One of the purposes of water storage tanks is to:

Water storage tanks play a crucial role in the management of water supplies, particularly in helping to meet peak demands. During times of high water usage, such as during hot weather or peak consumption hours, these tanks store water that can be quickly accessed to ensure that supply meets the immediate demand. This function is essential for maintaining consistent water pressure and availability, helping to prevent shortages during busy periods.

By storing water when demand is lower, such as overnight or during off-peak hours, water storage tanks ensure that there is enough supply available to accommodate sudden increases in consumption. This aspect is vital for both residential and commercial areas, where water needs can fluctuate significantly throughout the day.

In contrast, the other options focus on functions that are not relevant to the primary purpose of water storage tanks. For instance, storing contaminated water is dangerous and counterproductive, as it poses health risks. Enhancing filtration and regulating temperature are important considerations in water treatment and distribution but are not direct functions served by storage tanks. Thus, the ability to supply water effectively during peak demands is why the correct response is emphasized.