Quick Answer
Concrete cisterns are the most durable option, lasting up to 50 years or more with proper maintenance, while steel and polyethylene cisterns can last 20-30 years. However, steel cisterns are more prone to rust and corrosion.
Choosing the Right Cistern Material
When it comes to constructing a cistern, the material you choose will have a significant impact on the structure’s lifespan. Concrete cisterns are a popular choice due to their durability and low maintenance requirements. A well-mixed concrete with a compressive strength of at least 3,000 pounds per square inch (psi) is recommended. This ensures the cistern can withstand water pressure and harsh environmental conditions.
Cistern Material Comparison
Steel cisterns are another option, but they require regular coating to prevent rust and corrosion. A 20-gauge steel cistern with a thickness of 1/16 inch is a good starting point. However, even with proper coating, steel cisterns may not last as long as concrete or polyethylene options. Polyethylene cisterns are a more recent innovation, offering a lightweight and corrosion-resistant alternative. They typically last 20-30 years, but may not be suitable for high-water-pressure applications.
Cistern Sizing and Design
Regardless of the material you choose, proper cistern sizing and design are crucial to ensure efficient water storage. A general rule of thumb is to size the cistern to hold at least 1,000 gallons of water for a family of four. The cistern should also be designed with a minimum of 12 inches of freeboard to allow for thermal expansion and sedimentation. Consider factors like rainfall collection, water usage, and potential evaporation when determining the ideal cistern size for your needs.
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