Plan Formulation Workshop

Objective

Using the HEC-FDA Version 2.0 software for Workshop (in-person 225 min) – In this hands-on workshop participants, use the Muncie, Indiana example study data to create an HEC-FDA study from scratch to formulate and evaluate flood risk management alternatives. The workshop emphasizes formulation and evaluation of several flood risk management plans including levee only, detention only, nonstructural measures only, joint detention and levee, levee and nonstructural, and detention and nonstructural plans (or scenarios).

Downloadable Workshop Materials

Software Version

HEC-FDA Version 2.0.1 beta will be used during this course.  Download the portable version of the software by following the instructions provided, here: FY25 Download HEC-FDA Version 2.0.1 Beta. Detailed instructions are included on this page.

Workshop Datafiles

Download Zipped Workshop Datafiles:  

Introduction

In this final workshop, you'll put together everything you learned in previous workshops to build a model containing many alternatives. Less information will be provided for you so that you can test your knowledge of the software. A series of questions will follow and the solution project will be provided so you can check your answers.

Note, this workshop is separated into two parts.

Part 1

Part 1 – Overview Table

Part 1 requires you to create an HEC-FDA Version 2.0 project from scratch with the data defined in Table 1.

Table 1 - Part 1 Study Data
Study DataNameDescription
TerrainMuncie TerrainThe Muncie terrain is the same file used the the hydraulic engineers in modeling the existing condition hydraulics.
Impact Areas SetMuncie Impact AreasImpact Area Set containing two impact areas (Left-Bank and Right-Bank)
HydraulicsExisting ConditionsExisting Condition Steady HDF. The hydraulic modeling was developed in steady-state condition. The native output files have been provided for use within HEC-FDA.
Frequency FunctionsExisting Condition LP3sFlow-Frequency LPIII distribution for a period of record (Record Length) of 48 years
Regulated-Unregulated Transform Functions*With-Project TransformThis regulated-unregulated transform function represents the attenuation of flashy flows provided by the modeled detention basin in the with-project condition that would be located just upstream of the impact area set.
Stage Transform Functions > Stage-Discharge Functions
  • Existing Condition Relationship
  • With-Project Condition
  • This stage-discharge function represents the relationship between stage and discharge for the without-project condition.
  • The stage-discharge function below represents the with-project condition. Observe that some stages are higher for a given discharge.
Lateral StructuresLevee948ftThis system response function is tied to a modeled levee in the with-project condition that is proposed for the Left-Bank impact area with a top elevation of 948 feet.

Economics > Occupancy Types

NSI_OccTypes

The Muncie occupancy types are the typical occupancy types referenced in the National Structure Inventory

Economics > Structure Inventories

  • Existing_BaseSI
  • Future_WithoutSI
  • With-projectSI
  • With-project_FutureSI
  • base inventory for the Existing Conditions (without-project inventory)
  • future without-project inventory for the without-project future conditions (In the future year, the number of commercial structures has been doubled to reflect an economic forecast suggesting significant growth in the concentration of commercial activity in Muncie, In between the base and most likely future years.)
  • base year with-project inventory
  • future year with-project inventory (In the future year, the number of commercial structures has been doubled to reflect an economic forecast suggesting significant growth in the concentration of commercial activity in Muncie, In between the base and most likely future years.)

Economics > Stage-Damage Functions

  • Existing Stage-Damage
  • Existing_Future
  • Nonstructural
  • Nonstructural_Future
  • Computed for HEC-FDA Version 2.0 Workshops Existing Condition Stage-Damage Function (without-project)
  • Computed future without-project inventory for the without-project future conditions (number of commercial structures has been doubled to reflect an economic forecasting)
  • Computed for nonstructural inventory for the base year with-project conditions
  • Computed future with-project inventory for the with-project conditions most likely future year

*NEW function you have not entered in previous workshops. This is the first workshop with a Detention plan and the Regulated-Unregulated Transform Function represents the attenuation of flashy flows provided by the modeled detention basin. So, you'll need this new function for the Detention Plan.

Part 1 – Instructions

  1. Open the HEC-FDA Version 2.0 software

  2. Create a new study and set study properties. (Don't forget to update the discount rate).

  3. Import the Muncie Terrain file ("Terrain.hdf").

  4. Import the Muncie Impact Areas file ("ImpactAreaFinal.shp").

  5. Import the Steady State Muncie HEC-RAS Native Output hydraulics data ("Muncie.p10.hdf").

    • From the Study Tree under Hydraulics right-click on Study HDF, and click Import Hydraulics. The Import Hydraulics dialog opens as a tab.

