What characterizes a gravel-less drainfield pipe?

A gravel-less drainfield pipe is characterized by being a specific type of sewage system component designed to enhance efficiency while eliminating the need for gravel. The correct answer highlights that these pipes are typically 8- or 10-inch in diameter and wrapped in geotextile fabric, which serves a crucial function in providing support and filtration. This fabric allows for water to flow through while preventing the entrance of soil and silt, maintaining optimal drainage and reducing the potential for clogging.

Gravel-less systems are designed to save on installation costs and improve the efficiency of wastewater absorption through a combination of their size and the properties of the geotextile fabric. The larger diameter allows for a greater volume of effluent to be handled, which is beneficial in areas where conventional smaller pipes might struggle.

Other options do not correctly reflect the characteristics of gravel-less drainfield pipes. Specifically, gravel is not required, which makes option A invalid. While these systems can be used in various environments and do not depend on arid conditions, thus making option C misleading. Finally, while gravel-less pipes can be larger in size compared to some conventional systems, the focus of the defining characteristic is the specific diameter and the use of geotextile fabric rather than simply being larger