FINAL REPORT - International Joint Commission

C. Summary Tables of Plan Results
The following set of summary tables provides results from all regulation plans described in the main
report. The tables cover results for all candidate plans, interest-specific and reference plans under the
historical time series. They include the economic results for the candidate plans for the 50,000-year
stochastic sequence. Environmental results are not available for the full stochastic as the Integrated
Ecological Response Model component of the Shared Vision Model could not be adapted to run the full
50,000-year sequence. Economic and environmental results for the candidate plans under four separate
101-year extreme centuries selected from the 50,000-year stochastic series (S1 through S4) and economic
results for the candidate plans under four separate 101-year climate change time series based on different
supply series (C1-C4) are also included.
ANNEX 3
The programmed Plan 1958-DD was run through all of the time-series sequences to provide the baseline
against which all plans would be compared. To allow this comparison, all economic damages related to
1958-DD were set to equal zero; in this way, any increase in damages was considered a negative benefit
and any decrease in damages was considered a positive benefit. All economic results, with the exception
of Table C-1, are shown relative to Plan 1958-DD.
Plan 1958-DD – Absolute Damages
While all damages were set to zero for comparison purposes, this does not mean there are zero damages
under Plan 1958-DD. For example, shoreline erosion damages are an ongoing phenomenon and occur
with every regulation plan. The table below shows the gross values of the economic performance
indicators measured when Plan 1958-DD was evaluated for the historical time series and the stochastic
time series. The purpose of the table is to show how and why the values differ between historical and
stochastic evaluations; the gross numbers shown may or may not have meaning. For example, while the
difference between the hydropower performance indicator for any two plans does represent the societal
value of the marginal difference in energy production, the gross number for Plan 1958-DD hydropower
does not represent anything real by itself. The gross performance indicators for coastal damages, on the
other hand, do represent our best estimates of the actual costs stakeholders will bear in addressing those
impacts under Plan 1958-DD.
Options for Managing Lake Ontario and St. Lawrence River Water Levels and Flows
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