RAINWATER SYSTEMS & VEGETATED ROOFS
Statewide LID Training Program
INTERMEDIATE TOPICS IN LID DESIGN
INSTRUCTORS
JASON KING, RLA
ASLA LEED AP
Senior Landscape Architect
Key project experience:
Stormwater design for
development, site design,
green roofs, stormwater art,
ecological planning
CHRIS WEBB, PE
LEED FELLOW
Associate Engineer
Key project experience: permeable pavement,
bioretention, rainwater harvesting
AGENDA
introduction
rainwater collection systems
vegetated roofs
wrap up
RAINWATER SYSTEMS & VEGETATED ROOFS
Statewide LID Training Program
INTERMEDIATE TOPICS IN LID DESIGN
LEARNING OBJECTIVES
1. Gain an intermediate level knowledge
necessary for proper entry level design
and implementation of permeable
pavement systems in residential and
commercial settings (new and retrofit).
2. Learn skills necessary for basic site
assessment and locating permeable
pavement areas in residential and
commercial settings.
3. Learn practical skills necessary for
preparing construction for basic
permeable pavement systems.
PROGRAM OVERVIEW
• 2012: Public and private
partners engage state
legislature to fund program.
• June 2012: LID Training
Steering Committee convened.
• 2012‐2013: Washington State
LID Training Plan developed:
www.wastormwatercenter.org/
lid‐background
• 2014: Training program built
from state LID Training Plan.
PROGRAM OVERVIEW
• 49 trainings in western and
eastern WA in 2014‐2015.
• 42 trainings in western and
eastern WA in 2015‐2016.
• 39 trainings offered in
western and eastern WA in
2017.
• Three levels: Introductory,
Intermediate, and Advanced.
• Statewide LID Certificate now
available.
PROJECT LEAD
ADDITIONAL TRAINING SUPPORT
OVERVIEW OF PROGRAM
CORE TEAM
Introduction to LID
for Inspection &
Maintenance Staff
INTRODUCTORY
INTERMEDIATE
ADVANCED
Intermediate LID
Design: Rainwater
Collection Systems &
Vegetated Roofs
Intermediate LID
Topics: NPDES Phase
I & II Requirements
Intermediate
LID Design:
Permeable Pavement
Intermediate
LID Design:
Hydrologic Modeling
Advanced Topics in
LID Design:
Bioretention
Advanced Topics in
LID Design:
Permeable Pavement
Advanced Topics in
LID Design:
Hydrologic Modeling
Advanced Topics in
LID Design: Site
Assessment,
Planning & Layout
Advanced Topics in
LID Design: Rainwater
Collection Systems &
Vegetated Roofs
Advanced Topics in LID
Design: Bioretention
Media and Compost
Amended Soils
OVERVIEW OF PROGRAM
Advanced Topics for
Long‐term LID
Operations:
Bioretention
Intermediate
LID Design:
Bioretention
Advanced Topics for
Long‐term LID
Operations:
Permeable Pavement
Intermediate LID
Design: Site
Assessment, Planning
& Layout
Introduction to LID
for Inspection &
Maintenance Staff
INTRODUCTORY
INTERMEDIATE
ADVANCED
Intermediate LID
Design: Rainwater
Collection Systems &
Vegetated Roofs
Intermediate LID
Topics: NPDES Phase
I & II Requirements
Intermediate
LID Design:
Permeable Pavement
Intermediate
LID Design:
Hydrologic Modeling
Advanced Topics in
LID Design:
Bioretention
Advanced Topics in
LID Design:
Permeable Pavement
Advanced Topics in
LID Design:
Hydrologic Modeling
Advanced Topics in
LID Design: Site
Assessment,
Planning & Layout
Advanced Topics in
LID Design: Rainwater
Collection Systems &
Vegetated Roofs
Advanced Topics in LID
Design: Bioretention
Media and Compost
Amended Soils
OVERVIEW OF PROGRAM
Advanced Topics for
Long‐term LID
Operations:
Bioretention
Intermediate
LID Design:
Bioretention
Advanced Topics for
Long‐term LID
Operations:
Permeable Pavement
Intermediate LID
Design: Site
Assessment, Planning
& Layout
Training Program
Statewide LID
ADVANCED LID DESIGN
RAINWATER COLLECTION SYSTEMS &
VEGETATED ROOFS
AGENDA
introduction
rainwater collection systems
vegetated roofs
wrap up
AGENDA
rainwater collection systems
vegetated roofs
wrap up
introduction
RAINWATER SYSTEMS & VEGETATED ROOFS
Statewide LID Training Program
INTERMEDIATE TOPICS IN LID DESIGN
LEARNING OBJECTIVES
• Participants gain an intermediate level knowledge
necessary to coordinate activities for entry level
design and implementation of rainwater collection
systems and vegetated roofs in residential and
commercial settings (new and retrofit).
