Powerline Plan and Environ. Assessment Jan. 2013 - Flood Control ...

Powerline Flood Retarding Structure
Pinal County, AZ
Draft Supplemental Watershed Plan
and Environmental Assessment
NRCS Table 5 - Estimated Average Annual Flood Damage Reduction Benefits
Powerline FRS
Apache Junction-Gilbert Watershed, Maricopa and Pinal Counties, AZ
(Dollars) 1/
Item
Future With Project
Ag. Related Non-Ag. Related Ag. Related
Future Without Project
Non-Ag.
Related
Total Damage
Reduction
Benefits
Benefits of All
Alternatives
(Average
Annual
Equivalent
Value 2 )
Floodwater
Residential $13,113,100 $13,113,100 $0 $0
Commercial/Industrial $80,700 $80,700 $0 $0
Institutional $32,500 $32,500 $0 $0
Agriculture $677,300 $677,300 $0 $0
Infrastructure
Roadways $8,100 $8,100 $0 $0
Irrigation Canal $100 $100 $0 $0
Insurance Administration Costs $309,000 $309,000 $0 $0
TOTAL $677,400 $13,543,400 $677,400 $13,543,400 $0 $0
1/ Price Base 2012. Amortized for 103 years at 3.75 percent.
January 2013
2/ Calculated as follows: calculate present value of damage reduction in each year, sum the present values, and then calculate the amortized annual amount (“average equivalent
value”) that would yield the present value sum. Present value and amortization use the discount rate of 3.75%. The benefits of the project are tied to reducing the risk of catastrophic
failure of the existing structures and thus reducing the risk to life and property, as described in the plan.
USDA- NRCS Page 8-13 January 2013
Kimley-Horn and Associates, Inc.