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 69-82
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From page 69... ...
69 Section 4 describes the available BMP options from which retrofit planners must identify, adapt, and ultimately select BMPs that can meet the retrofit goals and constraints. The initial screening of BMP options should be based primarily on the treatment capabilities of the BMPs using the following criteria: 1.
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Table 5.1. Ranking of BMP retrofit categories according to unit operation effective level.
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71 facilities, infiltration BMPs, and vegetated BMPs provide significant infiltration and evaporation losses. Retention basins and cisterns permanently capture stormwater, where it is reduced through infiltration and evaporation, or used for irrigation or other activities.
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72 indicators) through non-chemical agents including sunlight, ultraviolet (UV)
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73 1. Reduce flows from the drainage area (hydrological control)
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74 discharges. To calculate the percent capture, the inflow hydrograph is integrated to determine the total inflow volume and bypass/overflow volume for flows above the design discharge.
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75 on TSS standards. However, as discussed in Section 2.2.2, TSS measurement may under-represent particulate mass, and SSC may be a more appropriate measure.
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76 that provides a statistical view of influent and effluent quality (Oregon State University et al., 2006)
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77 Charbeneau et al., 2004)
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78 interstate agreement on the reciprocal evaluation, acceptance, and approval of innovative energy and environmental technologies. The TARP agreement resulted in the development of minimum sampling and testing protocols (TARP Tier II Protocol)
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79 across the country. Consequently, DOTs face a range of regulatory policies regarding the use of proprietary BMPs.
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Constituent Point of Discharge Dry Detention Basin (n = 25)
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Table 5.5. Qualitative BMP effectiveness ratings (low, medium, and high)
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Retrofit Category BMP Type Report Section with additional performance information References S S T s t n e i r t u N e t a l u c i t r a P d e v l o s s i D s t n e i r t u N h s a r T r e t t i L d n a s l a t e M l a t o T D s l a t e M d e v l o s s i a i r e t c a B c i n a g r O s t n a n i m a t n o C s t l a S d e v l o s s i D n o i t a u n e t t A w o l F n o i t c u d e R e m u l o V underdrains Media Filtration Sand filters (surface or underground) 4.7.2 BMP Database; Caltrans (2004)
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