What is the minimum capacity a hydropneumatic storage tank must provide for fire demand?

The correct choice identifies that a hydropneumatic storage tank must provide a minimum capacity of 75,000 gallons for fire demand. This requirement is in place to ensure that there is an adequate supply of water available in case of a fire emergency, as fire demands can be significantly higher than regular water use during peak hours.

Hydropneumatic tanks serve the dual purpose of water storage and pressure management in distribution systems. The specified minimum capacity reflects the typical requirements set by fire codes and regulations, which dictate the amount of water necessary to effectively combat a structure fire. By maintaining a reserve of 75,000 gallons, the water system can significantly improve response times and effectiveness in emergency situations.

Understanding the capacity requirements for fire demand is crucial for water operators, as it helps in planning and preparing the water system for emergencies, ensuring compliance with safety standards, and protecting public health and property.