[Ord. No. 8-1997, § 15(H), 7-15-1997]
The standards in this division shall apply to the construction of roads and/or driveways and drainage systems, culverts and other related features.
[Ord. No. 8-1997, § 15(H)(1), 7-15-1997; Ord. No. 16-2000, 8-15-2000; Ord. No. 20-2004, 1-6-2004; Ord. No. 3-2005, 7-20-2004]
(a) 
New roads and driveways in the General Development, and Urban Residential, Stream Development and Manufactured Housing Community districts shall be setback 25 feet from the normal high water line. There is no setback requirement from the normal high water line for new roads and driveways in the Waterfront Development district. New roads and driveways in the Limited Residential district 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 and/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. 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.
(b) 
On slopes of greater than 20%, the road and/or driveway setback shall be increased by 10 feet for each 5% increase in slope above 20%.
(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.
[Ord. No. 8-1997, § 15(H)(2), 7-15-1997]
Existing public roads may be expanded within the legal road right-of-way, regardless of the setback from a water body.
[1]
Editor's Note: Former Section 82-284, adopted 7-15-1997 by Ord. No. 8-1997, which contained provisions on new roads and driveways along significant river segments, was repealed 1-6-2004 by Ord. No. 20-2004.
[Ord. No. 8-1997, § 15(H)(4), 7-15-1997; Ord. No. 20-2004, 1-6-2004]
New roads and driveways are prohibited in a Resource Protection and Stream Protection Districts except to provide access to permitted uses within the respective district, or as 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 and/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.
[Ord. No. 8-1997, § 15(H)(5), 7-15-1997]
Road banks shall be no steeper than a slope of two 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.
[Ord. No. 8-1997, § 15(H)(6), 7-15-1997; Ord. No. 20-2004, 1-6-2004]
Road banks shall conform to specifications identified in chapter 98, Technical Standards, and shall be no greater than 10% except for short segments of less than 200 feet.
[Ord. No. 8-1997, § 15(H)(7), 7-15-1997; Ord. No. 3-2005, 7-20-2004]
In order to prevent road surface drainage from directly entering water bodies, 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.
[Ord. No. 8-1997, § 15(H)(8), 7-15-1997]
Ditch relief (cross drainage) culverts, drainage dips and water turnouts shall be installed in a manner effective in directing drainage onto unscarified buffer strips before the flow in the road or ditches gains sufficient volume or head to erode the road or ditch. To accomplish this, the following shall apply:
(1) 
Ditch relief culverts, drainage dips and associated water turnouts shall be spaced along the road at intervals no greater than indicated in the following table:
Road 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
(2) 
Drainage dips may be used in place of ditch relief culverts only where the road grade is 10% or less.
(3) 
On road sections having slopes greater than 10%, ditch relief culverts shall be placed across the road at approximately a thirty-degree angle downslope from a line perpendicular to the centerline of the road.
(4) 
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.
[Ord. No. 8-1997, § 15(H)(9), 7-15-1997]
Ditches, culverts, bridges, dips, water turnouts and other stormwater runoff control installations associated with roads shall be maintained on a regular basis to ensure effective functioning.