Guidelines for Evaluating and Selecting Modifications to Existing Roadway Drainage Infrastructure to Improve Water Quality in Ultra-Urban Areas (2012) / Chapter Skim
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Pages 104-108
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104 Cost evaluation is a vital component in the practicality assessment of retrofit alternatives. This section describes the factors that affect retrofit costs and presents general retrofit cost information and cost reduction strategies.
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105 Schueler, 2007; Schueler et al., 2007)
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106 Longevity: The longevity of a BMP is affected by factors such as maintenance (most importantly) ; deterioration of materials (as in a filter)
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107 in terms of cost per volume treated are surface storage and vegetated facilities, including detention and infiltration basins and vegetative filtration BMPs. A few types of catch basin retrofits, GSRDs, and proprietary hydrodynamic systems also have good to moderate cost effectiveness.
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108 • Reducing mobilization, traffic-control, and equipment costs, and generally increasing the economies of scale during construction; and • Reducing regulatory compliance cost by using a single permit for the entire project. DOT retrofit programs should emphasize long-range planning to coordinate retrofits with other highway improvement projects.
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