What is the capacity of the collector tank?

• A. 50 gallons
• B. 40 gallons
• C. 60 gallons
• D. 100 gallons

Answer: (A)

Capacity is about how much fluid the tank can hold in total. For this collector tank, the specified storage is fifty gallons, which means when the tank is full it contains fifty gallons of water. That size is chosen to balance having enough storage to meet the system’s needs without overflow, while keeping the tank and its pump equipment compact and cost-effective. If the capacity were smaller, like forty gallons, heavy rainfall or longer storage periods could lead to overflow or more frequent cycling. If it were larger, such as sixty or a hundred gallons, you’d need bigger hardware and more space, which isn’t necessary for this setup. So fifty gallons best fits the intended design and operation.