Residential, Commercial-Industrial and Community Based property losses will be estimated for each water level scenario on a lakewide basis for low water, erosion and flooding damages. In 2000 preliminary results for erosion and low water damages were calculated for one of the the prototype counties (Allegan County, Michigan) and are summarized below.
Low Water Damage Assessments
For low water, damages to residential, commercial, industrial, institutional, and community-based land uses under low water conditions (which may occur under any water level scenario) will be calculated. Impacts of low water scenarios could include, but are not limited to, the following:
- loss of structures due to drop in static water level
- increased maintenance costs of private boats (e.g., prop damage)
- loss of use of private and public boat slips and marinas
- impacts on water intakes and wastewater discharge outfalls
Low water damages will be summarized by land use category. Damages will be calculated at the parcel level, if available, and summarized by township and county. Low water damages will be summarized to produce one damage value for each county over the 50-year planning horizon.
Details on the low water damage methodologies utilized and results for Allegan County will be available in the full consulting report on this topic (Snell Environmental Group et al., 2000) which will be available on the Document Clearinghouse in the near future. A brief summary of results for for Allegan County will be presented here when available. Results for the other prototype counties will be developed in 2001.
Erosion Damage Assessments
In 2000, work was initiated on the determination of potential erosion impacts and damage amounts. The goal of this task was to calculate potential erosion damages for residential, commercial, industrial, institutional and community based land uses from shoreline erosion on Lake Michigan. A series of methodologies was used to generate an assessment of economic damages for shoreline erosion on the Lake Michigan coastline. Damages were calculated under three (3) hydrologic scenarios. The damages were calculated as a total cost over the 50-year planning horizon. The damages for each land use were calculated by the type of action causing the damage, in this case, erosion. The specific study areas for erosion damages in this project phase included shoreline parcels in Allegan and Ottawa counties in Michigan and Ozaukee, Sheboygan and Manitowoc counties in Wisconsin.
Details on the erosion damage methodologies utilized and results for Allegan County will be available in the full consulting report on this topic (Snell Environmental Group et al., 2000) which will be available on the Document Clearinghouse in the near future. A brief summary of results for for Allegan County will be presented here when available. Results for the other prototype counties will be developed in 2001.
Flood Damage Assessments
For damages due to flooding, the damages to all land uses will be calculated under flooding conditions that may occur under any of the three water level scenarios. Damages will be calculated for a minimum of two water levels above the riverbank for inland harbor areas (e.g., 100-year and 500-year water levels).
Impacts of flooding could include, but are not limited to, the following:
- loss of structures, if any, caused by flood waters
- loss of commercial income during floods
- costs to communities and private citizens for cleanup and restoration of property
Officials at the local community level will be contacted to obtain information on historical impacts of flooding. Flooding damages will be calculated by event and summarized over the 50-year planning horizon. Damages will be calculated at the parcel level, if available, and summarized by township and county. Damages will also be summarized by land use category. LIDAR surveys of three river mouths in the Michigan prototype counties was conducted in 2000. This provides the basis for calculation of flooding damages. Potential damages for three water levels scenarios (base case, extreme high, and extreme low scenarios) will be calculated for the five prototype scenarios in 2001.
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