The surface water drainage system shall adequately dispose of surface runoff from the street and adjacent areas and shall be installed in accordance with the following requirements:

1. Pipes, Culverts and Drains:

Pipe for the construction of culverts and drainage system pipes shall be reinforced concrete ASTM C-76 Class 4. All pipe shall not be less than twelve (12) inches in diameter. Pipe joints shall be carefully made so that the spigot is tightly butted to the seat of the bell and the spacing between the spigot is uniformly proportioned and caulked with loose or braided jute. In all cases the joints shall be filled with cement

Mortar unless rubber gasket type joints are used.

Pipes shall be laid in a bed of six (6") inches of processed gravel conforming to MHD Standard Specification Section M1.03.01 or crushed stone conforming to M11D Standard Specification Section M2.01.3. All utility trenches shall be backfilled with bank gravel conforming to M11D Standard Specification Section M1.03.0 Type 6 carefully compacted level with adjacent grades. When pipes, culverts or drains are not located in the street or street shoulder, six (6) inches of loam shall be placed over the trench fill, and the grades shall be leveled with adjacent terrain. All drains shall be laid to uniform grades and shall be carefully backfilled so that the pipe is supported throughout it entire length with compacted earth. Earth cover shall be a minimum of three (3) feet, except where a greater pipe strength is requested and approved by the board.

2. Catch Basins:

All catch basins shall have a four (4) foot deep sump and shall discharge into manholes. The distance between two (2) catch basins shall be as determined by approved hydraulic calculations, but not to exceed three hundred (300) feet, however, the Planning Board may approve a greater distance if deemed advisable due to unusual field conditions and justifiable by calculations.

Supplementary catch basins shall be provided as required adjacent to catch basins at low points to prevent ponding if the low point basin grate and inlet become clogged.

The materials and construction of catch basins and drain manholes shall conform to the M11D Standard Specifications Section 2.01. Any change in alignment or grade, if not normally the location of a catch basin, shall be made by using a standard manhole conforming to the above specifications. Catch basins and drain manholes shall be constructed or pre-cast concrete. Drain manholes shall contain ladder rungs and brick and/or concrete inverts. Catch Basins and sewer manhole structures shall have a minimum forty-eight (48") inch inside diameter.