Fill 3 Needs with 1 BMP - Integrating Flood Control, Construction and Post Construction Water Quality Strategies at San Diego Airport
The San Diego Airport Rental Car Center (RCC) project included a massive two-million square foot structure on 24.8 acres of coastal property. Water quality and quantity challenges included undersized existing downstream drainage infrastructure, high groundwater table, and multiple resource agency oversight typical of coastal redevelopment projects. Groundwater in the coastal area was tidally influenced with historic groundwater levels coming within 10 feet of the finished surface. The project was designed and executed to meet the construction and post-construction stormwater requirements of the State Construction General Permit and the San Diego Regional MS4 Permit, as well as additional construction and post-construction stormwater management requirements imposed by the California Coastal Commission. The project was also designed to obtain Leadership in Engineering and Environmental Design (LEED) Gold certification. With multiple project constraints and stringent oversight, the design team from WSP|Parsons Brinckerhoff developed an innovative storm water management strategy that integrated conventional bioretention treatment with flood control elements that mitigated flows up to the 50 year storm event. While the multifunctional basin designs were intended to provide exceptional post construction treatment of storm water flows, 3 of the 7 basins were constructed and retrofitted as the 1st phase of the construction project to provide sediment capture for storms up to the 10 year storm event. The purpose of this presentation will be to summarize project constraints and requirements of the various oversight agencies, highlight the modifications of permanent BMP’s to handle Construction Stormwater Runoff and compliance, and will include an overview and more detail of the innovative storm water design solutions used at this site.
This presentation is a case study that will describe the tools and methodologies used to address multiple design criteria with the site layout and bioretention basin Best Management Practice (BMP). Attendees will gain key insight on how the design team took advantage of landscape setbacks, integrated the BMP’s, and determined which design criteria is most critical, thereby streamlining the project approval process. The basin retrofits and performance during the construction phase will also be presented along with the multiple design elements of the BMP’s that work collectively to address flood control, post construction water quality and construction requirements.
In order promote participant engagement the presentation will include a fly through of the site via google earth and time lapse imagery covering the construction stages of the site and storm water BMPs. Design details will also be presented that include the bioretention basin design elements such as the engineered soil substrate, underdrains, orifice and spillway structures.
A Hydrology Report, Stormwater Pollution Prevention Plan and a Standard Urban Storm Water Mitigation Plan (SUSMP) were developed for this project. Results indicated that peak flows from the 24.8 acre facility will be reduced to 3.75 cfs during the 50 year 24 hour storm event. A total Design Capture Volume (DCV) of 208,000 cubic feet was provided that exceeded the post construction requirement. During construction there was no record of the site discharging due to early construction of 3 of the basins that completely retained and infiltrated runoff during construction. This project received one additional exemplary credit point under LEED credit 6.1 storm water quality and had been used been visited during CASQA workshops to educate engineers of storm water BMP designs.
Jarrod Miller is the inland empire stormwater manager for WSP Parsons Brinckerhoff. Jarrod has a BA in environmental science from the University of Kansas and a Masters in Hydrology from Portland State University. His professional experience spans over 15 years serving all types of projects including land development, aviation, public works, transportation and industrial projects. Jarrod is also the national lead for the WSP Green Teams. He is a Certified Professional in Erosion and Control, Certified Professional in Stormwater Quality, Qualified SWPPP Developer and an Envision Sustainable Professional.
Kevin Fellows has 20 years of experience on a number of public and private projects. Kevin has been involved in various stages of project development including project study reports, planning studies, CEQA processing, final plans, specifications and estimate (PS&E), and construction engineering support throughout CA and has been working with NPDES Compliance since the late 1990’s and most recently focused on sustainable design.Kevin graduated from California State Polytechnic University Pomona with a BS in Civil Engineering and an Environmental Emphasis.
Richard Gilb is the Manager of Environmental Affairs at San Diego County Regional Airport Authority for the San Diego International Airport for the past 13+ years and is responsible for stormwater management. Richard has more than 25 years of experience in environmental issues and almost 20 years in stormwater management. He previously worked for the County of San Diego and for the Port of San Diego before joining the Airport Authority. He received a BS in geology from the University of Cincinnati and a Master of Public Health with a concentration in environmental protection from San Diego State University.