Infiltration Basins & Permeable Pavement: Examples and Lessons Learned Lene C. Hill, P.E., LEED AP CT Consultants, Inc. June 20, 2013 OhioEPA Storm Water Workshop Cuyahoga Community College Eastern Campus Highland Hills

Cuyahoga Community College Infiltration Basins Advanced Technology Training Center (ATTC) Metro Campus, City of Cleveland Permeable Pavers as Extended Detention Brunswick University Center (BUC) Brunswick, Medina County Projects

Advanced Technology Training Center 50,000 SF Building LEED Gold Architect Braun & Steidl Architects Civil Engineer CT Consultants, Inc. Landscape Architect The Edge Group Project Completion August 2012

PROJECT LOCATION East 30 th Street and Woodland Avenue City 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 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 Control Promote 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 Coefficient C = 0.858i i i P = Precipitation Depth (0.75 inches) A = Contributing Drainage Area (acres) i = impervious area divided by the total area Added 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 Engineer CT Consultants, Inc. Landscape Architect CT Consultants, Inc. Completion Date January 2011

Project Location 3605 Center Road (S.R. 303), City of Brunswick, Medina County High School Library Elementary School Community Center Church Creek

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 = 0.8 Added additional volume equal to 20% of the WQv WQv=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 Information Lene C. Hill, P.E., LEED AP CT Consultants, Inc Sterling Court Mentor, Ohio (440)