Selecting Least Cost Green Infrastructure. James W. Ridgway, PE September 29, 2015
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1 Selecting Least Cost Green Infrastructure James W. Ridgway, PE September 29, 2015
2 Integrated Water Management??
3 IS GREEN INFRASTRUCTURE LESS COSTLY THEN GRAY INFRASTRUCTURE?
4 Cost of Green Infrastructure vs. Gray Infrastructure Storm Water Case Studies 24.50% 44.10% 31.47% Reduced Cost Did Not Influence Costs Increased Costs 479 case studies collect by American Society of Landscape Architects at the request of USEPA -
5 Evaluating Green Infrastructure? Not All green Infrastructure is Created Equally Volume Control Infiltration Is it possible? Reduce peak offsite runoff rates Is it necessary? Divert flows from sewers of course! Define Capture Requirement Define Release Rate Identify Available Area
6 IS VOLUME THE DRIVING FORCE?
7 Incremental Cost per Annual Gallon Captured (Milwaukee Metropolitan Sewerage District, 2013)
8 IS AREA THE DRIVING FORCE?
9 Incremental Cost per Square Foot Managed (Milwaukee Metropolitan Sewerage District, 2013) $2.42 Deep tunnel storage cost Note: The green infrastructure strategies supporting green alleys, streets, and parking lots are included in other strategies. The wetlands Green Infrastructure Strategy is encouraged but not quantified in the plan.
10 Stand-alone Costs (per green infrastructure SF and per SF managed) and the Relationship to Incremental Costs (Milwaukee Metropolitan Sewerage District, 2013) Green Infrastructure Strategy Stand-alone Cost ($/SF) Loading Ratio (Ratio of Area Managed to Area of GI) Stand-alone Cost ($/SF Managed) Incremental GI Cost Compared to Standalone Cost Description of Cost Assumption Green Roofs 1 $ $ % Median PWD cost ($11.50/SF) Rain Gardens $ $ % Middle of FCGS range rounded up to $10/SF Stormwater Trees 2 $ $ % FCGS cost Bioretention/ $ $ % Average between PWD 3 and Bioswale Native Landscaping/Soil Amendments SUSTAIN 4 demonstration project $ $ % Middle of FCGS 5 range, rounded up to nearest $1,000 Porous Pavement $ $ % $10/SF, approximately 90 percent of median PWD costs 44-gallon Rain Barrels 6 $120 (each) N/A $ % Middle of FCGS range rounded up to nearest $10 1,000-gallon Cisterns 7 $5,000 (each) N/A $ % $5/gal., middle of FCGS range for 1,000-gal cistern 1 Incremental cost of green roofs set to 43 percent to match MMSD s $5/SF ($217,800/acre) green roof incentive program. 2 Trees are assumed to have an average 10-ft canopy radius (314 SF), with 50 percent assumed to be overhanging impervious area. 3 PWD is Philadelphia Water Department. 6 Each rain barrel is assumed to manage 350 SF of 4 SUSTAIN is from (MMSD 2011) Determining the rooftop; therefore, barrels are required for 1 Potential of Green Infrastructure to Reduce Overflows acre of roof. in Milwaukee. 7 Each 1,000-gallon cistern is assumed to manage 6,500 5 FCGS is Fresh Coast Green Solutions SF of impervious area; therefore, 6.7 cisterns are (MMSD 2009). required for 1 acre.
11 Costs and Cumulative Volume of Stormwater Removed from the CSO System through Various Gray and Green Strategies (Green in Bold) (Odefey, 2012)
12 WHAT ARE THE POLITICAL DRIVERS?
13 Elected Officials Priorities (a.k.a. The Political Drivers) Clean Drinking Water Don t run out of water No Nitrates in Drinking Water (Blue Baby Syndrome) No Polluting Surface Source Water (Toledo Crisis) No Flooding Keep Sewage out of Recreational Waters General Water Quality Improvement Quality of Life/Economic Development Beyond that details may confuse the subject
