VUSP 2015 10/13/2015

NTM Engineering and LRSLA Studio 1

Hydrologic & Hydraulic Studies ● Waterway Permitting ● Stormwater Design & Permitting ● Technical Course Development & Training ● GIS ● Transportation and Bridge Engineering Services ● Bridge Design & Inspection

www.ntmeng.com

Stormwater SMP MaintenanceIt Takes A Team

Design - Construct - Inspect - Operate - Maintain

The Team

Contractor Engineer

Conservation District

PaDEP

Township

Developer

EPA

SaLD

O

OwnerHOAHouse

Builder

NPDES     Clean Water Act

§ 102.8. PCSM requirements.

Licensed professional oversight of critical stages. A licensed professional or a designee shall be present onsite and be responsible during critical stages of implementation of the approved PCSM Plan.

‘‘I (name) do hereby certify pursuant to the penaltiesof 18 Pa.C.S.A. § 4904 to the best of my knowledge,information and belief, that the accompanying recorddrawings accurately reflect the as‐built conditions, aretrue and correct, and are in conformance withChapter 102 of the rules and regulations of theDepartment of Environmental Protection and that theproject site was constructed in accordance with theapproved PCSM Plan, all approved plan changes andaccepted construction practices.’’

2000-2004

Get It Out of the Ponds

50 YEARS OF CONSTANT CHANGE

1983-2000

Get It Into a Pond

2004-Now Infiltrate (Earlier in MD)

50 YEARS OF CONSTANT CHANGE50 YEARS OF CONSTANT CHANGE

NOW: Green Stormwater Infrastructure

VUSP 2015 10/13/2015

NTM Engineering and LRSLA Studio 2

1980s Chesapeake Corporate Center Typical 1980s Outlet Structure

Typical 30-year-old CMP Piping Failure Through Dams

No Anti-seep Collar Outlet Structures

VUSP 2015 10/13/2015

NTM Engineering and LRSLA Studio 3

Outlet Structures

Pond Needs Aeration – Circa 1990s Circa 1996 Stonefield, Townsend, DE

Circa 1998, Riverwalk, DE Riverwalk in 2011

VUSP 2015 10/13/2015

NTM Engineering and LRSLA Studio 4

Circa 2000, CCSC-2, Delaware CCSC-2 in 2011

Wetland Basin in Need of Cleanout

2002 Presidential Estates

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NTM Engineering and LRSLA Studio 5

Excavator Dimensions Typical Bioretention Problems

Circa 2007

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NTM Engineering and LRSLA Studio 6

Typical BioretentionProblems

From Chesapeake Bay Foundation

Typical Bioretention Problems

From Chesapeake Bay Foundation

Circa 2002 Tim’s Liquors, DE2011 Site Visit

Typical Bioretention Problems

From Chesapeake Bay Foundation

Failed Underdrain

VUSP 2015 10/13/2015

NTM Engineering and LRSLA Studio 7

Bioswales

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NTM Engineering and LRSLA Studio 8

Imants Spatenmaschine 

Infiltration Basin Case StudyInfiltration Basin Case Study

Courtesy Montgomery County Conservation District

1’ over‐excavation would not have been enough

1’ over‐excavation would not have been enoughInfiltration Basins

VUSP 2015 10/13/2015

NTM Engineering and LRSLA Studio 9

VUSP 2015 10/13/2015

NTM Engineering and LRSLA Studio 10

Manufactured Devices

Green Stormwater Infrastructure

Julie Hendrickson, R.L.A.

VUSP 2015 10/13/2015

NTM Engineering and LRSLA Studio 11

Plant massings

Limited palette, 60/40 Bold sweeps

Paths, shrub borders, benches Architectural elements

VUSP 2015 10/13/2015

NTM Engineering and LRSLA Studio 12

Thegardenwanderblogspot.comRhythm / repetition

www.udel.edu

Mown paths

Lurid SedgeCarex lurida

Nickrent.www.phytoimages.siu.edu

Short‐toothed Mountain MintPycnanthemum muticum

www.bbc.org

Blue Flag IrisIris versicolor

Chris Neufeld 2004

Shenandoah SwitchgrassPanicum virgatum ‘Shenandoah’

VUSP 2015 10/13/2015

NTM Engineering and LRSLA Studio 13

SwitchgrassPanicum virgatum

Purple ConeflowerEchinacea purpurea

www.mgnliners.com

Black‐eyed SusanRudbeckia fulgida

‘Purple Dome’ New England AsterSymphyotrichum novae‐angliae ‘Purple Dome’ www.brightsideltd.org

‘Fireworks Goldenrod’Solidago rugosa ‘Fireworks’

Hydrologic & Hydraulic Studies ● Waterway Permitting ● Stormwater Design & Permitting ● Technical Course Development & Training ● GIS ●

Transportation and Bridge Engineering Services ● Bridge Design & Inspection

www.ntmeng.com

Julie Hendrickson, R.L.A.

Mark Derham Bowen P.E., CFM

Thank You

LRSLAstudio