During a topography site evaluation, which two factors are essential considerations?

In the context of a topography site evaluation for On-Site Sewage Facilities (OSSF), slope and potential for flooding are essential considerations due to their significant impact on the effectiveness and safety of sewage systems.

The slope of the land affects how wastewater will be transported through the system. A slope that is too steep may lead to rapid drainage, causing inadequate treatment of the effluent as it does not have sufficient time for absorption and filtration. Conversely, a slope that is too flat can result in poor drainage, increasing the risk of system failure and surface water contamination.

The potential for flooding is equally important to consider. Flood-prone areas can lead to the inundation of the sewage system, compromising its functionality and possibly leaking untreated effluent into the surrounding environment. This can pose a public health risk and violate regulatory requirements, which is crucial for maintaining safe water quality and environmental standards.

When conducting a topographical evaluation, understanding these two factors helps ensure that the sewage system is designed and installed in a manner that minimizes risks and promotes effective wastewater management.