What is the maximum drainage fixture units allowed for a 6 inch drain line with a slope of 1/8 inch per foot?

The maximum drainage fixture units allowed for a 6-inch drain line with a slope of 1/8 inch per foot is based on plumbing code standards and guidelines. In general, a 6-inch drain line is designed to handle a substantial volume of wastewater and can accommodate a high number of drainage fixture units due to its larger diameter compared to smaller drain lines.

According to plumbing codes, a 6-inch drain line can typically handle up to 700 drainage fixture units when calculated with a slope of 1/8 inch per foot. This slope is sufficient to ensure proper drainage without causing blockages or slow movement of wastewater, making it suitable for handling higher fixture units effectively.

The rationale behind this capacity is connected to the flow rate that a 6-inch pipe can achieve along with the velocity of the wastewater being discharged. Adequate sizing and slope contribute to efficient waste transport from multiple plumbing fixtures, ensuring that the system operates effectively without overflow or backup.

Overall, recognizing that the design and slope of drainage systems are crucial factors that impact their performance justifies why the correct choice indicates a maximum of 700 drainage fixture units for this scenario.