FLOOD07306

• County: Weld
• Community: Greeley
• Stream Name: Cache La Poudre River
• Basin: South Platte
• Title: Cache La Poudre River General Investigation Study, Greeley, CO
• Date: 5/1/2005
• Prepared For: Greeley
• Prepared By: USACE, Omaha, NE
• Floodplain - Doc Type: Project

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Compute EADs under with-, without-, and future-without project conditions (Phase
I). A plan will be developed for each alternative considered in the analysis, Each plan may
require adjustments to the water surface profiles and the structures included in the floodplain to
reflect proper conditions under each alternative, The HEC-FDA model will then be used to
compute the expected annual damages (EAD) to structures, contents, and externalities for with-,
without-, and future, without project conditions.

Task 4: Compute National Economic Development (NED) Benefits

Determine flood benefits for structures/contents for each alternative (Phase I). The
economist will determine the flood benefits for structures/contents/externalities for each
alternative based on the output provided by the HEC-FDA model.

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Determine NFIP Administrative Cost Avoidance Benefits of Alternative Plans (Phase
I). From the model output, the number of homes in the lOO'year flood plain under without,
project conditions will be determined, The number of homes in the lOO-year flood plain will
then be determined for each alternative plan, This number of homes will be multiplied by the
current National Flood Insurance Program (NFIP) annual per-policy administrative costs cited in
the Economic Guidance Memorandum (EGM) for the current Fiscal Year to determine annual
NFIP administrative costs under without'project conditions, This number of homes will be the
difference between the number of homes in the lOO-year flood plain under without,project
conditions and each alternative plan will be multiplied by the current NFIP per-policy
administrative costs cited in the EGM for the current Fiscal Year to determine annual NFIP
administrative costs reduced under each plan, The difference in the annual NFIP administrative
cost under without'project and each alternative plan is considered a cost avoidance benefit.

Determine Benefits of Public Damage/Emergency Cost Rednction (Phase I). The
public facility damages and emergency, evacuation, and cleanup costs will be calculated as a
percentage of the EAD,

Evaluate Possible Recreation Benefits (Post-Phase I). If in agreement with the non-
federal sponsors and consistent with Federal interest, the Corps NED analysis will consider any
opportunities, which, the project affords for outdoor recreation, The economist will perform a
recreation analysis, using the most appropriate method for considering recreational benefits,

Benefit-Cost Analysis (Phase I). The economic analyst will calculate the flood damages
and annual benefits, categorized by type, for each alternative that was not eliminated during plan
formulation. Based on the Micro-Computer Assisted Cost Estimating System (M,CACES)
project costs and schedule of expenditures provided by the cost estimator and project manager,
using current interest rates and a project life consistent with ERl105-2-100, the economic analyst
will calculate the Interest during Construction (IDC) for these alternatives. Using annual
benefits and costs based on price levels for the same month and year, the net annual benefits and
the benefit-cost ratio will be computed for these alternatives,

Task 5: Evaluate National Ecosystem Restoration (NER) Plans.

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