      • Enter a name and a description.
      • Select the ellipse button to open the Select File browser window and navigate to the folder containing the existing conditions hydraulic data (e.g., C:\Workshops\FDA\data\MuncieFinal\QSGStudyData\Hydraulics\Native Output), select the file "Muncie.p10.hdf" and click Open.

      • Manually, enter the appropriate return interval value based on Table 3.

        Table 3
        NameReturn Interval
        22.00
        55.00
        1010.00
        2525.00
        5050.00
        100100.00
        200200.00
        500500.00
      • Check that your entered values are correct and click Save and Close. 

  6. Create Flow-Frequency Function.

    • From the Study Tree, right-click on Frequency Functions and select Create New Frequency Function. The Create Frequency Function opens as a tab.
      • Enter a name and a description for the frequency function. 

      • Select the Analytical radio button and enter the LPIII Parameters listed below. 

        MeanStandard DeviationSkewPeriod of Record
        3.7070.24-0.475 48
      • Click Save and Close.

  7. Enter the Regulated-Unregulated Transform Function (data displayed in Table 4). This is a NEW function you have not entered in previous workshops. This is the first workshop with a Detention plan and the Regulated-Unregulated Transform Function represents the attenuation of flashy flows provided by the modeled detention basin. So, you'll need this new function for the Detention Plan.

    • From the Study Tree, right-click on Regulated-Unregulated Transform Functions and select Create New Regulated-Unregulated Relationship. The Create New Regulated-Unregulated Relationship opens as a tab.

      • Enter a name for the relationship in the Name box (e.g., With-Project Transform), and enter a description for the relationship (e.g., This regulated-unregulated transform function represents the attenuation of flashy flows provided by the modeled detention basin in the with-project condition that would be located just upstream of the impact area set.).

      • Select the Triangular Distribution Type and copy the data displayed in Table 4 into the table in HEC-FDA.

        Inflow (cfs)Min Outflow (cfs)Most Likely Outflow (cfs)Max Outflow (cfs)
        1000100010001000
        2000200020002000
        4000400040004000
        7000700070007000
        100007100800010000
        1200080001000012000
        1300090001100013000
        15000115001300015000
        17000170001700017000
        20000200002000020000
        Table 4 - With-project Transform (Regulated-Unregulated Transform Function
      • Click Save.

  8. Enter the Without-project Condition Stage-Discharge Function (data in Table 5).

    • From the Study Tree, right-click on Stage-Discharge Functions and select Create New Stage-Discharge Relationship. The Create New Stage-Discharge Relationship opens as a tab. 

      • Enter a name and a description for the relationship. 

      • Use the information in Table 5 to create the new stage-discharge relationships for the without-project condition for the triangular distribution.

        Table 5 - Without-project Stage Discharge Function

        Loading

      • Click Save.

  9. Enter the With-project Condition Stage-Discharge Function (data in Table 6).

    • From the Study Tree, right-click on Stage-Discharge Functions and select Create New Stage-Discharge Relationship. The Create New Stage-Discharge Relationship opens as a tab.

      • Enter a name and a description and use the information in Table 6 to create the triangular distribution for the with-project condition.

        Table 6 - With-project Stage Discharge Function

        Loading


      • Click Save.

  10. Create Lateral Structure for the Levee Plan. 

    • From the Study Tree, right-click on Lateral Structures and select, Create New Lateral Structure. The Create New Lateral Structure dialog opens as a tab. Use the Create New Lateral Structure dialog to add the Levee Plan:
      • Enter a name and a description for the levee plan (e.g., Name: Levee Plan; Description: With-project scenario for proposed levee for the left-bank with a top elevation of 948 feet).
      • Enter the Top of Levee Elevation: 948
      • Select the System Response Curve: Default
      • Click Save to save the Levee Plan and add it to your project's Study Tree.

  11. Import Occupancy Types ("MuncieOccTypes20241125.txt").

  12. Import the Without-project Base Structure Inventory ("BaseMuncieStructsFinal.shp").

    • From the Study Tree, under Economics, right-click on Structure Inventories and select Import From Shapefile. The Import Structure Inventory opens as a tab.
      • Enter a name and a descripton. Click the Browser ellipse button and navigate to the folder containing the structure inventory file (e.g., C:\Workshops\FDA\data\MuncieFinal\QSGStudyData\StructureInventories\base-year_without-project), select the file "BaseMuncieStructsFinal.shp" and click Open.
      • Select the following in the Required Attributes: Ground Elevation and Foundation Height radio button and the Ground Elevation Source by selecting the From Structures File radio button.

