LOW IMPACT DEVELOPMENT CONFERENCE LOW IMPACT DEVELOPMENT CONFERENCE NEW CHALLENGE: A CLIMATE FOR CHANGENEW CHALLENGE: A CLIMATE FOR CHANGE

09.28.201009.28.2010

CASE STUDY: WALNUT GROVE, BRAMPTONCASE STUDY: WALNUT GROVE, BRAMPTONA BUILDERA BUILDER’’S PERSPECTIVE OF LOW IMPACT DEVELOPMENTS PERSPECTIVE OF LOW IMPACT DEVELOPMENT

THE SITETHE SITE

CREDIT VALLEY SECONDARY PLAN AREA 45CREDIT VALLEY SECONDARY PLAN AREA 45--66

SITE AREA = 5.6 haSITE AREA = 5.6 ha

EXISTING RESIDENTIAL AND VACANT GREENHOUSEEXISTING RESIDENTIAL AND VACANT GREENHOUSE

BORDERED BY DEVELOPMENT BLOCKSBORDERED BY DEVELOPMENT BLOCKS

MODIFIED BLOCK PLAN PROCESSMODIFIED BLOCK PLAN PROCESS--NO OVERALL ENVIRONMENTAL IMPLEMENTATION NO OVERALL ENVIRONMENTAL IMPLEMENTATION REPORTREPORT

ONLY LANDS CURRENTLY ANTICIPATED FOR DEVELOPMENTONLY LANDS CURRENTLY ANTICIPATED FOR DEVELOPMENT

TRIBUTARY TO CREDIT RIVER AND TRIBUTARY 8b.TRIBUTARY TO CREDIT RIVER AND TRIBUTARY 8b.

NO EXTERNAL DRAINAGE TO SITE NO EXTERNAL DRAINAGE TO SITE --SANDY SOIL LAYERS AND SILTY CLAY TILLSANDY SOIL LAYERS AND SILTY CLAY TILL

GENERAL RECHARGE FUNCTIONGENERAL RECHARGE FUNCTION-- AVERAGE ANNUAL INFILTRATION = 150mmAVERAGE ANNUAL INFILTRATION = 150mm

APPLICABLE APPLICABLE CRITERIACRITERIA

PROPOSED PROPOSED DEVELOPMENTDEVELOPMENT

PROCESSPROCESS

LOW IMPACT LOW IMPACT DEVELOPMENT DEVELOPMENT

SCREENINGSCREENING

RAINWATER HARVESTING RAINWATER HARVESTING

(BARRELS OR CISTERNS)(BARRELS OR CISTERNS)GREEN ROOFSGREEN ROOFS DOWNSPOUT DISCONNECTS / DOWNSPOUT DISCONNECTS /

INCREASED TOPSOILINCREASED TOPSOILSOAKAWAY PITSSOAKAWAY PITS BIORETENTION GARDENS/BIORETENTION GARDENS/

STORMWATER TREE CLUSTERSSTORMWATER TREE CLUSTERS

PERMEABLE PAVEMENTPERMEABLE PAVEMENT VEGETATED FILTER STRIPSVEGETATED FILTER STRIPS SOIL AMENDMENTSSOIL AMENDMENTS DRY SWALESDRY SWALES GRASS SWALESGRASS SWALES

SCREENING VIA SCREENING VIA LID MATRIXLID MATRIXTO IDENTIFY MEASURES APPLICABLE TO SITE CHARACTERISTICSTO IDENTIFY MEASURES APPLICABLE TO SITE CHARACTERISTICS

MODIFIED CROSS SECTIONMODIFIED CROSS SECTION

SELECTED SELECTED MEASURES MEASURES

(PUBLIC + PRIVATE)(PUBLIC + PRIVATE)

EAST HALF OF SITE EAST HALF OF SITE DRAINS TO BIOSWALEDRAINS TO BIOSWALE

WEST HALF OF SITE WEST HALF OF SITE DRAINS TO ROW DRAINS TO ROW INFILTRATION TRENCHINFILTRATION TRENCH

STANDARD RIGHT OF WAY MODIFIED WITH INFILTRATION TRENCHSTANDARD RIGHT OF WAY MODIFIED WITH INFILTRATION TRENCH

THE COSTSTHE COSTS

TRADITIONAL versus TRADITIONAL versus LOW IMPACT DEVELOPMENTLOW IMPACT DEVELOPMENT

THE DEVELOPERSTHE DEVELOPERS’’SSPERSPECTIVEPERSPECTIVE

There is a place at the There is a place at the forefront of home design forefront of home design that other developers strive that other developers strive

to reach. Our goal is to to reach. Our goal is to always be a step ahead of always be a step ahead of the rest of the industry with the rest of the industry with

the newest products, the newest products, cutting edge technology cutting edge technology

and intelligent, practical and intelligent, practical touches touches …… in every home in every home

we build. Because, we we build. Because, we know you're ahead of the know you're ahead of the

curve, and we're right there curve, and we're right there for you.for you.

some of our neighbourhoods some of our neighbourhoods ……

What does LID represent from What does LID represent from a developers perspective?a developers perspective?

effective management of stormwater effective management of stormwater runoff initiatives / directives within our runoff initiatives / directives within our communitiescommunities

having a direct impact on stormwater having a direct impact on stormwater properties and the amount of runoff that properties and the amount of runoff that enters our water systems enters our water systems -- treatmenttreatment

benefits in overall community design benefits in overall community design ––form versus functionform versus function

but LID also represents but LID also represents ……

L I D

logisticalindecisive

device

lengthy important decision

liability inventive debacle

logical inexperienced disaster

leading innovative dollars

WHY LID? WHY LID? MAKING THE MAKING THE DECISION DECISION ……

site story + the evolution of stormwater managementsite story + the evolution of stormwater management

further reduce our impact

changing climate

infrastructure deficit

decentralization

passive versus active

design longevity

design integration

resource conservation

increased costs versus increased revenue: increased costs versus increased revenue: the business casethe business case

COST CONSIDERATIONSCOST CONSIDERATIONS

agency approvalsagency approvals

knowledgeable consultantsknowledgeable consultants

special construction methods for LID special construction methods for LID measuresmeasures

sourcing suitable products/materialssourcing suitable products/materials

experienced contractorsexperienced contractors

operations and maintenance programoperations and maintenance program

monitoring and performance evaluationmonitoring and performance evaluation

replacement/repairsreplacement/repairs

corporate identity corporate identity –– a green a green technology platformtechnology platform

LID sales and marketing strategyLID sales and marketing strategy

Area specific enhancements versus lot premiums

Upgraded features as standards (e.g. permeable driveways)

Additional options and upgrades (e.g. landscape materials, exterior design packages, optional loggias) … generation of revenue

industry responseindustry response

INCENTIVESINCENTIVES

government and government and agency supportagency support

partnership partnership benefitsbenefits

industry supportindustry support

CHALLENGESCHALLENGES

Corporate responsibility and low impact developmentCorporate responsibility and low impact development

Operations and maintenance requirementsOperations and maintenance requirements

Easements and accessibilityEasements and accessibility

Posting of securities and certificationPosting of securities and certification

Attaining final assumption of LID featuresAttaining final assumption of LID features

““ Do as I say, not as I do Do as I say, not as I do …”…”

taking a leap of faith taking a leap of faith …… the unknownsthe unknowns

uncertainty with future responsibility

entering contracts

operations and maintenance of LID initiatives