Station 3
Water Modeling & Economic Analyses

Extensive water modeling is being completed in order to evaluate baseline conditions with and without dams. The water modeling data was then incorporated in to complex economic models to evaluate the retrospective benefit cost ratio of the dams. In other words, before evaluating whether or not the dams should stay or go, it was wise to look at what benefits they have provided over the last 60 years.

Flood System Retrospective Benefit Cost Analyses Results

Preliminary Indicators:

  • Benefits are flood costs avoided by having dams since the 1960’s

  • Original purpose of protecting land uses is small because dam shadow acreages are low

  • Avoided streamside infra-structure damages and lower emergency services are higher

  • Recreation, particularly blue-ribbon trout fishery & Jersey Valley, are dominant benefits

  • Structure and crossings avoided damages are being calculated

A benefit cost ratio (BCR) at 1.0 or above describes the benefits out weighing the costs. While these analyses are preliminary, it describes both watersheds heavily reliant on recreational benefits. We strongly encourage participation in, or listening to the recording, of the live scoping meetings for the economist's interpretation and analysis of this complex data.

BCA - Copy.PNG
BCA.PNG

Utilizing those benefits, combined with the number of acres protected by the dams, the following baseline conditions with and without the dams apply:

Coon Creek

With Dams

  • 2,705 acres 100-year floodplain​

Without All 23 Dams​

  • 2,933 acres 100-year floodplain

  • Increases floodplain by 228 acres

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Without 5 Failed Dams, 18 Existing Remain

  • 2,796 acres 100-year floodplain

  • Increase floodplain by 91 acres

West Fork Kickapoo

With Dams

  • 2,149 acres 100-year floodplain​

Without All 23 Dams​

  • 2,419 acres 100-year floodplain

  • Increases floodplain by 270 acres

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Without 5 Failed Dams, 18 Existing Remain

  • 2,241acres 100-year floodplain

  • Increases floodplain by 92 acres

Summary

This analysis is looking at the previous 60 years, on the next page, we will review alternatives to address the five failed dams for the future. The decision made on the 5 failed dams will provide a road map for the Counties on how to address the remaining 18 dams that continue to age within the watersheds. Public input is a vital component to the decision making process and your opinion is valuable and appreciated.