      • Make the following selections for the Import Attributes:

        Name

        Import Attributes Selection

        Structure IDTARGET_FID
        Occupancy Typeocctype
        Foundation Heightfound_ht
        Ground Elevation Valueground_elv
        Structure Valueval_struct
        Content Valueval_cont
        Vehicle Valueval_vehic
      • Click Next to access the next window in the import wizard and check the Default Occupancy Type Assignments. When finished reviewing the default assignments, click Finish.

  13. Import the Future Without-Project Structure Inventory ("BaseMuncieStructsFinalFuture.shp").

    • Repeat the above process to import the "BaseMuncieStructsFinalFuture.shp".
      • Be sure to select the correct structure inventory file "BaseMuncieStructsFinalFuture.shp" (e.g., C:\Workshops\FDA\data\MuncieFinal\QSGStudyData\StructureInventories\future-year_without-project).

      • And make the correct selections for the Import Attributes:

        Name

        Import Attributes Selection

        Structure IDTARGET_FID
        Occupancy Typeocctype
        Foundation Heightfound_ht
        Ground Elevation Valueground_elv
        Structure Valueval_struct
        Content Valueval_cont
        Vehicle Valueval_vehic
        Number Of StructuresNumStructs
      • Click Next and Finish to import the structure inventory.

  14. Import the Nonstructural Inventory for the Base Year ("NonstructuralMuncieStructsFinal.shp").

    • Repeat the above process to import the "NonstructuralMuncieStructsFinal.shp".
      • Be sure to select the correct structure inventory file "NonstructuralMuncieStructsFinal.shp" (e.g., C:\Workshops\FDA\data\MuncieFinal\QSGStudyData\StructureInventories\base-year_with-project).

      • And make the correct selections for the Import Attributes:

        Name

        Import Attributes Selection

        Structure IDTARGET_FID
        Occupancy Typeocctype
        Foundation HeightNewFunHt
        Ground Elevation Valueground_elv
        Structure Valueval_struct
        Content Valueval_cont
        Vehicle Valueval_vehic


      • Click Next and Finish to import the structure inventory.

  15. Import the Nonstructural Inventory for the Future Year ("NonstructuralMuncieStructsFinalFuture.shp").

    • Repeat the above process to import the "NonstructuralMuncieStructsFinalFuture.shp".
      • Be sure to select the correct structure inventory file "NonstructuralMuncieStructsFinalFuture.shp" (e.g., C:\Workshops\FDA\data\MuncieFinal\QSGStudyData\StructureInventories\future-year_with-project).

      • And make the correct selections for the Import Attributes:

        Name

        Import Attributes Selection

        Structure IDTARGET_FID
        Occupancy Typeocctype
        Foundation HeightNewFunHt
        Ground Elevation Valueground_elv
        Structure Valueval_struct
        Content Valueval_cont
        Vehicle Valueval_vehic
        Number Of StructuresNumStructs


      • Click Next and Finish to import the structure inventory.

  16. Create and Compute four Stage-Damage Functions for the without and with-project the Base Year functions and the without and with-project Future Year functions. Use the information in Table 7 to create and compute the four new stage-damage relationships.

    Table 7 – Configuration Selections for Four Stage-Damage Functions
    Stage-Damage Function NameAnalysis YearWater Surface ElevationStructuresFrequency FunctionStage-Discharge Function
    Existing Stage-Damage2031Existing ConditionExisting_BaseSIExisting Condition LP3sExisting Condition Relationship
    Existing_Future2080Existing ConditionFuture_WithoutSIExisting Condition LP3sExisting Condition Relationship
    Nonstructural2031Existing ConditionWith-projectSIExisting Condition LP3sExisting Condition Relationship
    Nonstructural_Future2080Existing ConditionWith-project_FutureSIExisting Condition LP3sExisting Condition Relationship
    • From the Study Tree, under Economics, right-click on Aggregated Stage-Damage Functions and select Create New Stage-Damage Functions. The Create New Stage-Damage Functions opens as a tab.
      • Enter a name for the new function in the Name box (e.g., Existing Stage-Damage), and enter a description for the relationship (e.g., HEC-FDA Version 2.0 Workshops Existing Conditions Function).
      • Select the Computed radio button and enter the information identified below (if you've been following the naming convention identified in the workshops your options should be the same).
      • After you complete the configuration, click Compute Curves. Wait until HEC-FDA generates the curves. Scroll through the list of computed curves (you should generate 28 curves, 16 for the Left-Bank and 12 for the Right-Bank). 
      • Click Save and the created stage-damage functions for the without-project base conditions displays in the Study Tree.
    • Repeat these steps to create the other three stage-damage functions using the information provided in Table 7. Each function should generate 28 curves, 16 for the Left-Bank and 12 for the Right-Bank.

