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Promoting Low Impact DevelopmentSustainable Stormwater Management

Anthony Kendrick, ENV SP

Director, Green Infrastructure

Design I Protect I Sustain

I

Stormwater

Low Impact Development

• Exceeds Local Water Quality Requirements

• Eases Burden on Support Entities

• Prevents Downstream Erosion

• Mitigates Flash Flooding

• Aesthetically Appealing

• Mimics Nature

• Absorbs Greenhouse Gasses

• Solves Tough Engineering Challenges

But Do Developers Care?

Why Should Developers Care?

The Golden Circle

WHY

HOW

WHAT Deliverables

Beliefs

Vision

HOW

WHAT

“We Sell Great Computers at a Competitive Price"

HOW

WHAT

"In everything we do, we believe in challenging the status quo"

We Must Start With WHY

But Do Developers Care?

Developers Don’t Care About What The Deliverables Are…

But Do Developers Care?

…Not At First

But Do Developers Care?

But Yet That’s All We Talk About

But Do Developers Care?

Developers Don’t Care About How You Do It…

But Do Developers Care?

Developers Primarily Care About WHY They Should Do It…

WHY Low Impact Development

• Increased Lot Yield

• Lower Overall Cost of Development

• Increased Revenue

• No Design Delays / No Construction

Delays

LID WHY

“To Provide Developers With an Ecologically SustainableWater Management Solution That Positively Impacts Their Bottom Line; Through Creativity, Innovation &

Collaboration, Together We Can Build a Future”

Story Telling WHY

Birnamwood Drive – Harris County

WHY LOW IMPACT DEVELOPMENT?

- Reduced Construction Costs- Reduced Maintenance Costs- Safety- Practice What We Preach- Proof of Concept

Birnamwood Drive – Economics

1-Mile Long 4 lane Concrete Boulevard with Median

Traditional (estimated) LID (actual)

Site Prep & Earthwork $391,634.00 $449,060.00

Drainage $400,000.00 $288,432.00

SWPPP $69,600.00 $87,000.00

Landscape Planting $30,000.00 $66,140.00

Landscpe warranty/Maint $0.00 $34,630.00

Bridge $208,517.00 $208,517.00

Subgrade & Paving $1,139,791.00 $1,139,791.00

Traffic $9,000.00 $9,000.00

Signing & Striping $25,461.00 $25,461.00

Traffic Signal $128,010.00 $128,010.00

Utilities $16,140.00 $16,140.00

Extra Work Items $15,650.00 $36,650.00

Biofiltration System $0.00 $132,931.00

SWQ System $30,000.00 $0.00

Detention Basin $350,000.00 $0.00

Total $2,813,803.00 $2,621,762.00

estimated cost benefit: $192,041.00 7% Cost Reduction Per Mile

Easton Commons – New Quest Property

WHY LOW IMPACT DEVELOPMENT?

- Economics- Economics- Economics- Economics- Economics- Economics- Economics

Easton Commons – Economics

WHY LOW IMPACT DEVELOPMENT?

- Economics- Economics- Economics- Economics- Economics- Economics- Economics

Underground Detention:Required Storage – 27,950 CFCost Per CF - $9.50 to $12.00 CF

Cost of System - $280,000

Easton Commons – Economics

Easton Commons – Economics

Queenston Manor Apartments –

Academy Development Corp.

WHY LOW IMPACT DEVELOPMENT?

- Economics- Aesthetics- Maintenance

Queenston Manor Apartments - Economics

• Biofiltration

• Underground storage

•Pervious pavement (parking)

• Bioswales

Queenston Manor Apartments - Economics

Queenston Manor Apartments - Economics

Hard Costs

• 7 Acres @ .35 ACFT/AC = 106,000 CF

Integrated Design Approach

• 43,560 SF Porous Pavers @ $12 SF = $522,720 (-$217,800) = $304,920

• 21,000CF UG Detention / Drainage @ $6 = $126,000 (-$50,000)= $76,000

• 600 SF Biofiltration System @ $100 SF = $60.000

• 50,000 CF @ $.50 CF (Bioswale Excavation & Hauloff) = $25,000

• 2,500 SY Sod @ $1.30SY = $3,250

Total Cost = $469,170

Opportunity Seized – ROI = 10 Months

Queenston Manor Apartments - Economics

Maple Court – Palt, Inc

WHY LOW IMPACT DEVELOPMENT?

- Economics- Aesthetics

Maple Court – Palt, Inc

Maple Court – Palt, Inc

HOW - Beliefs

“We must be disciplined in our core values”

Having a Clear Message in HOW

“Low Impact Development”

“Green Infrastructure”

“Multifunctional Design”

The Future is Multifunctional

• Pavements

• Landscapes

• Drainage

• Rooftops

What’s The Cost Per Square Foot?

What’s The REAL Cost Per Square Foot?

Mimic Predevelopment Hydrology

Would Multifunctional Design…

Time of Flow to Outlet = 3 Minutes Time of Flow to Outlet = 15 Minutes

Slow It Down, Spread It Out, Soak It In

Convey It

Filter It, (Harvest It?) & Let It Go

Resilient Design

Site

Overflow

High Performance

Engineered Filter

LID Elements

Bio-swales: 3 Units

Volume=125,000 CuFt

HPMBS Area = 330 SF

Wetland Pond Storage

Resilient Design

Resilient Design – Tax Day > 16”

Resilient Design– Harvey > 29”

Resilient Design– Harvey > 29”

Resilient Design– Harvey > 29”

HOW - Beliefs

“We must be disciplined in our core values”

WHY LID

HOW

WHAT

What - Deliverables

“We must be consistent in our deliverables”

Delivering on a Promise

• Verify Performance

• Understand Maintenance Requirements

• Be Clear About Maintenance Budget

• Discuss Life-Cycle Costs

• Keep It As Simple As Possible

• Have a Post Construction Plan / Budget

Silt Happens

Silt Happens

Performance Verification

Performance Verification

Performance Verification

Maintenance Requirements

Maintenance Requirements

Maintenance Requirements

Maintenance Requirements

Performance Dictates Maintenance

Planting Dictates Maintenance

Planting Dictates Maintenance

Post Construction Plan

WHY

HOW

WHAT

Delivering on a Promise

• Verify Performance

• Understand Maintenance Requirements

• Be Clear About Maintenance Budget

• Discuss Life-Cycle Costs

• Keep It As Simple As Possible

• Have a Post Construction Plan / Budget

Questions?

Anthony Kendrick, ENV SPDirector, Green Infrastructurewww.ecosvs.com214.701.2117

THANK YOU!