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This introduction focus on: An overview of the Highway Runoff Manual. The definition of Minimum Requirements; What is a TDA? BMP (Best Management Practices) Summary of Major Changes from 2014 to 2019 HRM. General Revisions Throughout the Manual. • Clarified WSDOT stormwater policies and design criteria to Who maintains the Highway Runoff Manual (HRM)?. The Headquarters Environmental Services Office Stormwater and Watersheds Program and Headquarters Hydraulics