Part 1 – Discussion Questions


Test Your Knowledge - Question 1

Why do we have a different stage-discharge relationship for the levee, but none of the other alternatives? 

Test Your Knowledge - Question 2

Consider the shape of the regulated-unregulated transform function for the detention basin. The most-likely flow value dips and then returns to the baseline. Why does the most-likely flow value return to the baseline?

Test Your Knowledge - Question 3

If structures were acquired instead of being elevated in the nonstructural plan, how would the stage-damage function change?

Hint: Consider how damage will change as stage changes. 


Return to top of page.

Part 2

Part 2 – Overview Table

Part 2 requires you to continue your project creating by adding (or creating and computing) the study data defined in Table 2.

Table 2 - Part 2 Study Data
Study DataExample Short NamesLong NamesDescriptions

Scenarios

  • WOP_Base
  • WOP_Future
  • Levee_Base
  • Levee_Future
  • DetentionBase
  • DetentionFuture
  • NS_Base
  • NS_Future
  • LeveeDetention_Base
  • LeveeDetention_Future
  • Levee_NS_Base
  • Levee_NS_Future
  • Detention_NS_Base
  • Detention_NS_Future
  • Without Base
  • Without Future
  • Levee Plan Base
  • Levee Plan Future
  • Detention Plan Base
  • Detention Plan Future
  • Nonstructural Plan Base
  • Nonstructural Plan Future
  • Levee & Detention Plan Base
  • Levee & Detention Plan Future
  • Levee & Nonstructural Plan Base
  • Levee & Nonstructural Plan Future
  • Detention & Nonstructural Plan Base
  • Detention & Nonstructural Plan Future
  • Without-project, base year
  • Future without-project most-likely future year
  • Levee only with-project, base year
  • Levee only with-project, future year
  • Detention only with-project, base year
  • Detention only with-project, future year
  • Nonstructural Plan only with-project, base year
  • Nonstructural Plan only with-project, future year
  • Levee and Detention with-project, base year
  • Levee and Detention with-project, future year
  • Levee and Nonstructural with-project, base year
  • Levee and Nonstructural with-project, future year
  • Detention and Nonstructural with-project, base year
  • Detention and Nonstructural with-project, future year

Alternatives

  • WOP
  • LeveeOnly
  • DetentionOnly
  • NS_Only
  • Levee_Detention
  • Levee_NS
  • Detention_NS
  • Without Project
  • Levee Only Plan
  • Detention Only Plan
  • Nonstructural Only Plan
  • Levee and Detention Plan
  • Levee and Nonstructural Plan
  • Detention and Nonstructural Plan
  • Without-project base year and most-likely future year
  • Levee only with-project base year and most-likely future year
  • Detention only with-project base year and most-likely future year
  • Nonstructural only with-project base year and most-likely future year
  • Levee and Detention with-project base year and most-likely future year
  • Levee and Nonstructural with-project base year and most-likely future year
  • Detention and Nonstructural with-project base year and most-likely future year

Part 2 – Instructions

Continue using the FDA study you created in Part 1.

  1. Create the scenarios for the two analysis years for each plan. Use the information in Table 8.

    Threshold Stage

    Recall the threshold stage is the index by which system performance statistics are calculated. Also, FDA will not automatically identify the threshold stage for impact areas without levees for with-project condition scenarios, the user will need to specify those stages. 

