[3-7-2023(1)]
The standards in this Division shall apply to the construction of roads and/or driveways and drainage systems, culverts and other related features that are located within the shoreland zone.
[3-7-2023(1)]
(a)
Roads and driveways shall comply with the following setback requirements:
(1)
In the General Development, Urban Residential, Stream Development and Manufactured Housing Community districts, newly constructed roads and driveways shall be set back a minimum of 25 feet from the normal high water line. If an existing road or driveway does not satisfy this minimum setback requirement, the Planning Board may allow an expansion of the road or driveway, provided none of the road or driveway is located closer to the setback requirement than the existing road or driveway.
(2)
In the Waterfront Development District, there is no setback requirement from the normal high water line for roads and driveways.
(3)
In the Limited Residential district, new roads and driveways shall be set back at least 100 feet from the normal high-water line of Upper Mason Pond and the portion of the Goose River that flows into this Pond, and 75 feet from the normal high-water line of other water bodies, tributary streams, or the upland edge of a wetland unless no reasonable alternative exists as determined by the Planning Board. If no other reasonable alternative exists, the Planning Board may reduce the road or driveway setback requirement to no less than 50 feet upon clear showing by the applicant that appropriate techniques will be used to prevent sedimentation of the water body, tributary stream or wetland. Such techniques may include, but are not limited to, the installation of settling basins, and/or the effective use of additional ditch relief culverts and turnouts placed so as to avoid sedimentation of the water body, tributary stream, or wetland. If an existing road or driveway does not satisfy the minimum setback requirement, the Planning Board may allow an expansion of the existing road or driveway, provided none of the expansion is located closer to the setback requirement than the existing road or driveway.
(b)
In all districts identified in Subsection (a) above, on slopes of greater than 20 percent, the road or driveway setback shall be increased by 10 feet for each 5 percent increase in slope above 20 percent.
(c)
This Section shall neither apply to approaches to water crossings nor to roads or driveways that provide access to permitted structures and facilities located nearer to the shoreline due to an operational necessity, excluding temporary docks for recreational uses. Roads and driveways providing access to permitted structures within the setback area shall comply fully with the requirements of this Section, except for the portion of the road or driveway necessary for direct access to the structure.
[3-7-2023(1)]
Notwithstanding the provisions identified in Section 82-282, existing public roads may be expanded within the legal road right-of-way, regardless of the amount of setback from a water body, tributary stream or wetland.
[3-7-2023(1)]
New roads and driveways are prohibited in a Resource Protection or Stream Protection District, except that the Planning Board may grant a permit to construct a road or driveway to provide access to permitted uses within the respective district. In said Districts, a road or driveway may be approved by the Planning Board upon a finding that no reasonable alternative route or location is available outside the respective district, in which case the road or driveway shall be set back as far as practicable from the normal high-water line of a water body, tributary stream, or upland edge of a wetland.
An existing road or driveway in a Resource Protection or Stream Protection District that provides access to a permitted or pre-existing use (use established prior to the date that the Resource Protection or Stream Protection designation applied to the property) may remain, and may be expanded, subject to a finding by the Planning Board that none of the expansion shall be located closer to the normal high-water line of a water body, tributary stream, or upland edge of a wetland, and that the existing road or driveway is the most reasonable alternative to provide access.
[3-7-2023(1)]
Road banks shall be no steeper than a slope of two horizontal to one vertical, and preferably a slope of three horizontal to one vertical, and shall be graded and stabilized in accordance with the provisions for erosion and sedimentation control contained in Division 13 of this Article.
[3-7-2023(1)]
Road banks shall conform to specifications identified in the Chapter 98, Technical Standards, and shall be no greater than 10 percent except for short segments of less than 200 feet in length.
[3-7-2023(1)]
In order to prevent road surface drainage from directly entering water bodies, tributary streams, and wetlands, roads shall be designed, constructed, and maintained to empty onto an unscarified buffer strip at least 50 feet plus two times the average slope in width between the outflow point of the ditch or culvert and the normal high-water line of a water body, tributary stream, or upland edge of a wetland. Road surface drainage which is directed to an unscarified buffer strip shall be diffused or spread out to promote infiltration of the runoff and to minimize channelized flow of the drainage through the buffer strip. This standard shall not apply to roads and driveways in the Waterfront Development District.
[3-7-2023(1)]
(a)
Ditch relief (cross drainage) culverts, drainage dips and water turnouts shall be installed in a manner effective in directing drainage onto un-scarified buffer strips before the flow in the road or ditches gains sufficient volume or head to erode the road, driveway, or ditch. To accomplish this, the following construction standards shall apply:
Grade (percent) | Spacing (feet) |
|---|---|
0-2 | 250 |
3-5 | 200-135 |
6-10 | 100-80 |
11-15 | 80-60 |
16-20 | 60-45 |
21+ | 40 |
(b)
Drainage dips may be used in place of ditch relief culverts only where the road grade is 10 percent or less.
(c)
On road sections having slopes greater than 10 percent, ditch relief culverts shall be placed across the road at approximately a 30° angle downslope from a line perpendicular to the centerline of the road or driveway.
(d)
Ditch relief culverts shall be sufficiently sized and properly installed in order to allow for effective functioning, and their inlet and outlet ends shall be stabilized with appropriate materials.
[3-7-2023(1)]
Ditches, culverts, bridges, dips, water turnouts and other stormwater runoff control installations associated with roads and driveways shall be maintained on a regular basis to ensure effective functioning.