The Fox River is bordered on the east by Illinois Route 25 and on the west by

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The Fox River is bordered on the east by Illinois Route 25 and on the west by Illinois Route 31. Along one stretch of the river, there is a distance of 16 miles between adjacent crossings. An additional crossing in this area has been proposed, and three alternative bridge designs are under consideration. Two of the designs have 25-year useful lives, and the third has a useful life of 35 years. Each bridge must be resurfaced periodically, and the roadbed of each bridge will be replaced at the end of its useful life, at a cost significantly less than initial construction costs. The annual benefits of each design differ on the basis of disruption to normal traffic flow along Routes 25 and 31. Given the information in Table P10-25, use the B€“C ratio method to determine which bridge design should be selected. Assume that the selected design will be used indefinitely, and use a MARR of 10% per year.


Table P10-25:

Bridge Design Capital investment Annual maintenance cost* Resurface (every fifth year)* Resurface (every seventh year)*

MARR
Minimum Acceptable Rate of Return (MARR), or hurdle rate is the minimum rate of return on a project a manager or company is willing to accept before starting a project, given its risk and the opportunity cost of forgoing other...
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Engineering Economy

ISBN: 978-0133439274

16th edition

Authors: William G. Sullivan, Elin M. Wicks, C. Patrick Koelling

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