• Participants learn basic entry level design and
implementation approaches for rainwater
collection systems and vegetated roofs in
residential and commercial settings.
• Participants learn practical skills necessary for
construction of basic rainwater collection systems
and vegetated roofs.
RAINWATER SYSTEMS & VEGETATED ROOFS
Statewide LID Training Program
INTERMEDIATE TOPICS IN LID DESIGN
LOGISTICS
SCHEDULE
• 4‐hour training with one
break
• Sign in and sign out
OTHER LOGISTICS
• Restroom location
• Snacks
• Turn off cell phones
• Q&A at end of each section
RAINWATER SYSTEMS & VEGETATED ROOFS
Statewide LID Training Program
INTERMEDIATE TOPICS IN LID DESIGN
LID Principles: Pre‐developed forest
INTRODUCTION & REGULATIONS
2012 LID Technical Guidance Manual for Puget Sound
RAINWATER SYSTEMS & VEGETATED ROOFS
Statewide LID Training Program
INTERMEDIATE TOPICS IN LID DESIGN
LID Principles: Developed condition
INTRODUCTION & REGULATIONS
2012 LID Technical Guidance Manual for Puget Sound
RAINWATER SYSTEMS & VEGETATED ROOFS
Statewide LID Training Program
INTERMEDIATE TOPICS IN LID DESIGN
LOW IMPACT DEVELOPMENT (LID):
Stormwater Management Strategy
INTRODUCTION & REGULATIONS
• Site design & planning techniques
emphasizing conservation
• Use of small‐scale & distributed
engineered controls to closely mimic
pre‐development hydrologic processes
• Minimizing the concentration of
stormwater
• Careful assessment of site soils and
strategic site planning to best use those
soils for stormwater management
RAINWATER SYSTEMS & VEGETATED ROOFS
Statewide LID Training Program
INTERMEDIATE TOPICS IN LID DESIGN
LID Principles: Site Design And Planning
INTRODUCTION & REGULATIONS
• Minimize disturbance
• Reduce impervious
surface
• Protect and restore
native soils and
vegetation
• Manage stormwater
close to the source in a
system of distributed
practices
• Disconnect impervious
surfaces
Traditional
LID
RAINWATER SYSTEMS & VEGETATED ROOFS
Statewide LID Training Program
INTERMEDIATE TOPICS IN LID DESIGN
LID BMPs: Small‐Scale Engineering Controls
INTRODUCTION & REGULATIONS
• Infiltration
• Filtration
• Storage
• Evaporation
• Transpiration
Synonyms for LID BMPs:
Green Stormwater Infrastructure (GSI), Integrated Management Practices (IMPs), and On-Site Stormwater Management
BMPs
Conserve or regain
pre‐developed hydrologic
functions
RAINWATER SYSTEMS & VEGETATED ROOFS
Statewide LID Training Program
INTERMEDIATE TOPICS IN LID DESIGN
Western WA NPDES Permit
National Pollutant Discharge Elimination System (NPDES) Municipal Stormwater
Permits (2013‐2018 permit cycle)
Municipal Stormwater Permittees in Washington State
Phase 1 Permittees
Western Washington
Phase II Permittees
Eastern Washington
Phase II Permittees
Seattle
Tacoma
Clark County
King County
Pierce County
Snohomish County
82 Cities
5 Counties
18 Cities
5 Counties
Secondary Permittees: Approximately 45; such as ports and universities
To see a listing of permittees visit
http://www.ecy.wa.gov/programs/wq/stormwater/municipal/MuniStrmWtrPermList.html
INTRODUCTION & REGULATIONS
RAINWATER SYSTEMS & VEGETATED ROOFS
Statewide LID Training Program
INTERMEDIATE TOPICS IN LID DESIGN
NPDES PERMIT LID REQUIREMENTS:
Implementation Timeline Varies By Permittee
INTRODUCTION & REGULATIONS
Review and revise development related codes, rules & standards (i.e. adopt the
2012 Stormwater Manual)
Timeline for updating local codes
Phase I
Per Section S5.C.5.b of
the Phase I Permit
Phase II
June
2014
June 30,
2015
Dec. 31,
2016*
June 30,
2017
June 30,
2018
Most
Permittees
Permittees in
Lewis & Cowlitz
Counties
City of
Aberdeen
Per Section S5.C.4 of the Phase II Permit
* = Or GMA update deadline
RAINWATER SYSTEMS & VEGETATED ROOFS
Statewide LID Training Program
INTERMEDIATE TOPICS IN LID DESIGN
NPDES MUNICIPAL STORMWATER PERMIT:
