Drainage Master Plans
The West Washington Street Watershed Drainage Improvement project consists of four phases that include detention basins, rain gardens and storm sewer pipe upgrades at multiple locations throughout the watershed. Once fully implemented, the project will improve the flood protection level in the watershed to a 40-year level.
West Washington Street – Phase 1. This phase of the project was completed in November 2014. The project included the construction of Preservation Pond and storm sewer and street improvements around the intersection of Washington Street and Russell Street. A total of 10 acre-feet of stormwater storage was provided in this phase of the project at a cost of $5.2 million.
West Washington Street – Phase 2. Final design of Phase 2 of the West Washington Street Drainage Improvements was completed in September 2016. The project is eligible for an Illinois EPA revolving loan, which would cover approximately $9 million of the $13.9 million project costs. Pending final loan approval and finalization of the financing plan, this phase of the project would be ready to bid in November or December of 2016.
The primary stormwater management features on Phase 2 are a 19-acre-feet detention basin along westbound Glenn Park Drive and a new storm sewer to connect Preservation Pond to the proposed Phase 2 detention basin. Once completed, the Phase 2 detention basin will operate together with Preservation Pond to reduce flooding in the watershed.
In addition to the flood control elements, the Phase 2 detention basin will feature park-like amenities, similar to Preservation Pond, including a gazebo and waterfall, decorative lighting and fencing, multi-use paths, stone columns, rock outcroppings, rain gardens/bio-retention and native plantings. The final design of Phase 2 will blend with the existing Glenn Park to make one large continuous green space that will become a community amenity.
The Phase 2 project also includes the installation of a new storm sewer along Columbia Avenue in order to connect Preservation Pond to the new detention basin at Glenn Park Drive. In addition, the installation of secondary storm sewers is required along Garfield Avenue, Draper Avenue, Carson Avenue, Miller Avenue, Fair Street, and parts of Washington Street in order to address smaller local flooding areas. The streets in these areas will be completely reconstructed with new concrete pavement, curb and gutter, street lighting, and sidewalks. The goal of this is to provide new street infrastructure in areas that are disturbed as part of the storm sewer installation work.
West Washington Street – Phase 3. Phase 3 of the project consists of a new storm system that will be extended from Preservation Pond to the flooding areas located to the south. Specifically, storm sewers will be extended along Edwin Street, Church Street, James Street, Park Street, University Avenue and Flora Drive where flooding occurs in the watershed. The storm sewers in Phase 3 will discharge into Preservation Pond and eventually into the Phase 2 detention basin. Final design for Phase 3 is estimated to be approximately $700,000 and the construction cost is estimated to be approximately $6.6 million. It is anticipated that this phase of the project will also be eligible for an Illinois EPA revolving loan in an amount of $7.3 million, which would fund the entire project.
West Washington Street – Phase 4. Phase 4 is a future phase of the West Washington Street project that provides drainage improvements near the Bradley Avenue/McKinley Avenue intersection to address flooding at that location. This phase of the project would require a detention basin similar in size to Preservation Pond. Storm sewer improvements would also be required to direct stormwater from the flooding areas into the new detention basin. Very early estimates indicate a cost of approximately $7.0 million for this phase.
The Boneyard Creek North Branch Improvement Project can be divided into four geographic sections that include creek reconstruction with an adjacent lighted trail, new culverts for street crossings, detention basins, seating areas, stone column trail markers, landscaping, boulders, bioswales. Once implemented, the project will contain the 100-year flood within the creek channel and adjacent greenbelt and will improve the Washington Street viaduct to a 50-year level of protection. The project includes coordination with the City’s Bristol Place Redevelopment Project, which is within the project limits.
Preliminary design is substantially complete, as documented in the draft Boneyard Creek North Branch Improvement Project Program Development Report. After final design and property acquisition is complete, the project could be constructed in up to four construction contracts sequentially from downstream (University Avenue), upstream to Neil Street.
