What is the average domestic contribution to the collection system per person per day?

The average domestic contribution to the collection system per person per day is about 100 gallons. This figure is based on standard assumptions used in wastewater management and planning, which account for typical water use in residential settings.

This estimate encompasses various domestic activities such as drinking, cooking, bathing, laundry, and toilet use. It reflects the average daily water usage that eventually ends up in wastewater systems. Understanding this figure is critical for wastewater treatment facility design, as it helps in anticipating the flow rates and the volume of wastewater that needs to be treated.

Additionally, this 100-gallon figure serves as a benchmark for calculating capacity requirements and planning for infrastructure investments in wastewater systems. It is important for operators and engineers to utilize accurate estimates to ensure that the systems can manage peak flows and maintain compliance with environmental regulations.

In contrast, other answer choices represent figures that may not adequately reflect the comprehensive water usage patterns seen in residential settings, and using them could lead to underestimating system needs.