What aspect determines the design flow for sizing a tank in a private sewage system with a garbage grinder?

The design flow for sizing a tank in a private sewage system, especially when using a garbage grinder, is primarily determined by the combined waste from the entire property. This approach ensures that the septic system can accommodate all types of wastewater being generated, including contributions from bathrooms, kitchens, and laundry facilities.

When designing a septic system, it is crucial to understand that the tank must manage not only the solid and liquid waste from the kitchen, which includes waste from the garbage grinder, but also the waste produced from other fixtures throughout the property. This holistic view prevents issues such as system overload and ensures the longevity and effectiveness of the septic system. Taking into account all sources of wastewater allows for proper tank sizing that meets the needs of all residents, leading to effective waste treatment and safeguarding public health.

Other choices do not account for the comprehensive nature of residential sewage production. The number of residents alone provides a limited view, as different households may produce varying amounts of waste. Similarly, focusing only on the grinder's usage frequency or kitchen waste could overlook the contributions from bathrooms and other plumbing fixtures which are significant to the overall design flow.