In the world of small town zoning there is the concept of the “buffer”. The buffer is akin to the roll of super absorbent paper towels produced on the home-front after an accident has occurred.
So, lets say the City planners locate Industrial zoning in a low income neighborhood next to houses. Such a fence can be required as a buffer.
Screen 3 (“S-3″). The S-3 buffer/screen requires an opaque landscaping scheme, one that blocks views between two adjacent properties. This type of screening is for use between dissimilar land uses, where the maximum amount of visual shielding is desired. The plantings allowed by the S-3 designation consist of the following…
…With the approval of the director, an opaque wall or fence may be utilized for, or as part of, a required S-3 screen. Where allowed, such wall or fence (including any gate(s) forming a portion of such structure) shall be at least six (6) feet tall, or an alternate height deemed necessary by the director to protect required sight distances along a public right-of-way.–CHO Code 34-871
Does the fence stop the noise? Does it stop the smell? Does it block the view of the 85 foot tall manufacturing facility? No.
But it makes the planners feel they have done their job.