14 WHAT ARE THE TECHNICAL DRIVERS?
15 Public Works Priorities (a.k.a. The Technical Drivers) Volume Management No Flooding Reduce Flashy Flows Limit Erosion Pollutant Removal Bacteria Oxygen Demanding Materials Phosphorous/Nitrogen Other Pollutants Green Space Quality of Life
16 WHAT DO ELECTED OFFICIALS AND PUBLIC SERVANTS BOTH WANT?
17 Green Infrastructure is Infrastructure To Protect the Great Lakes We Must Restore the Hydrology We must continues to control/minimize flooding We must remove sources of sewage We need to lower peak flows / raise low flows We want to increase infiltration/ raise groundwater To minimize cost we must combine grey with green infrastructure for optimal performance
18 WATER RESOURCES IMPACT ASSESSMENT TOOL
19 Water Resources Impact Assessment Tool Prioritize the challenges Select Design Drivers Identify Funding Requirements/Opportunities Minimize Cost Maximize Benefit Aggregate Solutions Finance Large Scale Implementation
20
21 GUELPH, ONTARIO (AN EXAMPLE)
22
23 South End Community Park
24 Comparing Volume Captured to Area Required Volume (CF) Stored per 100 SF of BMP BMP Ponding Depth (inches) Planting Material Depth (inches) Stone Base Depth (inches) Volume (CF) Stored per 100 SF of BMP Rain Garden Blue Roof Intensive Green Roof Extensive Green Roof
25 Rainfall = 1 inch South End Community Park Calculating Site-wide Runoff Rainfall = 1 inches Cover Type Soil Type Area (sf) Area (ac) CN (TR-55) S Runoff, Q (in) Runoff Volume, V (ft3) Total Runoff Volume (ft3) Proposed Rec Centre Impervious D 85, , Ex. Building 5, Urban Compact D Ex. Parking & Drives Track & Football Basketball, Tennis & Splash Pad Impervious Walks Baseball Urban Compact Softball #1 Softball #2 Proposed Rec Centre Proposed Parking Impervious D 76, , Urban Compact D 24, Impervious D 40, , Urban Compact D 118, , Impervious D 31, , Urban Compact D Impervious D 23, , Urban Compact D Impervious D Urban Compact D 119, , Impervious D Urban Compact D 119, , Impervious D Urban Compact D 119, , Impervious D 168, , Urban Compact D Impervious D 292, , Urban Compact D 16, , , , , , , , , , ,091.33
26 South End Community Park $8.03
27 South End Community Park Identifying Least Cost BMPs IMPLEMENTATION COSTS - South End Community Park Existing Drives & Parking Location BMP Size Unit Unit Price Construction Cost Annual Maintenance Cost $ $ $ $ $ $ $ $ Lowest Year 1 Cost Bioinfiltration 6,500 SF $ $ 78, , Existing Building Green Roof 85,437 SF $ $ 1,281, , Blue Roof 85,437 SF $ 4.00 $ 341, , $ 58, Cistern CF $ $ 56, , Bioinfiltration 6100 SF $ $ 73, , Existing Drives & Pervious Concrete SF $ 7.00 $ 91, , Parking Pervious Pavers SF $ 9.00 $ 117, $ 39, Underground Storage CF $ 7.00 $ 37, , Track & Football Bioinfiltration 4800 SF $ $ 57, $ 2, $ 60, Basketball, Splash Pad, Bioinfiltration 2400 SF $ $ 28, $ 1, Size Construction $ Cost 30, Tennis Pervious Concrete 5000 SF $ 7.00 $ 35, $ Bioinfiltration 1800 SF $ $ 21, $ Bioinfiltration Walks Pervious Concrete ,100 SF $ 7.00 $ 26, $ $73, $ 22, Pervious Pavers 3800 SF $ 9.00 $ 34, $ Pervious Baseball Concrete Bioinfiltration 1800 SF $ $ 21, $ $ 22, ,000 $91,000 7 Softball #1 Bioinfiltration 1800 SF $ $ 21, $ $ 22, Softball #2 Bioinfiltration 1800 SF $ $ 21, $ $ 22, Pervious Pavers Bioinfiltration ,000 SF $ $ 156, $ $117,000 6, Green Roof SF $ $ 2,524, $ 69, Rec Centre $ 115, Underground Blue Storage Roof SF $ 2.00 $ 336, $ 33, Cistern ,326 CF $ $ 110, $ $37,287 4, Bioinfiltration SF $ $ 276, $ 11, Rec Parking Pervious Concrete SF $ 7.00 $ 350, $ 8, Pervious Pavers SF $ 9.00 $ 450, $ 1, $ 143, Underground Storage CF $ 7.00 $ 136, $ 7, Lowest Cost Total $ 536,367.23
