LID Cost Considerations “ALL Technologies” Project Life Cycle Planning Design Construction Operation Maintenance Recapitalization Decommission

Conventional 244 Lots Cantura Coves: Mesquite, Texas D.R. Horton 241 Coved Lots Cantura Coves: Mesquite, Texas D.R. Horton 241 Coved Lots Coving: 42% Less Street 40% Larger Lots Meandering Walks

3.7 Per Ac Photo: Cantura Cove – Mesquite, Texas

Placitas de La Paz: Coachella, California Canaday & Company 271 Coved Lots Coving: 42% Less Street Same Avg. Lot Size. Connective Walks 31 MORE Lots! Conventional Coved

Construction Cost Comparison

Green - LID Yellow - Conventional

This development was also cited in a report from the NAHB Research Center, published in July 2001, called Environmentally Green…Economically Green, Tools for a Green Land Development Program. The report provides a wealth of information and sources on Low-Impact and Sustainable Development practices. A Comparison of Two Different Land Plans PROJECTED RESULTS FROM TOTAL DEVELOPMENT Total Site Lot Yield Linear Feet - Street Linear Feet - Collector Street Linear Feet - Drainage Pipe Drainage Sections (Inlets, Boxes, Headwalls) Estimated Total Cost Conventional Plan ,770 7,360 10, $4.6 million Revised Green Plan , , $3.9 million ACTUAL RESULTS FROM PHASE ONE Total Site (engineer’s estimate) Lot Yield Total Cost Cost Per Lot Conventional Plan 63 $1,028,544 $16,326 Green Plan ,523 $11,507 ECONOMIC AND OTHER BENEFITS FROM LOW-IMPACT DEVELOPMENT Higher Lot Yield Higher Lot Value Lower Cost per Lot Enhanced Marketability Added Amenities Recognition 17 additional lots $3,000 more per lot than competition $4,800 less per lot 80 percent of lots sold in the first year 23.5 acres of green space/parks National, state, and professional groups TOTAL ECONOMIC BENEFITMore than $2.2 million in savings.

No Cost Stuff 1.Site Design to Conserve Terrestrial Functions 2.Disconnection 3.Grading Techniques 4.Distributed Controls 5.Multifunctional Use of Space 6.Less Grading and Clearing “Optimize the use of these smart design techniques”

Rain Garden Treatment Train Approach Bioretention Cell Storm Drain System Bioretention Cell Flow Path Grass Swale Grass Filter Strip

Rain Gardens

Conventional Development

Stormwater Pond Problems High Design / Construction Costs Moderate Maintenance –Functional / Aesthetics Consumes Land / Resources Limited Effectiveness Disease Public Safety

LID Development Conservation Minimization Soil Management Open Drainage Rain Gardens Rain Barrels Pollution Prevention Disconnected Decentralized Distributed Multi-functional Multiple Systems

No Cost Stuff 1.Site Design to Conserve Terrestrial Functions 2.Disconnection 3.Grading Techniques 4.Distributed Controls 5.Multifunctional Use of Space 6.Less Grading and Clearing “Optimize the use of these smart design techniques”

Construction Cost Comparison

Rain Garden Treatment Train Approach Bioretention Cell Storm Drain System Bioretention Cell Flow Path Grass Swale Grass Filter Strip

Rain Gardens

Somerset Cost Savings $780,000 Total Cost Savings –Eliminated Curb / Gutter $350,000 4 stormwater ponds $650,000 Pipes / Structures $150,000 –Added $370,000 for Rain Gardens

Bioretention Shallow Ponding - 4” to 6” Soil Depth 2’ - 2.5’ Sandy Top Soil 50% Sand 20% Sandy Loam 30% Compost Under Drain System Plant Selection Aesthetic Value / Habitat Value Property Value / Low Cost Low Maintenance X 2’ Under Drain

Proprietary Devices

Rain Garden on a commercial project with turf grass near I-395 and Edsall Road.

Rain Garden longitudinal view showing overflow device.

High Flow Rate Filter and Infiltration Treats 90% of Total Annual Volume

Maintenance Cost - $200 / Year

Perspectives on Implementing Low-Impact Developments since 1998 Waukesha, Wisconsin

Use native species in restoring open spaces and in lot bioretetnion landscaping

© Applied Ecological Services, Inc.

Home and Lot Sales Conventional $40,000 Village of Jackson Lot Size: 7,000 – 8,000 ft 2 Price: low-mid $40,000 Low Impact $50,000 Prairie Meadows Lot Size: 7,000 – 8,000 ft 2 Price: mid-high $50,000

Advantages of LID Over Conventional Design Added Value of LID Results in: Lot Premiums Lot Premiums Increased Sales Velocity Increased Sales Velocity Increased Sales Volume Increased Sales Volume Reduced Debt Service Reduced Debt Service Reduced Infrastructure Costs Reduced Infrastructure Costs

Lessons Learned Nature Sells!

Biggest Obstacles to LID Local Ordinances and Knowledge / Experience of Local Building Officials & Consultants! Biggest Obstacles to LID Local Ordinances and Knowledge / Experience of Local Building Officials & Consultants!