What does "hydraulic loading rate" refer to in an OSSF?

Hydraulic loading rate is a critical concept in the design and operation of On-Site Sewage Facilities (OSSF). It refers specifically to the quantity of wastewater that can be safely applied to the soil per day, measured typically in gallons per day per acre or similar units. This measure is essential because it determines how much water can be absorbed by the soil without causing saturation, which could lead to surface runoff, groundwater contamination, and other environmental concerns.

Understanding the hydraulic loading rate helps installers and designers optimize the size and layout of septic systems and other wastewater treatment systems to ensure effective treatment and disposal of wastewater. By adhering to the hydraulic loading rate, facilities can operate efficiently without overwhelming the soil's capacity to filter and treat the effluent.