44.Subsection (4) requires the authorised undertaker to take such steps as are reasonably practicable to secure that water is free from gravel, soil or other solid substances or from oil or matter in suspension. This might include installation of gullies, filter drains or settlement ponds(14) to separate out such matter from clean water before the water is discharged into a stream, watercourse or public sewer or drain. The precise means of separating such matter from clean water will be determined during the design process in consultation with all appropriate people and bodies, including the roads authority and the Scottish Environment Protection Agency, “SEPA”.
A “gully” is a concrete box with a pipe and a metal grid on top: solid materials settle on the bottom of the box and water to be discharged continues along the pipe. A “filter drain” (also known as a “French drain”) is a ditch filled with stones which act to remove large solid particles from the water before the water is discharged into the ground or a drainage system. A “settlement pond” is a large pond that allows water to sit while slow settlement of particles takes place.
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