If the percolation time of the subsoils beneath a Class 2 sewage system is 40 min/cm, what is the loading rate of the side walls?

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Multiple Choice

If the percolation time of the subsoils beneath a Class 2 sewage system is 40 min/cm, what is the loading rate of the side walls?

Explanation:
Loading rate on the side walls is tied to how quickly the soil can accept effluent, expressed by the percolation time. A percolation time of 40 minutes per centimeter indicates a moderate infiltration capacity. In standard design practice for Class 2 systems, this level of soil absorption corresponds to a side-wall loading rate of 10 L/d/m². So the soil can safely accept about 10 liters per day for every square meter of trench sidewall. The other numbers would be used for soils with faster or slower percolation than 40 min/cm.

Loading rate on the side walls is tied to how quickly the soil can accept effluent, expressed by the percolation time. A percolation time of 40 minutes per centimeter indicates a moderate infiltration capacity. In standard design practice for Class 2 systems, this level of soil absorption corresponds to a side-wall loading rate of 10 L/d/m². So the soil can safely accept about 10 liters per day for every square meter of trench sidewall. The other numbers would be used for soils with faster or slower percolation than 40 min/cm.

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