Minimum Requirements (MRs)
Preparation of Stormwater Site Plans
Construction Stormwater Pollution
Prevention Plan (SWPPP)
Source Control of Pollution
Preservation of Natural Drainage
Systems and Outfalls
On‐Site Stormwater Management
Run‐off Treatment
Flow Control
Wetlands Protection
Operations and Maintenance
INTRODUCTION & REGULATIONS
RAINWATER SYSTEMS & VEGETATED ROOFS
Statewide LID Training Program
INTERMEDIATE TOPICS IN LID DESIGN
Onsite SW Management BMP
Flow Control
Credit
Treatment
Credit1
Soil Amendment
Dispersion
Retaining & Planting Trees
Rainwater Harvesting
Bioretention3
Permeable Pavement3
Vegetated Roofs 3
DEFINITIONS
Subset of On‐site Stormwater Management BMPs used to meet MR #6 or MR #7
(may also be used to meet MR #5)
1 Meets basic, enhanced and phosphorus treatment when infiltrating through soil per Ecology treatment requirements
2 Where permeable pavement is over soils meeting the suitability criteria or a treatment layer is included
3Also considered SW Treatment & Flow Control BMPs/Facilities (additional requirements in regard to long term
inspection, operations, and maintenance apply)
INTRODUCTION & REGULATIONS
Q&A
AGENDA
introduction
rainwater collection systems
vegetated roofs
wrap up
RAINWATER SYSTEMS & VEGETATED ROOFS
Statewide LID Training Program
INTERMEDIATE TOPICS IN LID DESIGN
Introduction
RAINWATER COLLECTION SYSTEMS
• What is Rainwater
Collection
• History of Rainwater
Collection
• Definitions
• Reclaimed water
• Greywater
• Rainwater
• Benefits of Rainwater
Harvesting
RAINWATER SYSTEMS & VEGETATED ROOFS
Statewide LID Training Program
INTERMEDIATE TOPICS IN LID DESIGN
Introduction
RAINWATER COLLECTION SYSTEMS
RAINWATER SYSTEMS & VEGETATED ROOFS
Statewide LID Training Program
INTERMEDIATE TOPICS IN LID DESIGN
System Types
RAINWATER COLLECTION SYSTEMS
• Non‐Potable
• toilets
• urinals
• trap primers for floor
drains and floor sinks
• irrigation
• industrial processes
• water features
• cooling tower makeup
RAINWATER SYSTEMS & VEGETATED ROOFS
Statewide LID Training Program
INTERMEDIATE TOPICS IN LID DESIGN
System Types
RAINWATER COLLECTION SYSTEMS
• Potable
• Sole Source
• Redundant
• Gravity or Pumped
• Commercial / Residential
• Single Building or
Community Scale
• Simple
• Complex
• Hybrid Stormwater Systems
RAINWATER SYSTEMS & VEGETATED ROOFS
Statewide LID Training Program
INTERMEDIATE TOPICS IN LID DESIGN
System Components
RAINWATER COLLECTION SYSTEMS
Roofing
• For potable systems powder coated metal
roofing is preferred
• Others can be considered
• Ecology water quality testing results
• Potable source control (UPC Appendix K)
• Wood Roofing Materials
• Lead Flashing
• Roof paints and coatings with lead, chromium,
or zinc
RAINWATER SYSTEMS & VEGETATED ROOFS
Statewide LID Training Program
INTERMEDIATE TOPICS IN LID DESIGN
System Components
RAINWATER COLLECTION SYSTEMS
Collection
• Gutters
• Screens
• Wet vs. dry conveyance
• Sumps & relay pumping
• Freeze protection
RAINWATER SYSTEMS & VEGETATED ROOFS
Statewide LID Training Program
INTERMEDIATE TOPICS IN LID DESIGN
System Components
RAINWATER COLLECTION SYSTEMS
Pre‐Filtration
• Filter Examples
• Pre‐filtration vs. roof washer
• 100 micron per UPC 1709.9.11
Chris Webb & Associates, Inc.
RAINWATER SYSTEMS & VEGETATED ROOFS
Statewide LID Training Program
INTERMEDIATE TOPICS IN LID DESIGN
System Components
RAINWATER COLLECTION SYSTEMS
Storage (Cistern)
Design requirements
• Structural
• Access
• Overflow
• Isolate and drain for maintenance
• Screen all penetrations for vermin and
insects
• Freeze protection
RAINWATER SYSTEMS & VEGETATED ROOFS
Statewide LID Training Program
INTERMEDIATE TOPICS IN LID DESIGN
System Components
RAINWATER COLLECTION SYSTEMS
Storage (Cistern) – Above Grade Metal
Chris Webb & Associates, Inc.
