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The Green and In-Between: Incorporating Green Infrastructure in Municipal Design

Tricia Hatley, P.E. – Freese and NicholsBoris Minot, EIT, CFM – Freese and Nichols

Development of LID Standard Details for the City of Dallas

LID Design Components

MAXIMIZE THE

QUALITYOF RUNOFF

CLEANERWATER

LESS FLOODING

MINIMIZE THE

QUANTITYOF RUNOFF

LID DRAINAGE CONCEPT

1. Quantity ControlPeak Flow AttenuationRunoff Volume Reduction

2. Quality ControlSedimentationFlotatationFiltrationBiological Processes

3. Pollutant RemovalTSSNutrientsBacteria 2

Additional Benefits of LID

• Case Studies Analyzing the Economic Benefits of Low Impact Development and Green Infrastructure Programs (EPA, 2013)

• Reducing Stormwater Costs through Low Impact Development Strategies and Practices (EPA, 2007)

Reduced Construction Costs

• A 2008 study in Seattle found neighborhoods with LID practices increased property values by 3.5-5% (The Effect of LOD on Property Values, Water Environment Federation)

Increased Property Values

3

Challenges

High Intensity Rainfall

Dual Function

Performance

Poor SoilsLack of

Available Space

Poor Design Practices

Poor Construction

Practices

Poor O&M Practices

Vegetation Failure

BMP Failure

4

Keys to Success

Constructible

Durable

Maintainable

Compatible

Visible

Context Sensitive

5

• Adoption and inclusion of LID Standard Details into design standards

• Updated Drainage and Paving Manuals

• LID Training and Maintenance Presentations for City staff

• LID becomes the accepted and preferred design approach

City of Dallas - Goals

6

Creating Standard Details

7

Objectives

Input from stakeholders

Determine appropriateness for Dallas

Research LID Programs Nationwide

8

Curb Extension-Corner -Mid-block

Tree Box Filter-Single-In Series

Enhanced/Vegetated Swale

Bioretention Planter-With Parking-Without Parking

Bioswale

Bioretention Planter-With Parking-Without Parking

Curb Extension-Corner -Mid-block

BioswaleEnhanced/Vegetated SwaleTree Box Filter

-Single-In Series

9

Bioretention Planters

City of Philadelphia Green Streets Design Manual10

Bioretention Planters

California Department of Transportation 11

Bioretention Planters

12

Curb Extensions

City of Philadelphia Green Streets Design Manual 13

Curb Extensions

Portland Green Streets 14

Curb Extensions

15

Bioswales

New York City Urban Design Manual16

Bioswales

A Green Footprint LLC 17

Bioswales

18

Enhanced/Vegetated Swale

City of Philadelphia Green Streets Design Manual, 2014 19

Enhanced/Vegetated Swale

20

Enhanced/Vegetated Swale

21

Tree Box Filter

City of Philadelphia Green Streets Design Manual, 2014 22

Tree Box Filter

Grande Dunes Marina, Contech Engineered Solutions

23

Tree Box Filter - Single

24

Tree Box Filter - Series

25

LID General Notes

26

Design ComponentsTrench Drain Plants & Shrubs

Cleanout Overflow Structure

Edge Treatments

Energy DissipatorsUnderdrain

Storage Media

27

Landscaping Planting Media

Crepe Myrtle

American Beautyberry

Cardinal Flower

Eastern Redbud

False Indigo

Joe Pye Weed 28

Public Signage

Lidsigns.com Bagby Street, Houston, TX

Educate the pubic about LID goals, functions and importance

Identifies lid facility for maintenance crews

29

Maintenance and Inspections

30

Maintenance and Inspections

31

Maintenance Protocol

32

Training for City of Dallas Staff

1st Session: September 2016• Introduction of LID and the details

2nd Session: August 2017• Maintenance

33

Questions?

• Tricia Hatley, P.E. – Freese and Nichols –thh@freese.com• Boris Minot, EIT, CFM – Freese and Nichols – boris.minot@freese.com