Logic tells me that if we use pervious pavement for a passive application that the CN value should be the same as the subgrade. That is, if the pervious pavement section uses the insitu material for subgrade then the CN value should be the same for both pre and post development. Is this a...
While I have seen numerous publications (IBC, ADA, etc) for the requirement of railings for building construction, I know of no such codes, guidelines or industry standards for railings for exterior/site applications such as headwalls or retaining walls.
In the past I have used "judgement" when...
