What is the MINIMUM change in elevation for the smallest diameter building sewer 120 feet long that is permitted to serve eight bathrooms of an apartment building
20 inches is the minimum change in elevation for the smallest diameter building sewer serving eight bathrooms.
This requirement ensures proper drainage and flow within the sewer system, accommodating the water demand from multiple bathrooms effectively. The elevation change is critical to prevent blockages and ensure optimal wastewater management.
While a 25-inch elevation change could provide sufficient drainage, it exceeds the minimum requirement stipulated in plumbing codes for the given scenario. Excessive slope can lead to increased velocity, which might cause sediment transport issues and potential erosion within the sewer system.
This is the correct answer, as it aligns with plumbing codes that specify a minimum slope of 1/4 inch per foot for building sewers. For a 120-foot long sewer, this results in a total elevation change of 20 inches, which is adequate for the effective drainage of eight bathrooms.
A 15-inch elevation change does not meet the minimum slope requirement for the sewer length specified. This insufficient slope could lead to inadequate drainage, increasing the likelihood of backups and other plumbing issues, particularly in a system servicing multiple bathrooms.
This option represents an even lower elevation change than 15 inches, which is inadequate for effective drainage in a building sewer. Such a minimal slope may result in slow wastewater flow, potentially causing clogs and other drainage problems over time.
The minimum elevation change of 20 inches for a 120-foot sewer serving eight bathrooms is crucial for maintaining proper drainage and preventing plumbing issues. While higher slopes may provide more drainage, only 20 inches meets the code requirements without risking system functionality, ensuring effective waste management in the apartment building.
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