    Table 8 - Scenarios for Workshop 6
    Scenario (Short Names)Analysis YearStage-Damage FunctionsFrequency Relationship*Regulated-Unregulated Flow*Stage-Discharge*Lateral StructuresThreshold Stage**
    WOP_Base2031Existing Stage-DamageExisting Condition LP3sNoneExisting Condition RelationshipNoneCompute Default Thresholds
    WOP_Future2080Existing_FutureExisting Condition LP3NoneExisting Condition RelationshipNoneCompute Default Thresholds
    Levee_Base2031Existing Stage-DamageExisting Condition LP3NoneWith-Project ConditionLevee (Left-Bank Only)Left-Bank: Levee
    Right-Bank: WOP_Base, Right-Bank
    Levee_Future2080Existing_FutureExisting Condition LP3NoneWith-Project ConditionLevee (Left-Bank Only)Left-Bank: Levee
    Right-Bank: WOP_Future, Right-Bank
    DetentionBase2031Existing Stage-DamageExisting Condition LP3With-Project TransformExisting Condition RelationshipNoneLeft-Bank: WOP_Base, Left-Bank
    Right-Bank: WOP_Base, Right-Bank
    DetentionFuture2080Existing_FutureExisting Condition LP3With-Project TransformExisting Condition RelationshipNoneLeft-Bank: WOP_Future, Left-Bank
    Right-Bank: WOP_Future, Right-Bank
    NS_Base2031NonstructuralExisting Condition LP3NoneExisting Condition RelationshipNoneLeft-Bank: WOP_Base, Left-Bank
    Right-Bank: WOP_Base, Right-Bank
    NS_Future2080Nonstructural_FutureExisting Condition LP3NoneExisting Condition RelationshipNoneLeft-Bank: WOP_Future, Left-Bank
    Right-Bank: WOP_Future, Right-Bank
    LeveeDetention_Base2031Existing Stage-DamageExisting Condition LP3With-Project TransformWith-Project ConditionLevee (Left-Bank Only)Left-Bank: Levee
    Right-Bank: WOP_Base, Right-Bank
    LeveeDetention_Future2080Existing_FutureExisting Condition LP3With-Project TransformWith-Project ConditionLevee (Left-Bank Only)Left-Bank: Levee
    Right-Bank: WOP_Future, Right-Bank
    Levee_NS_Base2031NonstructuralExisting Condition LP3NoneWith-Project ConditionLevee (Left-Bank Only)Left-Bank: Levee
    Right-Bank: WOP_Base, Right-Bank
    Levee_NS_Future2080Nonstructural_FutureExisting Condition LP3NoneWith-Project ConditionLevee (Left-Bank Only)Left-Bank: Levee
    Right-Bank: WOP_Future, Right-Bank
    Detention_NS_Base2031NonstructuralExisting Condition LP3With-Project TransformExisting Condition RelationshipNoneLeft-Bank: WOP_Base, Left-Bank
    Right-Bank: WOP_Base, Right-Bank
    Detention_NS_Future2080Nonstructural_FutureExisting Condition LP3With-Project TransformExisting Condition RelationshipNoneLeft-Bank: WOP_Future, Left-Bank
    Right-Bank: WOP_Future, Right-Bank

    * Unless noted (e.g., "Left-Bank Only") the above files are assigned to both impact areas (Left-Bank and Right-Bank).
    ** Recall the threshold stage is the index by which system performance statistics are calculated and there are four different cases for determining the threshold value (please review the Target Threshold section of the Scenarios page in HEC-FDA User Manual for more information).

    Click Set!

    When entering the threshold value for the left-bank impact area (e.g., Detention Base Year scenario), you must click Set before you navigate to the right-bank impact area. If you click Save without defining the right-bank then a Save with Errors warning message will open to warn you that the right-bank impact area is not defined. Click OK, to close the warning message and then define the right-bank impact area. If you fail to Set or Save the left-bank impact area before navigating to the right-bank, then FDA will reset to "0" rather than the value you entered.


    1. Compute the two without-project scenarios and view the summary results.
    2. Record the Without Base Year and Without Future Year the Performance Parameters, Threshold Value for the following each analysis year (2031 and 2080) and impact area (Left-Bank and Right-Bank).
    3. Create the remaining 12 With-Project Scenarios. Using the recorded Threshold Values calculated in Step 5 and the information in Table 8 to create and compute the 12 with-project scenarios.
    4. For the impact areas in the with-project scenarios, manually enter and set the threshold stage, by unchecking the Calculate Default Threshold checkbox and entering the project performance threshold in the Threshold Stage box. Be sure to save the entered threshold stage by clicking, Set.

      Warning!

      This quick how-to does not show you the value you enter for your study, just how-to find the value (may or may not match your study results). As identified in Table 8 you must use the corresponding analysis year and impact area for manually entering the Threshold Stage. 

