The results available for a given alternative can be viewed by the type of damage measure: expected annual damage or average annual equivalent damage. The expected annual damage reports summarize information available from the scenario damage reports. Average annual equivalent damage is the main result of an alternative. All compute algorithms in HEC-FDA Version 2.0 are the same as those found in HEC-FDA Version 1.4.3, except those identified in the HEC-FDA Version 2.0 Release Notes.
Average Annual Equivalent Damage
Average annual equivalent (AAEQ) damage (previously known as equivalent annual damage) reflects the amortization of damage over the period of analysis for the purpose of comparison with average annual equivalent cost on an apples-to-apples basis. Three reports are available on average annual equivalent damage: damage with uncertainty, damage by impact area, and damage by damage category.
Damage with Uncertainty
HEC-FDA processes the distributions of expected annual damage for each scenario connected to an alternative to calculate the distribution of average annual equivalent damage. An image of the report on AAEQ damage with uncertainty is included below. On the top left-hand side, the mean of the distribution is displayed. Under the mean, the first, second, and third quartiles of AAEQ damage are reported. The distribution of AAEQ damage realizations is displayed on the right-hand side of the report. The discount rate and period of analysis by which the amortization was carried out are displayed underneath the histogram.
Damage by Impact Area
The damage by impact area report displays the mean AAEQ damage for each impact area summed across all damage categories. In the example below, there are two impact areas. The discount rate and period of analysis are displayed under the table.
Damage by Damage Category
The damage by damage category report displays the mean AAEQ damage for each damage category summed across all impact areas. In the example below, there are three damage categories. The discount rate and period of analysis are displayed under the table.