Boneyard Creek – University Avenue to Washington Street (Phase A). The downstream section of the project starts with a midblock pedestrian crossing across University Avenue, just east of the Boneyard Creek Second Street Basin University Avenue rain garden. Park and Hill Street pedestrian crossings will also be midblock; the crossing at Church Street will be at its intersection with Second Street.
The culvert under University Avenue will be replaced, as will culverts under the alley north of University Avenue, Park Street, Church Street, and Hill Street. A new pump station for the Washington Street viaduct will be constructed with underground storage (1 acre-foot).
The creek is proposed to be “daylighted” where it is currently in a culvert between University Avenue and the alley north of University Avenue. The creek will be reconstructed the remainder of its length to Washington Street with a lighted multipurpose trail the entire length of the improvement. Additional project improvements include seating areas, stone column trail markers, landscaping, boulders, and bioswales.
Boneyard Creek – Washington Street to Norfolk Southern Railroad (Phase B). The second section of the project extends from Washington Street north to the Norfolk Southern Railroad tracks with additional work done west of the Boneyard Creek.
The reconstructed Boneyard Creek and the associated lighted trail crosses Washington Street with a midblock pedestrian crossing between First and Second Streets. The trail extends north to a proposed pedestrian crossing across the Norfolk Southern Railroad track at the alley west of Ash Street. The Washington Street Detention Basin (12 acre-feet) will be constructed west of the trail between Washington Street and the railroad tracks along with seating areas, stone column trail markers, landscaping, boulders, bioswales, and play equipment along the trail.
This section includes a new culvert under Washington Street, renovation of the Washington Street viaduct with the addition of retaining wall and sidewalk on the south side and aesthetic improvements. Construction of the Columbia Avenue Detention Basin (8 acre-feet) is proposed at the east end of Columbia Avenue with an alternate location possible by increasing the size of the Washington Street Detention Basin. The final location will be determined in final design after additional stakeholder input. Combining the Columbia Avenue Detention Basin with the Washington Street Detention Basin would require the construction of a replacement culvert under the Canadian National railroad tracks.
Boneyard Creek – Norfolk Southern Railroad to Bradley Avenue (Phase C). This section of the project expands the Oak-Ash Detention Basin by 20-acre-feet and enhances the basin with the lighted trail, a secondary trail on a boardwalk, seating areas, stone column trail markers, landscaping, boulders, bioswales, and play equipment along the trail. The trail will extend north to Bradley Avenue. A classroom pavilion is proposed in the Oak-Ash basin area and a pavilion along the creek in Wesley Park. Trailhead parking is proposed near each pavilion.
A new creek alignment is proposed for the north part of this section to remove the creek from its current location under Herff Jones. The new alignment would cross the Canadian National railroad tracks in a new culvert south of Bradley Avenue, keeping the creek in a culvert between Oakwood Trace and the railroad tracks. The creek would then “daylight” across Wesley Park south to the north end of the Oak-Ash Basin. The existing culvert under the Canadian National railroad tracks would be retained to convey West Fork flow.
Boneyard Creek – Bradley Avenue to Neil Street (Phase D). The Boneyard Creek trail crosses Bradley Avenue with a midblock pedestrian crossing between Market Street and the Canadian National railroad tracks. The lighted trail extends north and west across the Bristol Park redevelopment area to a proposed pedestrian crossing across Market Street at Bellefontaine Street, then northwest across Champaign Street, Walnut Street, and Hickory Street to end at Neil Street east of Edgebrook Drive. Seating areas, stone column trail markers, landscaping, boulders, and bioswales will be constructed along the trail, in particular near the north end of Walnut Street. New culverts will be constructed under Bradley Avenue, and Garwood, Market, Champaign, and Walnut Streets.
The proposed Bristol Place Detention Basin (8-acre-feet) is shown with two alternate locations to allow flexibility with Bristol Place redevelopment coordination: either south or north of Bradley Avenue. A pavilion and playground are proposed in the Bristol Place area.