      Quick How-to find a without-project scenario's threshold stage
  2. Create the Alternatives. Use the information in Table 9 to create and compute the 7 alternatives.
    Table 9 - Scenarios for Workshop 6
    Alternative NameBase Year ScenarioFuture Year Scenario
    Without-ProjectWithout Base Year (2031)Without Future Year (2080)
    LeveeOnlyLevee Plan Base Year (2031)Levee Plan Future Year (2080)
    DetentionOnlyDetention Plan Base Year (2031)Detention Plan Future Year (2080)
    NSonlyNonstructural Plan Base Year (2031)Nonstructural Plan Future Year (2080)
    Levee_DetentionLevee & Detention Plan Base Year (2031)Levee & Detention Plan Future Year (2080)
    Levee_NSLevee & Nonstructural Plan Base Year (2031)Levee & Nonstructural Plan Future Year  (2080)
    Detention_NSDetention & Nonstructural Plan Base Year (2031)Detention & Nonstructural Plan Future Year  (2080)

     

  3. Create Alternative Comparison Report. Use the information in Table 10 to create the alternative comparison report.

    Table 10 - Alternative Comparison Report
    Alternative Comparison Report NameWithout Project SelectionWith Project Selection


    All Measures


    Without-Project

    		LeveeOnly
    DetentionOnly
    NSonly


    All Plans


    Without-Project

    		Levee_Detention
    Levee_NS
    Detention_NS




    All Alternatives




    Without-Project

    		LeveeOnly
    DetentionOnly
    NSonly
    Levee_Detention
    Levee_NS
    Detention_NS


Part 2 – Discussion Questions

Test Your Knowledge - Question 4

If the local sponsor is most concerned about impacts to residential structures, which plan might become the locally preferred plan?

Test Your Knowledge - Question 5

Why does the levee performance not change from the base year to the future year?

Test Your Knowledge - Question 6
Why is AAEQ negative on the right-bank for the levee-only plan?

Hint

View the Alternative Comparison Report, for the Levee Only Plan, AAEQ damage measure, and the Damage by Impact Area report.

Test Your Knowledge - Question 7

If the levee is to be included as a measure in the selected plan, which plan might be chosen? Hint: induced damages must be mitigated.

Conclusion

Download the solution project below to compare to your project:

With Levee Failure Curve:  Zip

Without Levee Failure Curve: Zip

Review the best answers to test your FDA knowledge questions and compare with yours to see how you did!

Return to top of page.

Test Your Knowledge - Question 1

Why do we have a different stage-discharge relationship for the levee, but none of the other alternatives? 

Answer: The levee keeps water in the channel that would once spread out in the area that is now kept dry by the levee.

Test Your Knowledge - Question 2

Consider the shape of the regulated-unregulated transform function for the detention basin. The most-likely flow value dips and then returns to the baseline. Why does the most-likely flow value return to the baseline?

Answer: This represents the detention basin reaching its volume capacity. At this point, the detention basin no longer provides flood risk reduction benefits. 

Test Your Knowledge - Question 3

If structures were acquired instead of being elevated in the nonstructural plan, how would the stage-damage function change?

Hint: Consider how damage will change as stage changes.

Answer: The stage-damage function will shift to the right. Damage for a given stage will be reduced at all stages. A greater stage will be required to reach the same level of damage in the without-project condition.

Note: Your results may not exactly match the results shown here. That's a product of variation in the software since this workshop was created and does not indicate that you did something wrong. Your results should follow the same trends and the values should be somewhat close to the ones shown below.

Test Your Knowledge - Question 4

If the local sponsor is most concerned about impacts to residential structures, which plan might become the locally preferred plan?

Answer: Nonstructural-Only, because it exclusively protects residential homes and none of the project costs go to anything else.

Test Your Knowledge - Question 5

Why does the levee performance not change from the base year to the future year?

Answer: The only change from base to future year is the number of structures. Performance is not dependent on the assets in the study area.

Test Your Knowledge - Question 6

Why is AAEQ negative on the right-bank for the levee-only plan?

Answer: Because the levee causes increased stages for a given discharge. The right-bank has no levee, so higher stages mean increased damages. The left-bank has a levee, so the higher stages don't reach the left-bank.

Test Your Knowledge - Question 7

If the levee is to be included as a measure in the selected plan, which plan might be chosen? Hint: induced damages must be mitigated.

Answer: Levee + DB, because the DB (Detention Basin) is the only measure that reduces damages on the right-bank, which is where the levee induces damages.

Related Topics

For the list of resources below, either select a specific page to view the related information, or click on a page label to see all the pages for a specific topic (e.g., fda_help_resources).