Traditional Technologies Can Be a Drag- Rev Up Your Brownfield By Incorporating Sustainable Landscape and Stormwater Practices Nadia Locke, PE, LEED AP October 2, 2018
Stormwater Challenges at Brownfields • Cannot discharge stormwater into contaminated areas • Dewatering can spread contamination • Engineering controls can increase impervious area • Increases runoff volume • Increases size of stormwater management system
Site Planning Strategies to Avoid Contamination Conflicts • Consultant/Designer Partnership • Maximize placement of impervious site features • Strategically place buildings/parking over contamination • Move or remove contaminated soils • Divert runoff from contaminated area • Consider alternative technologies
Site Planning Strategies to Reduce Stormwater Management Features • Reduce impervious areas • Minimize compaction to increase infiltration and storage • Use draught tolerant vegetation • Redirect stormwater runoff • Re-use
Sustainable Stormwater Management • Permeable Pavement • Underground storage (open trenches, cisterns) • Aboveground storage (tanks, cisterns) • Draught tolerant landscaping • Green Roofs • Rain gardens/Flow-through planters • Bioswales • Injection wells • Regional stormwater management
Permeable Pavement
Underground Modular Storage Rainstorm 3
Undergound Storage- Modular Vault Chamber StormCapture Low impact development exfiltration system that facilitates the infiltration of stormwater into the soil for natural treatment and to replenish local aquifers. 8
Underground Storage- Modular Vault Chambers Designed to minimize the development footprint and reduce project costs. Modular design allows for maximum storage volume and the precast base allows for discharge of stormwater to the soil, reducing stormwater runoff and recharging the groundwater table.
Underground Storage- Arch Chambers Terre Arch Contech ChamberMaxx 10
Rainwater Harvesting Systems-Re-use 11
Drought Tolerant Landscaping, Green Roofs, Living Walls Increase Canopy Cover • Reduce irrigation requirements • Improve evapotranspiration • Increase soil storage capacity • Reduce roof runoff • Improve heat island effect
Rain Gardens/Flow Through Planters • Reduce irrigation requirements • Improve evapotranspiration • Reduce runoff from roof • Provide pretreatment • Provide storage capacity • Improve heat island effect
Drainage Wells • Class V injection wells • Stormwater discharges below contaminated media
Combining Technologies
Regional Approach to Stormwater Management
Beneficial Stormwater Opportunities at Brownfields • Overcome fatal flaws for previously undevelopable sites • May reduce construction costs • Increased area for development • Increased area for open space • Up to four LEED Points • Community Amenities • Sustainable
Funding Sources • Clean Water RLF • Section 319 Grants • EPA Urban Small Waters Grant • TMDL Water Quality Restoration Grants • Helpful links https://floridadep.gov/wra/wra/highlights/water-project-funding-sources https://www.epa.gov/green-infrastructure/green-infrastructure-funding-tools- documents
More Stormwater Challenges at Brownfields Coming our Way
Tides and Groundwater are Linked
Soil Storage Capacity
Stormwater Challenges at Brownfields • Climate change causing rising tides
Rising Tides
Rising Tides
Climate Change-Effects of Rising Tides and Groundwater • Reduced soil storage capacity (vadose zone) • Smear zone is rising • Contaminated groundwater rising • Regulatory agencies establishing new average wet season water levels for design and permitting • Flooding from outfalls backing onto land • Backflow prevention valves • Pumping systems • Raising ground elevations • Again, reduce runoff-be creative!
Thank you! Nadia Locke, PE, LEED AP E Sciences, Incorporated 224 SE 9 th Street Fort Lauderdale, Florida 33316 954-484-8500 nlocke@esciencesinc.com www.esciencesinc.com
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