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Infiltration Basins & Permeable Pavement:Examples and Lessons Learned
Lene C. Hill, P.E., LEED APCT Consultants, Inc.
June 20, 2013
OhioEPA Storm Water WorkshopCuyahoga Community College
Eastern CampusHighland Hills
Cuyahoga Community College
Infiltration BasinsAdvanced Technology Training Center (ATTC)Metro Campus, City of Cleveland
Permeable Pavers as Extended DetentionBrunswick University Center (BUC)Brunswick, Medina County
Projects
Advanced Technology Training Center
50,000 SF Building LEED Gold Architect
Braun & Steidl Architects
Civil EngineerCT Consultants, Inc.
Landscape ArchitectThe Edge Group
Project CompletionAugust 2012
PROJECT LOCATION
East 30th Street and Woodland AvenueCity of Cleveland, Cuyahoga County
Project Location
Site Plan
Site Soil Conditions
Soil Type: Urban Land – Elnora (UeA) Well drained Elnora soil - permeability of this type of soil is
moderately rapid or rapid. Permeability at 32-60 inches depth: 6-20 in/hour(Source: USDA Soil Survey)
Soil Group: B Percolation Tests:
1480 in/hour 172 in/hour 188 in/hour
Storm Water Management Approach
Use of infiltration basins to control storm water Site and building roof drains to the basins Use of infiltration rate of 20 in/hour Outlet control structure controls outflow of
larger storms Water quality volume designed to infiltrate
Storm Water Management Goals
Reduce storm water flow to combined sewer LEED Sustainable Site Storm Water Design
Credits SS Credit 6.1 Quantity Control
Match the pre and post peak discharge and volume for the one- and two-year, 24-hour design storm
SS Credit 6.2 Quality ControlPromote infiltration and treat storm water runoff from 90% of the average annual rainfall (0.75 inches)
Water Quality Volume
WQv = C * P * A / 12
WQv = Water Quality Volume (acre-feet)C = Runoff CoefficientC = 0.858i3 - 0.78i2 + 0.774i + 0.04P = Precipitation Depth (0.75 inches)A = Contributing Drainage Area (acres)
i = impervious area divided by the total areaAdded additional volume = 20% of the WQv
Utility Plan
Total Drainage Area: 2.5 Ac. - 60% impervious Depth of Basins: 1.5’ – 2’
Landscape Plan
Project Completion
Lessons Learned Performance
Storm water infiltration Maintenance
Weeds Erosion Plantings
Brunswick University Center
30,000 SF Building LEED Silver Architects
Robert Maschke Architects, Inc.Richard L. Bowen + Associates, Inc.
Civil EngineerCT Consultants, Inc.
Landscape ArchitectCT Consultants, Inc.
Completion DateJanuary 2011
Project Location
3605 Center Road (S.R. 303), City of Brunswick, Medina County
High School
LibraryElementary
School
Community Center
Church
Cre
ek
Site Plan
Site Area: 1 Ac.Parking Lot Area: 0.33 Ac.
Site Constraints
Location of Project Between existing buildings and parking
Location of Proposed Storm Water BMPs Minimal room for above ground detention and other bmps
Possible Storm Sewer Tie-ins Non-existent or shallow
Soil Type Sebring – Soil Group D Mahoning – Soil Group D
Storm Water Management Approach
Underground Storage
Pipe Storage Depth limitations
Permeable Pavers Small parking lot area Use base as storage facility LEED Credit SS 7.1 for Heat Island Effect Non-Roof
by using pavers with Solar Reflective Index > 29
Permeable Pavers as Extended Detention
Stone Base Used Porosity of 0.33
Sized to Accommodate 100 Year Storm Event Sized to Accommodate Water Quality Volume Drains to Outlet Control Structure WQv drawdown time: 48 hours
Water Quality Volume
WQv = C * P * A / 12
C = 0.8Added additional volume equal to 20% of the WQvWQv=Voids Volume
Volume in base for WQv = Solids Volume + Voids Volume
Outlet Structure
Permeable Paver Section
Depth of Section: 2.5’-3’
Project Completion
Pavement Comparison
Lessons Learned Performance
Storm water infiltration Pavers
Maintenance Maintenance Schedule and Submittals Cigarette butts Salt
Questions?
Contact InformationLene C. Hill, P.E., LEED AP
CT Consultants, Inc.8150 Sterling CourtMentor, Ohio 44060
(440) 951-9000lhill@ctconsultants.com
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