The storm drainage system shall be constructed in accordance with the following standards and procedures.
(A) Pipe. All pipe used shall be of high density polyethylene or reinforced concrete meeting State Highway Department specifications. In some instances the Board of Selectmen may recommend use of corrugated metal pipe where it feels pipe will provided a more satisfactory drainage system.
(B) Joints. The joints of all pipe shall be shoved tight. Pipe laid in sandy, silty or other soil where, in the Judgment of the Board of Selectmen, there is danger of washing or cave-ins, or near leaching fields, shall have joints thoroughly sealed with 1:3 portland cement mortar.
(C) Catch basins and manholes. Catch basins and manholes shall be constructed in accordance with the plans set by the Board of Selectmen. Manholes shall be constructed of solid concrete radial manhole blocks six inches thick. Catch basins shall be constructed of eight inch solid concrete blocks. Except at the crest of a grade no portion of any road shall drain in one direction a distance of more than approximately 300 feet without catch basins on both sides of the road.
(D) Headwalls, culverts and bridges. Headwalls, culverts and bridges shall be constructed where required, in accordance with good engineering practice and as specified by the Board of Selectmen.
(E) Open ditches. Open ditches may be permitted at the discretion of the Board of Selectmen. The size of the waterway shall be of sufficient size to convey all water expected to be discharged and shall be suitably stabilized against erosion. The side banks shall be moderately sloped, not less than two horizontal to one vertical and then seeded or otherwise stabilized as indicated on approved plans. Town inspection shall be required when completed.
(F) Construction procedure. Construction procedure shall be as follows.
(1) All pipe shall be laid to line and grade as shown on approved drainage plans and profiles.
(2) Line and grade stakes shall be maintained in good order until the work has been inspected and approved by the Board of Selectmen.
(3) Three batter boards shall be maintained in place at all times when laying pipe and shall not be spaced more than 30 feet apart.
(4) No pipe shall be backfilled until inspected and approved by the Board of Selectmen.
(Ord. passed 4-1-1968; Ord. passed 12-13-1976; Ord. passed 8-16-1982)