Stormwater Management for San Joaquin Hills Transportation Corridor, Orange County, Californiaby Lan-Yin Li Weber, (M.ASCE),
Abstract: San Joaquin Hifis Transportation Corridor (SJHTC or Corridor) is one of the largest design-build toll roads in U.S.A. To meet stringent environmental mitigation requirements, to ensure flood safety, and to avoid maintenance and structural stabifity problems, the Corridor has incorporated special drainage design considerations in stonnwater management. This paper provides an overview of the stormwater management for SJHTC and presents special drainage features for the stated objectives. Highlights of drainage design include mitigation of runoff increases due to highway pavement effects, runoff retention for water quality treatment, separation of pavement runoff from slope runoff to allow water quality treatment feasible, scour protection for channel crossings and storm drains, and freshwater habitat and salt marsh preservation and enhancement. Overall, the stormwater management system of the Corridor defines a higher drainage standard for advanced transportation projects as compared to conventional highway design.
Subject Headings: Stormwater management | Drainage | Transportation corridors | Highway and road design | Water quality | Runoff | Hydraulic design | North America | California | United States
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