They are doing so currently in central Arkansas - the Lake Maumelle watershed to be specific. The rights of private property owners will be restricted in the use of their land to conform with the land use plan. They are doing so under the guise of environmental protections and watershed protection, but it a thin veil of horse manure.
Google Lake Maumelle Watershed and you should get thousands of hits - both the liberal envirotard web stuffing of the ArkTimes, but also from Tea Pary groups who have been fighting the encroachment. An example of what it mandates if passed: 25% of your private lot must remain undisturbed, no sturctures over 2 stories tall, the height of fences is stipulated, etc. It is not about watershed protection as much as it is about removing your contol over private land that you own.
Zoning laws are the favored means of control of local tyrants everywhere. The watermelon greens (green on the outside, red on the inside) have seen them as a way to institute detailed control at the state and federal level that would never be tolerated locally.
This is what is going on with Agenda 21 and numerous referendums and legislative systems around the country. In Arizona we surrendered a significant amount of local control over zoning to the State for just these sort of rules. It is taking property without compensation.
The forbidding of significant walls around a property (3 foot tall fences in front, no more than 6 foot in the back and sides), is to insure that the enforcement agents can see what is in your property to enforce the zoning codes.