What is the FF formula for a house with up to 3 bedrooms?

The correct choice represents the formula used to determine the facility flow (FF) for a house with up to three bedrooms, which is calculated based on the typical water usage per bedroom. In this context, the formula indicates that each bedroom contributes a specific gallons per day (GPD) value, which is then adjusted by dividing by a standard capacity, allowing for the assessment of whether the septic system can handle the expected flow.

In this formula, the multiplier of 150 GPD per bedroom effectively estimates the daily sewage flow based on common household usage patterns. The overall division by 300 GPD reflects a standard measure, likely representing the capacity of the septic system or a component thereof, thereby normalizing the flow rate to ensure that the formula provides a reasonable flow rate based on the size of the household. This formula takes into account typical water usage trends for homes with multiple bedrooms and is critical for proper septic system design and planning.

Understanding this formula is essential for evaluating whether a septic system is adequate for the anticipated use of the property. Properly calculating the flow can help prevent system failures and ensure compliance with regulations, maintaining public health and environmental standards.