Infiltration Basins Permeable Pavement Examples and Lessons Learned

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

Projects o 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

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

Project Location PROJECT LOCATION East 30 th Street and Woodland Avenue City of Cleveland, Cuyahoga County

Site Plan

Site Soil Conditions o Soil Type: Urban Land – Elnora (Ue. A) 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) § o o Soil Group: B Percolation Tests: § § § 1480 in/hour 172 in/hour 188 in/hour

Storm Water Management Approach o o o 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 o o 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

Water Quality Volume WQv = C * P * A / 12 WQv = Water Quality Volume (acrefeet) C = Runoff Coefficient C = 0. 858 i 3 - 0. 78 i 2 + 0. 774 i + 0. 04 P = Precipitation Depth (0. 75 inches) A = Contributing Drainage Area (acres) i = impervious area divided by the total area

Utility Plan Total Drainage Area: 2. 5 Ac. - 60% impervious Depth of Basins: 1. 5’ – 2’

Landscape Plan

Project Completion

Lessons Learned o Performance § o Storm water infiltration Maintenance § § § Weeds Erosion Plantings

Brunswick University Center o o o 30, 000 SF Building LEED Silver Architects Robert Maschke Architects, Inc. Richard L. Bowen + Associates, Inc. o Civil Engineer CT Consultants, Inc. o Landscape Architect CT Consultants, Inc. o Completion Date January 2011

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

Site Plan Site Area: 1 Ac. Parking Lot Area: 0. 33 Ac.

Site Constraints o Location of Project § o Location of Proposed Storm Water BMPs § o Minimal room for above ground detention and other bmps Possible Storm Sewer Tie-ins § o Between existing buildings and parking Non-existent or shallow Soil Type § § Sebring – Soil Group D Mahoning – Soil Group D

Storm Water Management Approach Underground Storage o Pipe Storage § o 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 o Stone Base § o o 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=Voids 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 o Performance § § o 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. 8150 Sterling Court Mentor, Ohio 44060 (440) 951 -9000 lhill@ctconsultants. com