (%) Count (%) Count (%) Count (%) Count (%)
Ag. 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00 1 100
Cml. 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00 3 100
Edu. 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00
Gov. 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00
Ind. 1 50.00 0 0.00 0 0.00 0 0.00 0 0.00 1 50.00
Rel 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00
Resid. 143 20.58 193 27.77 74 10.65 49 7.05 42 6.04 194 27.91
Total 144 193 74 49 42 199
Occ. = Occupancy, Ag. = Agriculture, Cml. = Commercial, Edu. = Education, Gov. = Government, Ind. = Industrial, Rel = Religion, Resid. = Residential
Table 4: Expected Building Damage by Building Type
  1-10 11-20 21-30 31-40 41-50 Substaintially
Building Type Count (%) Count (%) Count (%) Count (%) Count (%) Count (%)
Concrete 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00
Manuf. Housing 9 15.79 7 12.28 4 7.02 0 0.00 4 7.02 33 57.89
Masonry 6 21.43 9 32.14 2 7.14 1 3.57 1 3.57 9 32.14
Steel 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00 1 100.00
Wood 127 20.79 177 28.97 68 11.13 48 7.86 37 6.06 154 25.20

 

Essential Facility Damage

Before the flood analyzed in this scenario, the region had 136 hospital beds available for use.  On the day of the scenario flood event, the model estimates that 136 hospital beds are available in the region.

Table 5: Expected Damage to Essential Facilities
      Number of Facilities  
Classification Total At least Moderate At Least Substanial Loss of Use
Fire Stations 14 0 0 0
Hospitals 2 0 0 0
Police Stations 6 0 0 0
Schools 53 4 0 4

If this report displays all zeros or is blank, two possibilities can explain this.

  1. None of your facilities were flooded. This can be checked by mapping the inventory data on the depth grid.
  2. The analysis was not run.  This can be tested by checking the run box on the Analysis Menu and seeing if a message box asks you to replace the existing results.

Induced Flood Damage

Debris Generation

Hazus estimates the amount of debris that will be generated by the flood.  The model breaks debris into three general categories: 1) Finishes (dry wall, insulation, etc.), 2) Structural (wood, brick, etc.) and 3) Foundations (concrete slab, concrete block, rebar, etc.). This distinction is made because of the different types of material handling equipment required to handle the debris.

The model estimates that a total of 28,794 tons of debris will be generated.  Of the total amount, Finishes comprises 30% of the total, Structure comprises 30% of the total.  If the debris tonnage is converted into an estimated number of truckloads, it will require 1,152 truckloads (@25 tons/truck) to remove the debris generated by the flood.

Social Impact

Shelter Requirements

Hazus estimates the number of households that are expected to be displaced from their homes due to the flood and the associated potential evacuation.  Hazus also estimates those displaced people that will require accommodations in temporary public shelters. The model estimates 1,576 households will be displaced due to the flood. Displacement includes households evacuated from within or very near to the inundated area. Of these, 3,022  people (out of a total population of 157,107) will seek temporary shelter in public shelters.

Economic Loss

The total economic loss estimated for the flood is 275.07 million dollars, which represents 4.16 % of the total replacement value of the scenario buildings.

Building-Related Losses

The building losses are broken into two categories: direct building losses and business interruption losses. The direct building losses are the estimated costs to repair or replace the damage caused to the building and its contents. The business interruption losses are the losses associated with inability to operate a business because of the damage sustained during the flood. Business interruption losses also include the temporary living expenses for those people displaced from their homes because of the flood.

The total building-related losses were 273.98 million dollars. 0% of the estimated losses were related to the business interruption of the region. The residential occupancies made up 77.83% of the total loss.  Table 6 below provides a summary of the losses associated with the building damage.

Table 6: Building-Related Economic Loss Estimates
(Millions of dollars)
Category Area Residential Commerical Industrial Others Total
Building Loss            
  Building 138.14 9.50 3.81 4.10 155.55
  Content 75.69 23.17 7.30 10.29 116.45
  Inventory 0.00 0.56 1.19 0.23 1.98
  Subtotal 213.84 33.22 12.30 14.63 273.98
Business Interruption            
  Income 0.01 0.10 0.00 0.02 0.12
  Relocation 0.19 0.01 0.00 0.01 0.21
  Rental Income 0.04 0.01 0.00 0.00 0.05
  Wage 0.02 0.11 0.00 0.58 0.71
  Subtotal 0.25 0.23 0.00 0.61 1.09
All Total 214.09 33.45 12.30 15.23 275.07