Transcript Adam Sapp - IECA Northeast Chapter

Low Impact Development and
Rainwater Harvesting Solutions for
the Urban Environment
Sustainable Development: Practical Solutions to Real World
Problems
Fishkill, NY
November 7, 2012
Derek Berg
Regulatory Manager
CONTECH Engineered Solutions
What is Low Impact Development?
• Design philosophy for managing
stormwater
• Mimic predevelopment
hydrology (modeled after nature)
• Reduce, infiltrate, re-use,
evaporate, filter, detain runoff
close to its source
Photo: Seattle SEA Streets Project
5 Principles of LID
1. Conserve natural areas
2. Minimize development impact on hydrology
3. Maintain runoff rate and duration from the site
4. Use integrated stormwater management practices
5. Implement pollution prevention, proper
maintenance and public education programs
Updated NYS Stormwater Standards
5 Step Design/Planning Process:
1. Site planning to preserve natural features and reduce
impervious cover
2. Calculate of the water quality volume
3. Incorporate green infrastructure and standard SMPs with
Runoff Reduction Volume (RRv) capacity (Infiltration,
rainwater harvesting, porous pavers)
4. Use standard SMPs, where applicable, to treat the water
quality volume not addressed by green infrastructure
techniques and standard SMPs with RRv capacity
(biofiltration, filtration)
5. Design volume and peak rate control practices where
required. (Detention)
LID Regulatory Hierarchy
Surface Infiltration: ChamberMaxx
Surface Infiltration: Grass Paver
Sub-Surface Infiltration
Retention
• Maintain predevelopment
Metal
hydrology
• Preserve Land Area
• Pretreatment Recommended
Plastic
Detention
• Traditional Design Practice
• Conditions not suitable for
Concrete
infiltration
• Reduce Runoff Rate
Subsurface Infiltration: CDS and Perf Pipe
Turnkey Rainwater Harvesting Solutions
Rainwater Harvesting
• Above ground storage
• Below ground storage
– Metal
– Steel Reinforced Polyethylene
– Concrete
• Pump, Treatment, Control Systems
• Complete Systems
Rainwater Harvesting – Two Perspectives
Conservation Focus
Stormwater Focus
Eliminate runoff
Primary Goal
Reduced municipal demand
Secondary
Benefits
Reduce SW Runoff, Energy,
CO2
Conservation, Energy,
CO2
Catchment Area
Maximize, to Increase Supply
Minimize, to Reduce
Supply
Minimize and Conserve
Find Reuse Applications
Dry Season – not enough rain
Wet Season – too much
rain
Keep it full
Empty it quickly
Negative – “external costs” not
included in market price of
water
Positive – best LID
solution in many cases
Water Usage
Seasonal
Challenge
Cistern Goal
Economic ROI
(pollution prevention)
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Rainwater Harvesting
UrbanGreen™ BioFilter
• Innovative tree box
filter design
• Incorporates
bioretention & media
filtration
• Combines biological,
chemical & physical
treatment processes
UrbanGreen BioFilter
Operation – Increasing Flow
• Two stage treatment:
3
4
– Low flows treated by
biofiltration
– Higher flows treated by
cartridge based media
filtration
• Two 27” StormFilter
cartridges
• Cartridges treat
22.5 GPM each
McNichols Office Bldg. – Roanoke, VA
Sub-Surface Filtration: StormFilter
StormFilter Vault
StormFilter Media
PhosphoSorb™
Perlite
CSF®
Leaf Media
Sediments
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Oil and Grease
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Soluble Metals
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Organics
Nutrients
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Total Phosphorus
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ZPG
Filtration and Infiltration
Treatment and Detention
Volume Storage Treatment Chain
UrbanGreen Building Blocks
Hydrodynamic
Separation
• Stand Alone Treatment
– Redevelopment
– Retrofit
• LID Pretreatment IMP
VortSentry® HS
– Surface Infiltration
– Subsurface Infiltration
– Rainwater Harvesting
VortSentry®
Questions???
Derek Berg
E: [email protected]
Ph: 207-885-9830