What is the purpose of the stone jacket layer in a bioretention system?

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Study for the DEQ Stormwater Management Inspector Test. Use flashcards and multiple choice questions with hints and explanations to prepare for your exam. Get ready and certified!

Multiple Choice

What is the purpose of the stone jacket layer in a bioretention system?

Explanation:
In a bioretention system, the stone jacket around the underdrain serves as a coarse filtration and separation layer between the soil media and the pipe. By surrounding the perforated underdrain with gravel or crushed stone, fines and sediment from the soil media are kept from entering and clogging the pipe, while water can still move freely into the underdrain. This preserves the drainage capacity and helps ensure the system drains as designed. It isn’t about stabilizing soil, providing structural support, or improving aesthetics, which is why the filtration/flow-path function is the best fit.

In a bioretention system, the stone jacket around the underdrain serves as a coarse filtration and separation layer between the soil media and the pipe. By surrounding the perforated underdrain with gravel or crushed stone, fines and sediment from the soil media are kept from entering and clogging the pipe, while water can still move freely into the underdrain. This preserves the drainage capacity and helps ensure the system drains as designed. It isn’t about stabilizing soil, providing structural support, or improving aesthetics, which is why the filtration/flow-path function is the best fit.

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