Quick Answer
In snowy regions, a cistern should be buried to a depth of at least 3 to 4 feet below the frost line to prevent damage from freezing temperatures and shifting ground. This depth also helps to protect the cistern from potential water table fluctuations. Proper burial depth is crucial for a cistern's longevity.
Choosing the Right Depth
When burying a cistern, it’s essential to consider the local climate, soil type, and water table depth. In areas with permafrost or frequent freezing temperatures, a deeper burial is often necessary to prevent damage. A general rule of thumb is to bury the cistern at least 3 to 4 feet below the frost line, which is the depth below which the ground freezes during winter. In regions with a shallow frost line, a cistern may need to be buried as deep as 6 to 8 feet.
Concrete Cistern Burial Techniques
To ensure a stable and secure burial, a concrete cistern should be buried in a trench that is at least 12 to 18 inches wider than the cistern itself. The trench should be filled with compacted gravel or aggregate material to allow for proper drainage and water flow. The cistern itself should be placed in the center of the trench, and the surrounding material should be compacted to prevent settling or shifting. A concrete slab or pad can be poured over the top of the cistern to provide additional protection and support.
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