Presented to: Previous in Paradise - San Diego Presented by: Scott Erickson, Evolution Pervious

1. Importance of Site
Design
To pervious concrete pavements
By scott erickson

2. Why site design matters to you
So What if Site Design Sucks?
Who gets the blame?
Contractors
Suppliers
Pervious Industry

3. Presentation Teaching Goal
How to Avoid Site Design Disasters
 How to Prevent bad site designs
 How to Communicate and change a
bad design
 How to Protect the enormous New Market
From Extinction

4. Presentation Teaching Goal
What to do about it!
Recognize site designs
Educate designers well in advance
Communicate instead of litigate!!!
Know your allies, Use team approach

5. Swapping Pervious Surface from AC
BAD
PERVIOUS
DESIGN

6. BAD
PERVIOUS
DESIGN
Pervious
Clogs

7. BAD
PERVIOUS
DESIGN
Pervious
Clogs
Blame
Pervious

8. BAD
PERVIOUS
DESIGN Pervious
Clogs
Blame
Pervious
Sue
Contractor

9. BAD
PERVIOUS
DESIGN Pervious
Clogs
Blame
Pervious
Sue
Contractor
Pervious
Market
Dries Up

10. Really Bad Pervious Design
Photo courtesy of Dr. Heather Brown, Middle Tennessee State University
Do Not Use Pervious As A Trench Drain!

11. Failed Design AC/Pervious Blend

12. 2900 SF Pervious Concrete
No back up or overflow

13. Nearly 15,000 SF Impervious

16. Site & Grading Design
Asphalt tailings
clog pervious
Inadequate backup.
Use planter for backup
storage!

17. Recognize sediment exposure?
!
Prevention better by far!

18. Asphalt tailings

19. Oily Grit from AC flows onto pervious

20. Failed design. No sediment control
No back up drainage. Big Lawsuit.

21. Proper Pervious Design
Have back up drainage
Over flow System
Bio Swale
Drain to secondary detention
Grade separation
Structures

22. Drainage Backup Systems
Swale with elevated drain

23. Drainage Backup Systems
Swale with elevated drain

24. Site Designs
Grade separation & Overflow

25. Site Designs
Grade separation & Overflow

26. Site Designs
Sediment Walls

27. Site Designs
Curb cut backup drainage

28. More Pervious Friendly Designs
Isolate Sediment:
 Sediment traps
 French Drain
 Large non-woody ground cover

29. Grassy Swale
Grade separation
Barrier curb with grade
separation
Design to Protect from Sediment

30. Retrofitted Asphalt Lot

31. Replaced with pervious concrete

32. Sub-Grade Grading Plan

33. Drainage Backup Systems
• Install drainage along steep slopes.
1. Assist drainage down slope
2. Minimizes erosion of sub-grade soil

34. Site Design
Isolate sediment sources
•Bark chips on embankment
•Curb and French Drain
•Redundancy when able

35. Intercept Sediment Runoff
French drain used in this application.

36. Bio swale
Back up Infiltration

37. Four feet of amended soil below pavement
Bio swale

38. Trench Drain Isolates Sediment
Impervious
Concrete
Pervious
Concrete

39. Large Scale Sediment Isolation

40. Large Scale Sediment Isolation

41. Pervious Alley is Only Collection Point
26’ Alley collects water from entire site

42. Subbase Infiltration vaults/cleanout

43. Sediment Collection & Cleanout

45. Stormwater Collection Alley

46. Mix Design
Dependent on;
• Owner’s desired look
• Function of application
1/4” Crushed 3/8” Round
1/8” Crushed

47. Mix Design
Determine Application
Sidewalks Pathways
Parking Stalls
Streets

48. OK to say not a good site

49. Isolate Sediment

50. Add landscape fill before pervious
• Fill added
before Pervious
• Trench drain
isolates
impervious from
pervious surface

51. 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!

52. Importance of Site
Design To pervious Pavement
By Scott Erickson, NRMCA Pervious Craftsman
scott@evolutionpervious.com
www.evolutionpervious.com
415-852-0638