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•' City of Santa Ana On -Call Stormwater Project Design Services RFP No.: 20-102 Green Streets Runoff is captured and conveyed along streets until drainage infrastructure, such as catch basins, is reached. This makes streets a great location to implement stormwater capture systems. Green streets are found to be most beneficial on streets that capture local drainage, the parkway is wider, and the slopes are low or mild. Different types of BMPs can be used on streets, such as subsurface infiltration, open bioretention or bioswales, street trees, and more, as demonstrated in some of the projects highlighted in our experience. Green infrastructure can be implemented in streets as its own project, coupled with street reconstruction/maintenance, or incorporated into complete streets (inclusive of bike lanes). Green streets can be used as regional solutions and there may even be opportunities to increase capture using a storm drain diversion. As part of our Laurel Canyon Boulevard Green Street Project, we designed green infrastructure in an area that did not have drainage infrastructure to provide water quality and flood control benefits. Implementing green infrastructure on streets is another way to utilize other funding programs targeted more towards transportation projects. Green infrastructure can also be coupled with programs like Safe Routes to School. We understand the City is planning to implement a City -Wide Street Drainage and Water Quality Improvement Project in multiple phases, which will include various green street elements. Table 3 Common Green Street Challenges and Constraints gies " Parkway is not very wide Incorporate surface and subsurface infrastructure to increase capture and/or utilize pervious pavement Landscape does not fit Biotreatment systems with covers to match existing sidewalk street aesthetics pavement may be used to match street aesthetics while improving water quality Outreach with businesses early and possibly allow them to be Business access involved in selecting green infrastructure or plant palette so they feel connected Utilities located in Conduct utility search early on and coordinate if needed with sidewalk utility companies, while opportunities to avoid utilities can be evaluated Conduct outreach, develop specifications that clearly identify Traffic concerns priorities and requirements for access, and consider night work on busy streets where impacts may result in significant lane closures Frequent catch basins Consider using culverts to allow low flows to bypass catch basins capture flows so that BMPs are not needed upstream of every catch basin -10- CW=