What is the acceptable percolation time range for shallow buried trench systems?

What is the acceptable percolation time range for shallow buried trench systems?

• A. 0-0.5 min/cm
• B. 1-125 min/cm
• C. 50-200 min/cm
• D. 125-250 min/cm

Answer: (B)

The main idea here is how quickly soil can absorb and move wastewater away from the trench, expressed as minutes per centimeter of depth. For shallow buried trench systems, you want a pace that’s not too fast and not too slow. If the percolation time is too fast, the effluent moves through the soil before there’s adequate contact with the soil to start treatment, and if it’s too slow, water may back up or pond, reducing system performance. The range that fits this balance is 1 to 125 minutes per centimeter. It covers soils that drain reasonably quickly to those that are slower but still capable of handling the effluent within a practical design. Ranges that start at or below zero would imply an excessively fast drainage, which isn’t suitable for these systems, while ranges extending well beyond 125 minutes per centimeter suggest soils that drain too slowly for shallow trenches to function properly.

The main idea here is how quickly soil can absorb and move wastewater away from the trench, expressed as minutes per centimeter of depth. For shallow buried trench systems, you want a pace that’s not too fast and not too slow. If the percolation time is too fast, the effluent moves through the soil before there’s adequate contact with the soil to start treatment, and if it’s too slow, water may back up or pond, reducing system performance. The range that fits this balance is 1 to 125 minutes per centimeter. It covers soils that drain reasonably quickly to those that are slower but still capable of handling the effluent within a practical design.

Ranges that start at or below zero would imply an excessively fast drainage, which isn’t suitable for these systems, while ranges extending well beyond 125 minutes per centimeter suggest soils that drain too slowly for shallow trenches to function properly.