- Municipal Green Stormwater Infrastructure
Burns & McDonnell is leading the Unified Government (UG) integrated overflow control plan (IOCP) team in addressing system overflows at the new Juvenile Justice Center. The UG is among many communities across the country under federal obligation to reduce or eliminate the volume of combined sewer overflow.
As redevelopment and infrastructure improvements are analyzed and designed for combined sewer areas of the UG, efforts are underway to understand the constraints and impacts of the downstream pipe system in addition to long-term obligations of the UG. With development of a new Juvenile Justice Center underway, the UG IOCP team is utilizing the project as an opportunity to pilot green stormwater infrastructure implementation in lieu of traditional stormwater management techniques to fulfill consent decree obligations and meet Environmental Protection Agency (EPA) goals.
Our team met with the lead architecture design firm, JreanorHL, to discuss plans for managing stormwater at the new site. The original plans included traditional stormwater installations, which risked increasing system overflows and backups, both of which could be detrimental to the community. The team strategized ways to incorporate green stormwater infrastructure into the design. Based on schedule, IOCP efforts and our previous stormwater experience, it was decided that the IOCP team would provide the green stormwater infrastructure design and collaborate with TreanorHL to incorporate it into the overall design plans.
This project serves as the UG’s first opportunity to analyze the impact of green stormwater infrastructure in the area as part of the federal consent decree improvements. The two primary development sites for this project include the new Juvenile Justice Center and the accompanying parking lot. Before project initiation, both sites contributed to a combined sewer overflow point on the Kansas River, the second-largest overflow location in the UG combined sewer system — about 180 million gallons of overflow annually.
The UG IOCP team is implementing green stormwater infrastructure, reducing stormwater connections to the existing system. The project incorporates a series of green stormwater infrastructure practices to treat stormwater generated from the project’s impervious area. The three primary types of green stormwater infrastructure include bioretention, stormwater tree planters, and permeable pavers to capture and infiltrate stormwater runoff from the parking lot surface, building roof leaders and adjacent streets.
The new Juvenile Justice Center is scheduled to be complete within the first quarter of 2020. Based on findings from the project, the UG will be better able to set precedent for green stormwater infrastructure in future community updates.
- First opportunity for UG to analyze the impact to stormwater by using green stormwater infrastructure
- 100 percent stormwater capture for storms with less than 1.37 inches of rainfall
- 57 stormwater trees
- 9,040 square feet of permeable pavers