{Tidal Potomac Fly Rodders} Motivation for a special regulations and delayed harvest sections

In the context of trout streams that are not stocked by the state, what motivates the designation of a Special Regulations section.  Case in point, the Hazel River vs The Special Reg section of the Rapidan.  What is different about the Rapidan that warrants special regulations whereas the Hazel river is only covered by the usual 6 less than 7".  Is this motivated by some biological aspect of the fishery? historical use of the river? some local landowner lobbying?

Along the same lines, what is the primary motivation for designating an area as delayed harvest section while others are just put and take?  The motivation for Delayed Harvest, in general, seems obvious; I am guessing it prevents the whole stretch of the creek being completely harvested within a short window after the stocking truck leaves allowing more anglers to have fun over a longer period of time.  But why designate one specific tailwater as delayed harvest while leaving another tailwater as put and take?

cheers

Corey

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