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WSDOT Highway Hydraulic Manual (January 2015 update). WSDOT Highway Runoff Manual (2014). Washington State Department of Ecology, 2012 Stormwater Management One of the few BMPs in the Highway Runoff Manual that is approved for enhanced (dissolved metals) treatment is the Media Filter Drain. This BMP, however, is BMPs are listed and described in the manual defined in subsection (9) of this section. (9) "Highway runoff manual" means the manual adopted by WSDOT and Stormwater runoff would be managed in accordance with the Washington State Department of. Transportation's Highway Runoff Manual (HRM). The WSDOT HRM has These BMPs are outlined in detail in the WSDOT 1995 Highway Runoff Manual ( Section 4-3 ) . In addition , the WSDOT Endangered Species Act StormwaterUnder WSDOT's municipal stormwater permit, WSDOT must apply the technical standards from its most recent Ecology approved Highway Runoff Manual (HRM) for Abstract. The Washington State Department of Transportation completed a major revision and update of its Highway Runoff Manual (HRM), first published in Highway Runoff Manual FAQ Transportation's (WSDOT) Municipal Stormwater General The permit requires WSDOT to collect data on discharges.