Green Streets create the opportunity to transform a potentially significant storm water and pollutant source into an innovative treatment system.
“Green infrastructure, unlike traditional ‘gray’ infrastructure approaches to storm water management, provides multiple benefits to communities,” Moore said. “Planting more trees and landscaping in public spaces cleans the air, cools the land, provides more habitat for wildlife, adds green maintenance jobs, increases property values and promotes a better, healthier quality of life for San Diego County residents and visitors.”
Established as an outreach tool, the guidelines serve as a companion to the county’s Best Management Practice (BMP) Design Manual, and is used by developers and engineers throughout the county. One capital improvement project that has implemented these guidelines is the $20 million widening and improvement of Cole Grade Road that is targeting completion in 2020. WSP reviewed the green infrastructure plans for part of the project on behalf of the county.
“Green Streets design criteria lay out general definitions, general policy and landscape design criteria for green infrastructure strategies,” Moore said. “It includes construction details that can be referenced in improvement plans, and a suggested maintenance schedule that includes a list with tasks, frequency, and time of year for initial, routine, and as-needed maintenance for each strategy.”
Green Streets specifications also include detailed construction material and installation requirements for strategies, including aggregates, geosynthetics, underdrains, permeable pavement, engineered soil media, mulch, overflow risers, check dams and tree grates.
“Green infrastructure has the added benefit of promoting water conservation with low water use and drought tolerant plants, and improving groundwater supplies through infiltration.” Moore said.