What is the most economical way to protect an elevated water tank from the damaging effects of corrosion?

Cathodic protection is the most economical approach to protect an elevated water tank from corrosion because it involves a method where an electrical current is used to counteract the electrochemical processes that cause corrosion. This technique is particularly effective for large structures like water tanks, where other methods may be less cost-effective over time.

By placing a sacrificial anode—usually made from a more reactive metal—near the structure, it effectively diverts corrosion away from the tank. This can result in lower long-term maintenance costs compared to methods that may require more frequent application or replacement, such as painting.

While other methods, such as galvanization, applying anti-corrosive paint, and using stainless steel, also provide protection against corrosion, they often incur higher upfront costs or may require periodic maintenance or replacement, which can add to their long-term expense. Cathodic protection, therefore, not only addresses the immediate need for corrosion prevention but also represents a more sustainable and economically viable solution over time.