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Cherry Creek Basin

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Cherry Creek Basin 6.2 Cherry Creek The Cherry Creek Mall Map Unit is comprised of a Basin Snapshot single basin (4600-02) from the Denver Storm Drainage Master Plan (SDMP) and has a total drainage area of Overall Score 62 approximately 2,930 acres or 4.6 square miles. Cherry Primary Sub-Score 52 Creek flows north through Denver to its confluence with Highest Primary Average annual pollutant loads Sub-Scores • Phosphorous (5/6) the South Platte River and is generally bounded by E. 6th • Nitrogen (5/6) Ave on the north, Colorado Blvd on the east, E. Arizona • Bacteria (5/6) Ave on the south, and N. Broadway on the west. The Monitoring • Nitrogen (4/4) entire map unit is within the City & County of Denver. • Phosphorous (3/4) The Cherry Creek Mall Map Unit basin is fully developed, Impervious Area w/in ROW (4/5) Existing % Treated (10/10) primarily with residential land uses but also includes the Cherry Creek Mall and the Denver Country Club as major Secondary Sub-Score 10 land users near the center of the Map Unit. Cherry Creek Highest Secondary Park Density (3/5) through the Denver Country Club is privately maintained Sub-Scores but includes five drop structures to help stabilize the creek and prevent bank erosion which can impair downstream There are over 50 individual outfalls to Cherry Creek reaches. Upstream of University Ave the banks have varying in size from 12-in RCP to 96-in x 60-in RCBC. been stabilized with soil rip-rap while still allowing the A number of these outfalls can be seen from the Cherry low flow channel to meander within the defined banks. Creek Bike Path. The Cherry Creek Bike Path begins These stabilization measures reduce TSS to downstream at Confluence Park and runs along the Cherry Creek receiving water bodies, including the South Platte River. for more than 40 miles to Franktown. This trail is one This is important because along with a TMDL for total of the most popular biking and jogging trails in Denver. suspended solids Cherry Creek also has a TMDL for The heavy use of the trail makes it an ideal location for bacteria and is on the M &E (monitoring and evaluation) stormwater and water quality education. list for metals. Cherry Creek Land Uses ROW/Other Residential Commercial Open Space 29% 47% 13% 11% Cherry Creek is a valuable recreational amenity in the heart of the City, With over 300 outfalls dumping directly into it, untreated stormwater enjoyed by residents and visitors alike. impacts Cherry Creek’s water quality and recreational enjoyment. page 104 EXISTING CONDITIONS Sub-Collection System 35-40 High 30-34 Medium-High 26-30 Medium 18-25 Medium - Low <=17 Low Existing Water Quality Pond Existing Treatment MS4 Outfall (21) N page 105 2 B 3 C A 1 BMP OPPORTUNITIES Regional and Sub-Regional Opportunities City-Owned Parcels High Opportunity Parks Medium Opportunity Parks Green Street Opportunities High Water Quality Opportunities Water Quality Opportunities Opportunities N Concepts page 106 [cherry creek opportunities] 1 City of Takayama Proposed: Bioretention existing existing proposed 2 Cherry Creek Business District Proposed: Green Street existing existing proposed curb extension 3 Cherry Creek Drive South Proposed: Permeable Pavers public ROW before BMP installation subgrade sand filter pavers in parking area green streets park opportunities 11.51 miles | high priority green street opportunities High Potential Park Opportunities: • Burns Park • Cherry Creek Park 5.62 miles | green street opportunities • City of Karmiel Park • City of Brest Park • City of Takayama Park • Pulaski Park The process to identify site-scale opportunities (Section 4.4) resulted in a network of green street opportunities in each basin. Medium Potential Park Opportunities: Streets projects were considered high priority if potential partner • Hungarian Freedom Park opportunities exist and/or the project would offer significant water quality benefits. While streets represent one of the largest New water quality facilities in parks will be considered if they do not impact sources of urban stormwater pollution, they also represent or limit park use or function. All park related projects will require further one of the best opportunities for the installation of green study, approval by the Department of Parks and Recreation (DPR), and a infrastructure. Practices suitable for use within the right-of-way public involvement process. The designer must work with Denver Parks are illustrated in Denver’s Ultra-Urban Green Infrastructure Planning during all phases to ensure compliance with DPR standards and Guidelines: www.denvergov.org/greeninfrastructure. specifications. The Forestry Office must also be consulted. A [ City of Brest Park ] Image: Aspen, CO The City of Brest project is a