What is the difference in flow between the highest and lowest day used in the week?

The difference in flow between the highest and lowest day used in the week is known as the peak-to-valley (or peak-to-average) flow variation. This concept is important in water system management because it helps determine the efficiency and capacity needs of the water distribution system.

The calculation of this difference would be based on recorded water usage over the week. If the highest day recorded a consumption of 10,000 gallons and the lowest day recorded 8,000 gallons, the difference would be calculated as 10,000 gallons - 8,000 gallons, resulting in a variation of 2,000 gallons.

Understanding this variation is critical for effective water system planning and can help in identifying trends in water use, making it easier to plan for peak demands and ensure that the supply system can handle fluctuations appropriately. High differences can point to seasonal usage changes or specific events affecting water use, guiding management to improve service and infrastructure accordingly. Thus, the assertion that the peak-to-valley flow difference amounts to 2,000 gallons is validated by this understanding of water usage patterns and system management.