Approaches for Determining and Complying with TMDL Requirements Related to Roadway Stormwater Runoff (2019) / Chapter Skim
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Pages 92-99
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From page 92... ...
92 This chapter shows the state DOT how to construct a cost and effectiveness analysis for BMPs. It provides guidance to state DOTs for determining the cost of complying with TMDL requirements and to compare those costs to the value of the expected benefits.
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Best Management Practice Cost and Effectiveness Analysis 93 these costs significantly. For instance, utility conflicts can be a significant cost component and, where space is limited, additional costs may also be associated with material delivery and storage.
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94 Approaches for Determining and Complying with TMDL Requirements Related to Roadway Stormwater Runoff 2. Quickly compare several BMPs for a given drainage area.
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Best Management Practice Cost and Effectiveness Analysis 95 site-specific cost data. An example of the detail in the capital cost determination is provided by the following list of items included for bioretention facilities: • Mobilization • Clearing and grubbing • Planting media • Pea gravel • Gravel • Mulch • Slotted PVC underdrain pipe • Excavation and grading • Hauling and disposal of excavated material • Finish grading (yd2)
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96 Approaches for Determining and Complying with TMDL Requirements Related to Roadway Stormwater Runoff description is drawn largely from Guidelines for Preparing Economic Analyses (National Center for Environmental Economics 2014)
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Best Management Practice Cost and Effectiveness Analysis 97 One way or another, this comparison is what revealed and stated preference valuation methods are designed to do. The economic valuation of an environmental improvement is the dollar value of the private goods and services that individuals would be willing to trade for the improvement at prevailing market prices.
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From page 98... ...
98 Approaches for Determining and Complying with TMDL Requirements Related to Roadway Stormwater Runoff Only a few benefits can be assessed based on actual cost. One analysis that is somewhat common in the literature is to value the benefits of achieving bacterial water quality standards for contact recreation.
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From page 99... ...
Best Management Practice Cost and Effectiveness Analysis 99 be the most cost-effective alternative. Examples of strategies include payment in lieu and costsharing BMP implementation within the watershed but outside the highway right-of-way.
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