Drainlayer Tradesman Practice Exam

In a stormwater system, subsoil drains should be connected through which arrangement?

Direct to the watercourse A silt trap or sump A plain tee without sediment control A filter garment

Correct Answer:

A silt trap or sump

Explanation:

Sediment control is essential when routing subsoil drains. As drainage collects water and moves through trenches, sediment can be carried along. Placing drains through a silt trap or sump gives a built-in point for sediment to settle and be removed before the water reaches the stormwater system or a watercourse, reducing pollution and meeting environmental requirements. Discharging directly to a watercourse would carry sediment downstream, and a plain tee without sediment control won’t trap solids. A filter garment isn’t a practical or standard method for this purpose either.

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