28
29 Stevenson Street
30 Identifying Least Cost BMPs IMPLEMENTATION COSTS - Stevenson Street GI Plan Stevenson N Annual Unit Construction Lowest Year 1 Location BMP Size Unit Feasibility Maintenance Price Cost Cost Cost Bioinfiltration 10,000 SF 1 $ $ 120, $ 3, Pervious Concrete 21,000 SF 1 $ 7.00 $ 147, $ 3, Stevenson N $ 89, Pervious Pavers 21,000 SF 1 $ 9.00 $ 189, $ Underground Storage 8,667 CF 1 $ $ 86, $ 3, Bioinfiltration 1,700 SF 1 $ $ 20, $ Pervious Concrete 3,400 SF Size 1 $ 7.00 $ Construction 23, $ Cost Cassino $ 10, Pervious Pavers 3,400 SF 1 $ 9.00 $ 30, $ Bioinfiltration Underground Storage 1,412 CF 10,0001 $ 7.00 $ 9, $120,000 $ Bioinfiltration 6,300 SF 0.4 $ $ 75, $ 2, Pervious Concrete Pervious Concrete 14,000 SF 21,0001 $ 7.00 $ 98, $147,000 $ 2, William $ 40, Pavers 14,000 SF 1 $ 9.00 $ 126, $ Pervious Underground Storage Pavers 5,472 CF 21,0001 $ 7.00 $ 38, $189,000 $ 2, Bioinfiltration 100 SF 1 $ $ 1, $ Connector Underground $ Storage Storage 80 SF 1 $ 7.00 $ $ ,667 $86,673 Lowest Cost Total $ 141,270.05
31 Sized to Capture 1 of Rain
32 Wayland, MI SF700 SFGarden Rain Garden installed 2012 intercept storm water from roof and drains Various Sites Rain Gardens and bioswales Okemos, MIMI Rain Gardens and bioswales installed inin2010 totointercept storm water parking lots and roads Belleville, 4,600 Rain installed in 2012 to intercept storm water fromfrom roof drain parking lot QUESTIONS?
33 Wayland, MI SF700 SFGarden Rain Garden installed 2012 intercept storm water from roof and drains Various Sites Rain Gardens and bioswales Okemos, MIMI Rain Gardens and bioswales installed inin2010 totointercept storm water parking lots and roads Belleville, 4,600 Rain installed in 2012 to intercept storm water fromfrom roof drain parking lot QUESTIONS?
34 Wayland, MI SF700 SFGarden Rain Garden installed 2012 intercept storm water from roof and drains Various Sites Rain Gardens and bioswales Okemos, MIMI Rain Gardens and bioswales installed inin2010 totointercept storm water parking lots and roads Belleville, 4,600 Rain installed in 2012 to intercept storm water fromfrom roof drain parking lot QUESTIONS?
35 Wayland, MI SF700 SFGarden Rain Garden installed 2012 intercept storm water from roof and drains Various Sites Rain Gardens and bioswales Okemos, MIMI Rain Gardens and bioswales installed inin2010 totointercept storm water parking lots and roads Belleville, 4,600 Rain installed in 2012 to intercept storm water fromfrom roof drain parking lot QUESTIONS?
36 Wayland, MI SF700 SFGarden Rain Garden installed 2012 intercept storm water from roof and drains Various Sites Rain Gardens and bioswales Okemos, MIMI Rain Gardens and bioswales installed inin2010 totointercept storm water parking lots and roads Belleville, 4,600 Rain installed in 2012 to intercept storm water fromfrom roof drain parking lot QUESTIONS?
37 QUESTIONS?
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