proposed semi-regional BMP treating Project Snapshot a moderate upstream area (68-acres) at the southwest corner of Project Location | City of Brest Park Colorado Blvd. and Cherry Creek South Dr. The BMP selected for Site Owner | CCD this location is an EDB and could provide 100% of the water quality Site Land Use | Park/Open Space capture volume (WQCV) for the upstream tributary area, which gives Site Area (AC) | 6.5 it a BMP Opportunity score of 54. The dominate land uses up- Proposed BMP Type | EDB stream include residential and street rights-of-way. In addition to the Total Tributary Area (AC) | 68 water quality benefits supplied by the project, it provides augmented Required WQCV (AC-FT) | 1.4 habitat within an existing park and numerous educational opportuni- Available Storage Volume (AC-FT) | 1.4 ties for park users near Cherry Creek. Additional WQCV Needed Upstream (AC-FT) | None Dry Weather Flow Treatment Possible | Yes Design Considerations Basin Score | 62 Runoff from the tributary area is delivered by existing 36-in and 24-in Sub-basin Score | 21 storm drain pipes, which will outlet into the bottom of the EDB. The BMP Opportunity Score | 54 project proposes to divert the water quality capture event as well as all dry weather flows. Small diversion structures within the existing Water Quality Impacts 36-in storm drain in Colorado Blvd. and 24-in storm drain in Harri- Trib. Area Domin. Land Use ROW/Other son Ln. are required to deliver water quality capture event flows to Trib. Area Composite Imp 62% the BMP which would be approximately 6-ft deep. The park offers Indicator (Totals) Influent Effluent Reduct. enough lateral space so side slopes could be gradual, which would Flow (ac-ft/yr) 7 4 40% soften the overall depth of the facility. A linear bioswale with subdrain TSS (lb/yr) 6 - 10 1.09 - 1.81 40 - 60% could be used along the edges of the basin in lieu of a concrete Phosph (lb/yr) 24 - 34 5 - 7 27 - 25% trickle channel to provide a more integrated design to the park. A Nitrogen (lb/yr) 240 - 330 50 - 70 20 - 30% more detailed site investigation will need to be completed as part Zinc (lb/yr) 5 - 8 0.8 - 2 30 - 50% of a preliminary design report to determine outfall elevations, soil Copper (lb/yr) 1.2 - 2.1 0.2 - 0.4 30 - 60% conditions, and other pertinent BMP design parameters. The upper E.Coli (bill. cfu/yr) 530 - 1050 80 - 330 30 - 38 portions of the EDB should use shallow slopes (less than 10%) to soften the overall depth (6-ft) of the EDB. During moderate storm events (greater than a 2-year event but less than a 10-year event) the EDB could be designed to surface drain Colorado Blvd and/ or Harrison Ln and provide regular detention for the upstream tributary area. The EDB should be constructed with an overflow weir per UDFCD standards, which would function in large storm events if that design option were selected. A proposed 24-in return flow pipe is shown, which returns treated flows back to the existing system near the existing outfall at Cherry Creek South Drive. page 108 Tributary Area TRIBUTARY AREA ROW/Other Residential Commercial Open Space 46.6% 27% 26.2% 0.2% EXISTING PROPOSED Storm Drain Pipe Tributary Area Pond Storm Drain Pipe Existing Treatment Diversion Structure EDB Channel PROJECT DETAIL page 109 B [ Cherry Creek Area Plan ] Source: Cherry Creek Area Plan, 2012 The Cherry Creek Area has changed dramatically over the last decade. At it’s core is a successful mixed-use district surrounded by a collection of residential neighborhoods with their own unique quality and characteristics. The Cherry Creek Area Plan (the Plan) identified key issues and recommendations for Cherry Creek with ‘connected, distinctive, green, and prosperous’ as the established vision. A recommendation within the ‘Connected Cherry Creek’ included a more walkable Cherry Creek. It identified several green infrastructure elements in the Pedestrian Priority Zone (PPZ) and Intersection Toolkit such as curb extensions, landscape planters, and tree trenches that can be used to provide safer, more comfortable connections for pedestrians (and bicyclists) at priority intersections. Pedestrian Priority Zone and Intersections Map Source: Cherry Creek Area Plan, 2012 Pedestrian Priority Zone and Intersection Toolkit This toolkit identifies potential pedestrian enhancement options within the Cherry Creek PPZ.The application of these de- sign options vaires, depending on location and the public or private resources available for construction and maintenance. There is an opportunity for property owners, special districts and the city to work together to consider these enhancements where appropriate. Each option should be weighed against any potential trade-offs including impacts to drainage or on- street parking. Possible elements for consideration include: • Well marked
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