critical importance of site design
TRANSCRIPT
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Importance of Site DesignTo pervious concrete pavementsBy scott erickson
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Why site design matters to you
So What if Site Design Sucks?Who gets the blame?ContractorsSuppliersPervious Industry
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Presentation Teaching Goal
How to Avoid Site Design DisastersHow to Prevent bad site designsHow to Communicate and change a
bad designHow to Protect the enormous New
Market From Extinction
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Presentation Teaching Goal
What to do about it!Recognize site designsEducate designers well in advanceCommunicate instead of litigate!!!Know your allies, Use team
approach
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Swapping Pervious Surface from AC
BAD PERVIO
US DESIGN
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BAD PERVIO
US DESIGN
Pervious Clogs
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BAD PERVIO
US DESIGN
Pervious Clogs
Blame Pervious
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BAD PERVIOU
S DESIGN
Pervious Clogs
Blame Pervious
Sue Contract
or
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BAD PERVIOU
S DESIGN
Pervious Clogs
Blame Pervious
Sue Contract
or
PerviousMarket
Dries Up
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Really Bad Pervious Design
Photo courtesy of Dr. Heather Brown, Middle Tennessee State University
Do Not Use Pervious As A Trench Drain!
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Failed Design AC/Pervious Blend
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2900 SF Pervious ConcreteNo back up or overflow
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Nearly 15,000 SF Impervious
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Site & Grading Design
Asphalt tailings clog pervious
Inadequate backup. Use planter for backup
storage!
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Recognize sediment exposure?
!
Prevention better by far!
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Asphalt tailings
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Oily Grit from AC flows onto pervious
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Failed design. No sediment control No back up drainage. Big Lawsuit.
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Proper Pervious Design
Have back up drainage Over flow System
Bio SwaleDrain to secondary detention
Grade separationStructures
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Drainage Backup SystemsSwale with elevated drain
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Drainage Backup SystemsSwale with elevated drain
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Site Designs
Grade separation & Overflow
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Site Designs
Grade separation & Overflow
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Site Designs
Sediment Walls
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Site Designs
Curb cut backup drainage
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More Pervious Friendly Designs
Isolate Sediment: Sediment trapsFrench DrainLarge non-woody ground cover
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Grassy SwaleGrade separation
Barrier curb with grade separation
Design to Protect from Sediment
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Retrofitted Asphalt Lot
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Replaced with pervious concrete
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Sub-Grade Grading Plan
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Drainage Backup Systems• Install drainage along steep
slopes.1. Assist drainage down slope2. Minimizes erosion of sub-grade soil
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Site Design
Isolate sediment sources
•Bark chips on embankment•Curb and French Drain•Redundancy when able
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Intercept Sediment Runoff
French drain used in this application.
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Bio swale
Back up Infiltration
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Four feet of amended soil below pavement
Bio swale
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Trench Drain Isolates Sediment
Impervious
Concrete
Pervious Concrete
Trench
….Drains
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Large Scale Sediment Isolation
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Large Scale Sediment Isolation
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Pervious Alley is Only Collection Point26’ Alley collects water from entire site
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Subbase Infiltration vaults/cleanout
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Sediment Collection & Cleanout
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Stormwater Collection Alley
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Mix DesignDependent on; • Owner’s desired look• Function of application
1/4” Crushed 3/8” Round1/8” Crushed
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Mix DesignDetermine Application
Sidewalks Pathways
Parking Stalls
Streets
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OK to say not a good site
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Isolate Sediment
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Add landscape fill before pervious• Fill added
before Pervious• Trench drain
isolates impervious from pervious surface
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What if bad design already bid?
Notify the Project Engineer of deficiency Recommend NRMCA/ACI standard Contact Local Sponsoring Group or consultant Paulette Salisbury 925-918-0982
Technical Specialist at CA NV Cement Assoc.
Don’t ignore bad design, engineers want it right too!
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Importance of Site Design To pervious PavementBy Scott Erickson, NRMCA Pervious Craftsman
[email protected] 415-852-0638