. A planning guide for protecting Montana's wetlands and riparian areas . Wetlands; Wetland management; Riparian areas; Riparian areas. drawn to include the part of the lot suitable for building that avoids damage to or degradation of sensitive areas such as wetlands, riparian vegetation, flood- prone areas, and critical wildlife habitat. Building permits, zoning, subdivision regulations, and development permits are ideal for enforcing building envelopes. Building envelopes are also used in public interest covenants {see Public Interest Covenants, page 5-11) and conservation easements. If they
. A planning guide for protecting Montana's wetlands and riparian areas . Wetlands; Wetland management; Riparian areas; Riparian areas. drawn to include the part of the lot suitable for building that avoids damage to or degradation of sensitive areas such as wetlands, riparian vegetation, flood- prone areas, and critical wildlife habitat. Building permits, zoning, subdivision regulations, and development permits are ideal for enforcing building envelopes. Building envelopes are also used in public interest covenants {see Public Interest Covenants, page 5-11) and conservation easements. If they are incorporated into subdivision regulations, building envelopes can be difficult to enforce unless there is a pubhc interest covenant attached to the subdivision. Another way to enforce building envelopes is by cooperative agreements with the county sanitarian, since Montana law requires that the local sanitarian review all new septic I I Building Envelope I I Zone of Non-development Figure 2. The relationship of Building Envelopes to Zones of Non-development. Zones of Non-development A direct means of protecting wetlands and riparian areas is to prohibit development, filling, or other alterations in specific locations—instead of a "building envelope" being drawn to establish the part of the lot suitable for building, an "envelope" is drawn around the resource area that needs protection. At least two general categories of non-development "zones" are found in Montana. These two types of zones can be used in traditional zoning regulations, development permit regulations, subdivision regulations, and conservation easements. • "No-build ; No-build zones prohibit residential and commercial buildings. If specified, they can also include additions to an existing structure, decks, parking lots or other impervious surfaces, or similar improvements. • "No Improvement Zones" or "Zones of Non-
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