Benefit–Cost Analyses Guidebook for Airport Stormwater (2019) / Chapter Skim
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Pages 37-45
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From page 37... ...
37 Identification of the relevant costs and estimation of reasonable values for them are crucial to conducting a useful BCA and can also be extremely challenging. Information on costs may help airports that wish to undertake a BCA internally with their own staff and may also help airport staff working with consultants ask informed questions.
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From page 38... ...
38 Benefit–Cost Analyses Guidebook for Airport Stormwater • Bidding situation (including how many bidders there are and other developments in the region that may compete for the pool of contractors) , • BMP type (costs more difficult to estimate for green infrastructure BMPs than for gray infrastructure, which is more standardized and lends itself more readily to cost estimating)
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From page 39... ...
Costs 39 other consultants used by other airports and large landholders may be relevant sources of information about costs for projects. 5.2.2 Communicating with Other Airports and Other Landholders Airport staff who are interested in stormwater infrastructure designs with which they and their engineers are less familiar may benefit from contacting other airports, port authorities, other transportation facilities (highway administrations)
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From page 40... ...
40 Benefit–Cost Analyses Guidebook for Airport Stormwater Organization Resource Description U.S. EPA Green Infrastructure Cost–Benefit Resources Links to examples of BCAs and tools.
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From page 41... ...
Costs 41 Multidisciplinary Digital Publishing Institute Performance and Cost Perspective in Selecting BMPs for Linear Projects Evaluates costs and performance effectiveness of BMPs that retain post-construction stormwater on site. Organization Resource Description American Society of Civil Engineers Cost-Estimating Tools for LowImpact Development Best Management Practices: Challenges, Limitations, and Implications Evaluates tools to estimate capital costs, O&M costs, and life-cycle NPV of vegetative roofs, rainwater catchment systems, and bioretention facilities.
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From page 42... ...
42 Benefit–Cost Analyses Guidebook for Airport Stormwater 5.3 Financial, Environmental, and Social Costs and Approaches to Assigning Value To the extent possible, the airport must assign values to anticipated costs so that they can be incorporated into the BCA. Assigning monetary values for costs may be more straight forward than for benefits because costs are more typically documented and tracked over time.
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From page 43... ...
Costs 43 Capital costs Permitting costs Suggested approaches: estimated number of hours of consultant time × hourly rate, total project cost × percentage. Suggested approaches: estimated number of hours for airport staff time (approximately 20 to 25 hours)
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From page 44... ...
44 Benefit–Cost Analyses Guidebook for Airport Stormwater Category Element Example Approaches to Assigning Value Social Inconvenience of service disruption to customers Customer costs associated with interruptions in airport operations while project is under construction or undergoing major maintenance. Suggested approaches: reduction in enplanements due to construction, hours lost by customers for delayed or cancelled flights, and hourly value of customer time.
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From page 45... ...
Costs 45 Cost Value Source Incurs up-front costs for planning, permitting, and construction Option 1: $2.4 million Option 2: $3.7 million Option 3: $3.6 million Source: costs on past projects at BAY, scaled costs from OSD's projects, and online stormwater BMP cost estimation tool. Notes: BAY's team used past BAY projects to estimate the cost of the dry detention basin and adjusted the costs to 2018 dollars to account for inflation.
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