What are the Orthodox Slopes for NCARB

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Robert Ward

January 16, 2023 19:04

Does anyone have a table of the "correct" slopes according to NCARB?  There are multiple conflicting ideas of what a correct slope is.  This is what I learned for my Landscape Architect's License/ ASLA.  Correct or Not?

0.5% drainage min for concrete pavement

1% drainage min for asphalt, drainage min for swale longitudinal slope

2% drainage min for grass surface, max ADA cross slope

5% ADA max slope before ramps, parking lot max

8.33% ADA max ramp slope, curb cut standard.

33% max slope for grassed surfaces

50% max slope for not-grass planted surfaces

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  Rebekka O'Melia January 20, 2023 17:13

  This is a handy graphic.  

  

  I'd add that soccer & football fields need to be as close to flat as possible, while still having enough slope to drain, so 1-2% slope.

  Hope this helps!

  Rebekka O'Melia, Registered Architect, NCARB, B. Arch, M. Ed, Step UP,  Step UP ARE 5.0 Courses 

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  Robert Ward January 16, 2023 19:06

  Edit:  ref this other post https://are5community.ncarb.org/hc/en-us/community/posts/4413143561879-SLOPES

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