Regenerative Stormwater Regenerative Stormwater Conveyence:Conveyence:

An Integrated Approach to An Integrated Approach to Sustainable Stormwater Planning on Sustainable Stormwater Planning on

Linear ProjectsLinear Projects

2009 IOCET Adapting to Change

Presented by:Joe Berg, PWS, CSEjberg@biohabitats.com

OVERVIEWOVERVIEW• Why change what we’re doing?

• What is Regenerative Stormwater Conveyence?

• How is this better than current practices?

• Opportunities for providing SWM and green infrastructure in linear systems—An Example

Transportation-related Land CoverTransportation-related Land Cover

► StreetsStreets► ParkingParking► DrivewaysDriveways

Make up as much Make up as much as 70% of the as 70% of the

impervious cover impervious cover footprint in most footprint in most

urban watersheds.urban watersheds.

Impacts of ImperviousnessImpacts of Imperviousness

Changes in land and stream corridor use

Changes in geomorphology and hydrology

Changes in stream hydraulics

Changes in function such as habitat, sediment transport and storages

Changes in population composition and distribution, eutrophication and lower water table elevations

Disturbance to a stream corridor system typically results in an increasingly negative spiral of degradation to stream structure and function.

NEGATIVE FEEDBACKNEGATIVE FEEDBACK

Legacy Sediment

Hydric Soil

SO WE TRY TO “FIX” THE PROBLEM

Regenerative

Less Energy Required

More Energy Required

Restorative

Sustainable

Green

Conventional Practice

Relative Improvement (LEED, GB Tool, Green Globe, etc.)

Neutral – “100% less bad” (McDonough)

Humans (Hominids) PARTICIPATING AS nature – Co-evolution of the Whole System

Humans DOING THINGS TO nature – assisting the evolution of Sub-Systems

“One step better than breaking the law” (Croxton)

Technologies / Techniques

Fragmented

Living Systems Understanding

Whole System

Regenerating System

Degenerating System

Trajectory of Environmentally Responsible Design

© All rights reserved. Integrative Design Collaborative and Regenesis 2006 - Contact Bill Reed, reed@integrativedesign.net for permission to use

Regenerative Stormwater Conveyance

Basic Building BlocksBasic Building Blocks

Riffle weir grade control structure

Sandstone boulders

Silica cobble

Create Opportunities to ‘Hold’ Water on the Landscape

Main Channel

The Seepage Feature

Less Intrusive,More Environmentally Sensitive

Benefits of the Regenerative Benefits of the Regenerative Stormwater Conveyence Stormwater Conveyence

ApproachApproachWater Quantity--Increased roughness, extend concentration time, increase water losses along the flow path, velocity and erosion reduction

Water Quality —suspended sediment removal, trapping of particle-bound contaminants, nitrate reduction

Reduced construction and O&M costs

Aesthetic improvements, wetland hydrology support, amphibian and aquatic habitat support, terrestrial wildlife habitat enhancement, suppression of invasive plant species

Holladay ParkHolladay ParkLinear regenerative storm water conveyance alongside the road course

Conversion of a storm water pond to seepage wetland

In-line bioretention areas throughout the landscape

Minimum Sizing Drainage Volume Volume

Criteria Symbol Area Required Provided SWM

Practice Notes

(cubic-

feet) (cubic-

feet) E 1789 9113 RSC

Water Quality F 1089 2575 RSC

water quality volume is

inclusive of recharge volume

Volume (WQv) G 2982 9042 RSC N 1690 7702 RSC

O 503 2600 RSC

Only surface

storage shown as provided volume

Net Difference

[cf] Total 8053 31032 22979

E 519 7434 RSC

Recharge F 316 1877 RSC

recharge volume is included in water quality

volume

Volume (Rev) G 865 7806 RSC N 490 5121 RSC O 146 2435 RSC

The volume provided

is the amount of storage in the

subsurface sand seam

Total 2336 24673

Channel Protection Volume

Total Impervious Area = 1.65 ac or 9% Full Cpv volume is provided in excess storage provided in pools and infiltration zones associated with RSC

(Cpv) 17.9 18295.2 47652 RSC

P has e 1-Orig inal Des ig n C urrent C os ts

P ipe L F G rading/E xcess $248,750.0015" 1453 S WM P ond $80,131.0018" 408 P ipe $23,194.0021" 48 R isers/structures/headwalls $30,000.0024" 517 24" P ipe $8,420.0027" 470 S andstone Weirs $14,360.0030" 52312" x14" 50 Total $404,855.00Total L F 3469

C os tsS WM P ond 216,710.00$ R C P 592,158.75$ S WM Ac c es s R d 8,900.00$ F enc es for S WM P ond 10,700.00$

Total 828,468.75$

L ayout $44,934.00S ediment C ontrols $21,971.00

Holladay P ark- C os t C omparis on

Challenges of Providing SWM in

Transportation Settings

• Code Constraints—consistent with LID practices• Offsite run-on—designed for safe conveyance• Multiple watersheds and out of basin discharges--minimal• Lack of space in ROW—requires less space than status quo• Limited number of “acceptable” practices—uses nature• Utility conflicts—reduced relative to status quo• Other????

Questions?Questions?2009 IOCET Adapting to Change

Presented by:Joe Berg, PWS, CSEjberg@biohabitats.com