What is the slope ratio for a 150 mm storm drain?

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Prepare for the 3rd Year Electrical Trades Qualification (TQ) exam. Use flashcards and multiple choice questions to master the material. Each question comes with hints and explanations to help you succeed. Get set for your qualification!

Multiple Choice

What is the slope ratio for a 150 mm storm drain?

Explanation:
Slope ratio in gravity drainage expresses the gradient of the pipe — how much vertical drop occurs over a given horizontal length. For a 150 mm storm drain, the minimum practical slope used to keep the flow moving and avoid deposits is 1:100. That means about 1 centimeter of drop per meter of pipe, or a 1% gradient. So the correct choice corresponds to a moderate, self-cleansing gradient: 1:50 would be much steeper (about 20 mm per meter), 1:200 would be quite flat (about 5 mm per meter), and 1:20 would be very steep (about 50 mm per meter).

Slope ratio in gravity drainage expresses the gradient of the pipe — how much vertical drop occurs over a given horizontal length. For a 150 mm storm drain, the minimum practical slope used to keep the flow moving and avoid deposits is 1:100. That means about 1 centimeter of drop per meter of pipe, or a 1% gradient.

So the correct choice corresponds to a moderate, self-cleansing gradient: 1:50 would be much steeper (about 20 mm per meter), 1:200 would be quite flat (about 5 mm per meter), and 1:20 would be very steep (about 50 mm per meter).

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