RAINWATER SYSTEMS & VEGETATED ROOFS
Statewide LID Training Program
INTERMEDIATE TOPICS IN LID DESIGN
System Components
RAINWATER COLLECTION SYSTEMS
Storage (Cistern) – Recycled
Chris Webb & Associates, Inc.
RAINWATER SYSTEMS & VEGETATED ROOFS
Statewide LID Training Program
INTERMEDIATE TOPICS IN LID DESIGN
System Components
RAINWATER COLLECTION SYSTEMS
Storage (Cistern) – Above Grade Plastic
Chris Webb & Associates, Inc.
RAINWATER SYSTEMS & VEGETATED ROOFS
Statewide LID Training Program
INTERMEDIATE TOPICS IN LID DESIGN
System Components
RAINWATER COLLECTION SYSTEMS
Storage (Cistern) – Below Grade Plastic
RAINWATER SYSTEMS & VEGETATED ROOFS
Statewide LID Training Program
INTERMEDIATE TOPICS IN LID DESIGN
System Components
RAINWATER COLLECTION SYSTEMS
Storage (Cistern) – Below Grade Concrete (cast in place)
Chris Webb & Associates, Inc.
RAINWATER SYSTEMS & VEGETATED ROOFS
Statewide LID Training Program
INTERMEDIATE TOPICS IN LID DESIGN
System Components
RAINWATER COLLECTION SYSTEMS
Storage (Cistern) – Below Grade Concrete (Pre‐Cast)
Chris Webb & Associates, Inc.
RAINWATER SYSTEMS & VEGETATED ROOFS
Statewide LID Training Program
INTERMEDIATE TOPICS IN LID DESIGN
Storage options with costs
RAINWATER COLLECTION SYSTEMS
$0.50
$1.50
$2.00
$4‐$6
Approximate cistern costs per gallon stored by tank type
RAINWATER SYSTEMS & VEGETATED ROOFS
Statewide LID Training Program
INTERMEDIATE TOPICS IN LID DESIGN
System Components
RAINWATER COLLECTION SYSTEMS
Pumping & Distribution
• Freeze protection
• Suctions
• Floating
• Static
• Float Switches
RAINWATER SYSTEMS & VEGETATED ROOFS
Statewide LID Training Program
INTERMEDIATE TOPICS IN LID DESIGN
System Components
RAINWATER COLLECTION SYSTEMS
Pumping & Distribution
• Controls
• Variable Speed vs. single speed with
pressure tank
• Jet pumps
• Submersible pumps
RAINWATER SYSTEMS & VEGETATED ROOFS
Statewide LID Training Program
INTERMEDIATE TOPICS IN LID DESIGN
System Components
RAINWATER COLLECTION SYSTEMS
Filtration: Non‐potable
• Depends on use
• Typically 20‐50µ
RAINWATER SYSTEMS & VEGETATED ROOFS
Statewide LID Training Program
INTERMEDIATE TOPICS IN LID DESIGN
System Components
RAINWATER COLLECTION SYSTEMS
Filtration: SF Residential Non‐Potable Filter example
Chris Webb & Associates, Inc.
RAINWATER SYSTEMS & VEGETATED ROOFS
Statewide LID Training Program
INTERMEDIATE TOPICS IN LID DESIGN
System Components
RAINWATER COLLECTION SYSTEMS
Filtration: community Non‐Potable Filter example
Mithun
RAINWATER SYSTEMS & VEGETATED ROOFS
Statewide LID Training Program
INTERMEDIATE TOPICS IN LID DESIGN
System Components
RAINWATER COLLECTION SYSTEMS
Filtration: community Non‐Potable Filter example
Chris Webb & Associates, Inc.
RAINWATER SYSTEMS & VEGETATED ROOFS
Statewide LID Training Program
INTERMEDIATE TOPICS IN LID DESIGN
System Components
RAINWATER COLLECTION SYSTEMS
Filtration: community Non‐Potable Filter example
Chris Webb & Associates, Inc.
RAINWATER SYSTEMS & VEGETATED ROOFS
Statewide LID Training Program
INTERMEDIATE TOPICS IN LID DESIGN
System Components
RAINWATER COLLECTION SYSTEMS
Filtration: Potable
• Pollutants of Concern
• Filtration
• Disinfection
RAINWATER SYSTEMS & VEGETATED ROOFS
Statewide LID Training Program
INTERMEDIATE TOPICS IN LID DESIGN
System Components
RAINWATER COLLECTION…