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Suggested Citation:"Appendix B - Present Value Interest Factor Table." National Academies of Sciences, Engineering, and Medicine. 2020. Incorporating the Costs and Benefits of Adaptation Measures in Preparation for Extreme Weather Events and Climate Change—Guidebook. Washington, DC: The National Academies Press. doi: 10.17226/25744.
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112 A P P E N D I X B Present Value Interest Factor Table Period (Years) 1% 3% 5% 7% 10% 1 0.9901 0.9709 0.9524 0.9346 0.9091 2 1.9704 1.9135 1.8594 1.8080 1.7355 3 2.9410 2.8286 2.7232 2.6243 2.4869 4 3.9020 3.7171 3.5460 3.3872 3.1699 5 4.8534 4.5797 4.3295 4.1002 3.7908 6 5.7955 5.4172 5.0757 4.7665 4.3553 7 6.7282 6.2303 5.7864 5.3893 4.8684 8 7.6517 7.0197 6.4632 5.9713 5.3349 9 8.5660 7.7861 7.1078 6.5152 5.7590 10 9.4713 8.5302 7.7217 7.0236 6.1446 11 10.3676 9.2526 8.3064 7.4987 6.4951 12 11.2551 9.9540 8.8633 7.9427 6.8137 13 12.1337 10.6350 9.3936 8.3577 7.1034 14 13.0037 11.2961 9.8986 8.7455 7.3667 15 13.8651 11.9379 10.3797 9.1079 7.6061 20 18.0456 14.8775 12.4622 10.5940 7.8237 25 22.0232 17.4131 14.0939 11.6536 9.0770 30 25.8077 19.6004 15.3725 12.4090 9.4269 35 29.4086 21.4872 16.3742 12.9477 9.6442 40 32.8346 23.1148 17.1591 13.3317 9.7791 45 36.0945 24.5187 17.7741 13.6055 9.8628 50 39.1961 25.7298 18.2559 13.8007 9.9148 75 52.5871 29.7018 19.4850 14.1964 9.9921 100 63.0289 31.5989 19.8479 14.2693 9.9993

Next: Appendix C - Climate Information, Design Guidelines, and Data Sources »
Incorporating the Costs and Benefits of Adaptation Measures in Preparation for Extreme Weather Events and Climate Change—Guidebook Get This Book
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Extreme weather events and a changing climate increasingly boost costs to transportation agencies and to the traveling public. While Departments of Transportation (DOTs) are taking into account changing climate and extreme weather when making infrastructure decisions, they typically are not using a formal set of tools or cost-benefit analyses (CBAs) to address climate resilience because they may be too time-consuming and expensive to conduct routinely.

The TRB National Cooperative Highway Research Program's NCHRP Research Report 938: Incorporating the Costs and Benefits of Adaptation Measures in Preparation for Extreme Weather Events and Climate Change—Guidebook was developed to try to fill the gaps identified by DOTs. It is intended to provide a consolidated resource for transportation practitioners to be able to more readily consider CBAs as a tool in their investment-decision making processes when considering different climate and extreme weather adaptation alternatives.

This report has additional resources, including a web-only document NCHRP Web-Only Document 271: Guidelines to Incorporate the Costs andBenefits of Adaptation Measures in Preparation for Extreme Weather Events and Climate Change, a Power Point presentation that describes the research and the results, a spreadsheet tool that provides an approximate test to see if it would be cost-effective to upgrade assets to the future conditions posed by climate change, and a spreadsheet tool that uses existing conditions without climate change only to calculate the new return period for future conditions with climate change.

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