We provided design services for phases two and three of the Target Green Marlborough East-Middle Blue River Basin Green Infrastructure & Distributed Storage Improvements for the City of Kansas City, Missouri Water Services Department.
The phase two design provides a system of distributed storage facilities at key points in the 375 acre watershed to reduce combined sewer overflows at Outfall 069 in the Marlborough neighborhood. For phase three, the preliminary design and basis of design report provides a system of distributed storage facilities at key points in the 375 acre watershed to reduce combined sewer overflows at Outfall 069 in the Marlborough neighborhood.
Phase Two
The primary objective of the design is to show a reduced frequency of overflows of the combined sewer system to not more than six events in a typical year. Currently, the overflow frequency at these outfalls is more than 36 times per year. Only rainfall events in excess of the design storm are allowed to overflow the two outfalls. To accomplish the primary goal, a system of distributed storage measures was designed to store and attenuate stormwater runoff. Target Green East Marlborough Phase 2 includes a combination of larger regional green infrastructure solutions, and small distributed green infrastructure solutions. Approximately 130 acres of stormwater is being directed to green infrastructure facilities before entering the existing combined sewer system. The green infrastructure is enhancing public spaces and surrounding community.
Arleta Park is a large-scale storage facility with conveyance methods necessary to convey runoff to Arleta Park. Improvements within the park include cascading rain gardens, centralized bioretention basin, an extended detention basin and precast pretreatment chambers. The design of Arleta Park enhances the existing park aesthetics and function, incorporating cascading rain gardens, bio-swales and bioretention facilities. New walkways provide wanted improved connectivity and access to park amenities to the residents within the community.
On the north end of the neighborhood improvements to 74th Street from the Paseo to Prospect provides approximately 16 right-of-way bioretention cells, two cascading rain gardens, eight underground detention pipe storage, two underground infiltration storage cells, and two precast pretreatment chambers. The project has improved east-west connectivity for the Marlborough community. The green infrastructure improvements will be decentralized within the existing right-of-way. These improvements will supplement the volume of stormwater capture to reduce overflows at the outfall.