Slide 12 of 87
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By using overlay zoning, the same barrier island and its resources can be protected.
Impervious Overlay Zoning: This specific type of overlay zoning limits future impervious area by estimating the environmental impacts of future impervious cover and setting a limit on the maximum imperviousness within a given planning area. Site development proposals are then reviewed in the context of an imperviousness cap. Subdivision layout options must then conform to the total impervious limit of the planning area.
Performance Zoning: This technique is designed to ensure an acceptable level of performance within a given zoning district such as providing a certain open space ratio, an impervious area target, or a desirable density. Performance zoning is a flexible approach that has been employed in a variety of fashions in several different communities across the country. Some performance factors include traffic or noise generation limits, lighting requirements, stormwater runoff quality and quantity criteria, protection of wildlife and vegetation, and even architectural style criteria.