HAZUS PowerPoint Presentation

SLIDE 1

Mecklenburg County
HAZUS Project

(Mecklenburg County, North Carolina seal)

ASFPM 25th Annual Conference

Charlotte-Mecklenburg Stormwater Services

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SLIDE 2

Guidance Document

- Business Plan
- Initiated December 1994 - adopted December 1997
- Objectives:
* Prevent or reduce loss of life and damage caused by floods
* Preserve the natural and beneficial functions of floodplains

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SLIDE 3

I. New Development

Floodplain Regulations
- Determine the extent maps are out of date
- Benefits to mapping future landuse conditions
- What are the real impacts of filling in the floodplain

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SLIDE 4

Compared to Old FEMA maps:

- FEMA Floodplain (1999 landuse)
* Average change: +1.9 feet to -1.9 feet
* Range: +8.7 feet to -6.1 feet

- FLUM Floodplain (Future landuse)
* Average change: +4.3 to -0.2
* Range: +11.0 to -4.6

- Mallard and McAlpine Data

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SLIDE 5

McAlpine Creek Flood Depth
Original 100-Year Floodplain

(image displays parcels with varied Flood Depths in 0-20 feet)

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SLIDE 6

McAlpine Creek Flood Depth
New 100-Year Floodplain

(image displays parcels with varied Flood Depths in 0-20 feet)

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SLIDE 7

Intuitive.....

- Future floodplain mapping is effective mitigation
* But how effective?

- Acquisition is effective mitigation
* But how effective?

- Future mapping/acquisition are great "balanced" activities
* How much of the problem are we avoiding/solving

- We have no flood loss baseline!!

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SLIDE 8

Estimated Flood Loss for Residential Occupancies in the McAlpine Watershed
(bar chart displays Applied Floodplain Study and Assessor Inventory vs. Estimated
Flood Loss ($ in Millions) for Total Structure Damage and Total Contents Damage)

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SLIDE 9

Estimated Flood Loss for Non-residential Occupancies in the McAlpine Watershed
(bar chart displays Applied Floodplain Study and Assessor Inventory vs. Estimated
Flood Loss ($ in Millions) for Total Structure Damage and Total Contents Damage)

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SLIDE 10

McAlpine Creek Structure Damage
Original 100-Year Floodplain, Current Building Inventory

(image displays parcels with varied Estimated Current Loss ($1000) from 0 - 1035)

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SLIDE 11

McAlpine Creek Structure Damage
New 100-Year Floodplain, Current Building Inventory

(image displays parcels with varied Estimated Current Loss ($1000) from 0 - 1035)

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SLIDE 12

Strategy VI. Mitigation Planning

- Developed per watershed
- Identify flood-prone structures
- Develop alternatives
- Compare alternative to other community values

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SLIDE 13

Mecklenburg County
Flood Hazard Mitigation
Briar Creek Mitigation Basin 009

(map image displays Briar Creek Between Seaboard Coastline and Commonwealth
Avenue, with indicator of Replacement of existing Seaboard Coastline Railroad
Culvert with a larger span bridge. The approximate cost is $1,200,000 and 
indicators of Floodwall 5 feet high that will cost approximately $360,000.)

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SLIDE 14

Mecklenburg County
Flood Hazard Mitigation
Upper Little Sugar Creek Mitigation Basin 005

(map image displays Upper Little Sugar Creek Between Woodlawn Road and the 
Confluence with Diary Branch, with indicators Acquisition of 33 structures at a
cost of approximately $4,700,000; Elevation of 80 strucures at at cost of 
approximately $3,500,000; Floodway; and 100-Year Floodplain)

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SLIDE 15

HAZUS, Mapping and Mitigation Plans

- Measure success (in dollars) and take credit for mitigation from future mapping
- Develop a flood loss baseline to measure from
- Use occupancy types and locations to focus implementation of mitigation 
techniques
- Data justifies actions

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