A second alternate is shown in this section near the west end of the project. The trail could be aligned along Howard Street in a straight line alignment to Neil Street or along the south side of the Howard Street properties between Walnut and Hickory Streets to minimize pedestrian traffic along the residential Howard Street. The final location will be determined in final design after additional stakeholder input.
On May 5, 2015, Council authorized an engineering drainage study in the Garden Hills Watershed that examined the causes of flooding and provided alternatives to reduce the flooding. The drainage study was completed in September 2016.
The drainage study found that the primary causes of the flooding were undersized storm sewer pipes and a lack of an adequate emergency overland flow path to the Copper Slough receiving channel. As a result of these drainage system inadequacies, the watershed floods with approximately 20-acre-feet of stormwater during a 50-year storm event. One of the other primary findings in the study was that the Hedge Road corridor was the lowest elevation in the watershed; and therefore, highly susceptible to flooding because stormwater runoff naturally funnels towards the lower elevations.
As part of the drainage study, multiple alternatives were examined to reduce flooding in the Garden Hills watershed including combinations of piping upgrades, open channel improvements, permeable surface options and detention storage. The most effective alternative was a combination of piping upgrades to transport stormwater from the watershed to a new detention basin located along the north side of Hedge Road. Locating the detention along Hedge Road is a sound stormwater management approach, since Hedge Road is the lowest elevation in the watershed. Placing the detention basin at this location takes advantage of the natural stormwater funneling effect mentioned in the previous paragraph. This detention basin will hold the excess stormwater runoff from the watershed and will include design elements so that the detention basin also functions as a neighborhood amenity.
Garden Hills – Phase 1. This phase of the project involves purchasing 46 properties along Hedge Road that are necessary to construct the proposed detention basin. The purchase of one additional property along Joanne Lane would also be necessary in order to connect the storm sewer system along Joanne Lane into the proposed detention basin along Hedge Road. Relocation assistance to property owners and renters and demolition of homes is also a part of this phase. The total cost for property purchases, relocation assistance and demolition is approximately $4.9 million.
Garden Hills – Phase 2. This phase of the project includes the construction of the proposed detention basin along the north side of Hedge Road and reconstruction of Hedge Road from Mattis Avenue to Hedge Court. The detention basin will be sized to hold between a 40 to 50-year storm event for the watershed. Similar to the West Washington Street project, the detention basin will feature park-like amenities such as walk paths, lighting, benches, water features, native plantings and a variety of other landscape features. Attachment H shows the site plan for the Hedge Road detention basin. Reconstruction of Hedge Road would follow a complete street concept, which includes new storm sewer piping, full concrete street reconstruction, sidewalks and street lighting. Costs are approximately $7.7 million for this phase.
Garden Hills – Phase 3. This phase includes the installation of large diameter trunk storm sewers that transport stormwater from the watershed to the Hedge Road detention basin. Trunk storm sewers would be installed along sections of Garden Hills Drive, Paula Drive and Cynthia Drive. The trunk storm sewer system is the primary storm sewer system for the watershed. Work on this phase would also include complete street reconstruction, sidewalks and street lighting. Costs are approximately $5.9 million for this phase.
Garden Hills – Phase 4. This phase includes the installation of smaller diameter storm sewers that would connect directly into the trunk storm sewer system or the Hedge Road detention basin. Connecting storm sewers would be installed along Summit Ridge Road, Thornton Drive, Garden Hills Drive, Williamsburg Drive, Holly Hill Drive, Summerlin Lane, Hedge Road, Anita Drive, Burnetta Street, Joanne Lane, Marigold Lane, Honeysuckle Lane, Melanie Lane, Kirk Lane, and a section of Jeanne Street. Work on this phase would also include complete street reconstruction, sidewalks and street lighting. Costs are approximately $12.0 million for this phase.
Garden Hills – Phase 5. The fifth and final phase of the project would be the reconstruction of the remaining streets out to the boundaries of the study area. Minor storm sewer improvements are anticipated in this phase; however, the majority of the work will be street reconstruction, sidewalk and street light installation. Costs are approximately $12.4 million for this phase.