Sustainable Development: Practical Solutions to Real World Problems

Fishkill, NY

November 7, 2012

Low Impact Development and Rainwater Harvesting Solutions for

the Urban Environment

Derek BergRegulatory Manager

CONTECH Engineered Solutions

What is Low Impact Development?

Photo: Seattle SEA Streets Project

• Design philosophy for managing stormwater

• Mimic predevelopment hydrology (modeled after nature)

• Reduce, infiltrate, re-use, evaporate, filter, detain runoff close to its source

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

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)

5 Step Design/Planning Process:

LID Regulatory Hierarchy

Surface Infiltration: ChamberMaxx

Surface Infiltration: Grass Paver

Sub-Surface Infiltration

Retention

• Maintain predevelopment

hydrology

• Preserve Land Area

• Pretreatment Recommended

Detention

• Traditional Design Practice

• Conditions not suitable for

infiltration

• Reduce Runoff Rate

Metal

Plastic

Concrete

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

Conservation Focus Stormwater Focus

Primary Goal Reduced municipal demand Eliminate runoff (pollution prevention)

Secondary Benefits

Reduce SW Runoff, Energy, CO2

Conservation, Energy, CO2

Catchment Area Maximize, to Increase SupplyMinimize, to Reduce

Supply

Water Usage Minimize and Conserve Find Reuse Applications

Seasonal Challenge

Dry Season – not enough rainWet Season – too much

rain

Cistern Goal Keep it full Empty it quickly

Economic ROINegative – “external costs” not

included in market price of water

Positive – best LID solution in many cases

11

Rainwater Harvesting – Two Perspectives

Rainwater Harvesting

UrbanGreen™ BioFilter

• Innovative tree box filter design

• Incorporates bioretention & media filtration

• Combines biological, chemical & physical treatment processes

Operation – Increasing Flow

UrbanGreen BioFilter

3

4

• Two stage treatment:– 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

PhosphoSorb™ PerliteCSF®

Leaf MediaZPG

Sediments ■ ■ ■ ■

Oil and Grease ■ ■ ■ ■

Soluble Metals ■ ■ ■

Organics ■ ■

Nutrients ■ ■ ■ ■

Total Phosphorus ■

StormFilter Media

Filtration and Infiltration

Treatment and Detention

Volume Storage Treatment Chain

UrbanGreen Building Blocks

VortSentry®

VortSentry® HS

Hydrodynamic Separation

• Stand Alone Treatment

– Redevelopment

– Retrofit

• LID Pretreatment IMP

– Surface Infiltration

– Subsurface Infiltration

– Rainwater Harvesting

Questions???

Derek Berg

E: dberg@conteches.com

Ph: 207-885-9830