Permeable Pavement Systems. BMP Impacts on Cost. Green vs Gray Economic Factors. Permeable Pavement Economic Considerations & Case Studies

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1 EGRA Stone Permeable Pavement Systems Permeable Pavement Economic Considerations & Case Studies Economic Considerations Public Facility Parking Lots Main Street Streetscape Residential Streets ECO Stone Green vs Gray Economic Factors Construction Cost Site Utilization Marketing/Aesthetics Maintenance/Longevity BMP BMP Impacts on Cost Construction Cost Site Utilization Marketing/ Aesthetics Maintenance/ Longevity Green Roof Permeable Pavers 0/ Bioretention +/ Native Landscapes Natural Drainage Positive Impact, - Negative Impact 1

2 Fox River Water Reclamation District Fox River Water Reclamation District Bioretention Permeable paving Infiltration Trench FRWRD Cost Comparison Gray Infrastructure Asphalt Paving Storm sewer Detention Wetland permitting $153,000 Green Infrastructure Permeable paving Bioretention $140,000 2

3 Carol Stream Park District: LEED Silver Recreation Center Site Objectives Site Plan LEED Sustainable Sites Highest Environmental Performance Reduced Irrigation Increased Longevity Cost Effective 3

4 Integrated Stormwater & Landscape Design Construction 4

5 Life Cycle Cost Analysis West Union Iowa s Green Street Pilot Project Green Pilot Streetscape Project A Sustainable Vision for West Union The City of West Union Main Street West Union Iowa Department of Economic Development 5

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8 Charles City, Iowa 8

9 Oelwein, Iowa CONSERVATION Portland, Oregon DESIGN FORUM 9

10 Stormwater Materials Street Permeable Paver: Eco Optilock Sidewalk Permeable Paver: Eco Prioria Bioretention Areas Street Section 10

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12 Summary of Results Pre-Project Post-Project % Reduction Threshold Event 0.05" 1" - 2-Year Event (2.91" rain) Runoff Volume (inches) % Peak Flow (cfs) % 10-Year Event (4.31" rain) Runoff Volume (inches) % Peak Flow (cfs) % 100-Year Event (6.36" rain) Runoff Volume (inches) % Peak Flow (cfs) % 12

13 Charles City Permeable Streets Charles City Permeable Streets 13

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16 Jordan Cove Waterford, Connecticut 16

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19 TABLE 2: PROTOTYPE MODEL RESULTS Rainfall* Existing Proposed % Reduction 6-Month Event Runoff volume (inches)* % Runoff Rate (cfs)** % 1-Year Event Runoff volume (inches)* % Runoff Rate (cfs)** % 2-Year Event Runoff volume (inches)* % Runoff Rate (cfs)** % 10-Year Event Runoff volume (inches)* % Runoff Rate (cfs)** % 100-Year Event Runoff volume (inches)* % Runoff Rate (cfs)** % * Based on 24-hour rainfall ** Based on critical duration storm Project Costs Remove & replace existing pavement & curbs 17 City Blocks 112,000 square feet Excavation Gravel Base Permeable Paving Water main & services Sanitary sewer services $3.7M construction cost $3.9M construction, engineering, fees 19

20 Carbon Cliff Permeable Streets Questions? 20

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22 2-Year Event STATE STREET 1 st STREET Pond Elevation CFS 17.1 CFS 2.9 CFS 13.0 CFS Permeable Paving Flows Storm Sewer Flows 0.97 CFS 11.1 CFS 0.31 CFS 5.4 CFS 2 nd STREET 3 rd STREET 0.64 CFS 7.4 CFS 4 th STREET 5 th STREET 6 th STREET 22

23 10-Year Event Pond Elevation CFS 45.3 CFS Permeable Paving Flows Storm Sewer Flows 100-Year Event POND ELEVATION CFS CFS Permeable Paving Flows Storm Sewer Flows STATE STREET 13.2 CFS 31.7 CFS STATE STREET 40.2 CFS 79.3 CFS 1 st STREET 6.1 CFS 26.6 CFS 1 st STREET 21.6 CFS 64.4 CFS 2 nd STREET 2 nd STREET 2.3 CFS 12.9 CFS 3 rd STREET 3.9 CFS 17.6 CFS 3.1 CFS 9.3 CFS 3 rd STREET 13.4 CFS 42.3 CFS 4 th STREET 4 th STREET 5 th STREET 5 th STREET 6 th STREET 6 th STREET Street View Character Proposed Alternate 1-48/50/60/66 Right-of-Way Streets Street View Character - 48/50/60/66 Right-of-Way Streets Proposed Alternate 2: perennial edge 23

24 Street View Character - 48/50/60/66 Right-of-Way Streets Proposed Alternate 2: turf edge Phase 1 Complete Phase 2 Complete Phase 3 Pending 24

25 Summary of Results Carbon Cliff Green Streets Phase 2 (10.4 acres) Pre-Project Post-Project % Reduction Threshold Event 0.05" 1.10" - 2-Year Event (2.91" rain) Runoff Volume (inches) % Peak Flow (cfs) % 10-Year Event (4.31" rain) Runoff Volume (inches) % Peak Flow (cfs) % 100-Year Event (6.36" rain) Runoff Volume (inches) % Peak Flow (cfs) % 25

26 Questions? 26