Quick Answer
Cistern placement locations should be on high ground with good drainage to prevent water accumulation and contamination. Sloping or slightly elevated areas with minimal shade are ideal. This reduces the risk of flooding and minimizes the need for pumps.
Site Selection Criteria
When choosing a location for a buried concrete cistern, consider the water table level and the natural slope of the land. A site with a high water table can lead to water seepage into the cistern, while a location with poor drainage may cause water to accumulate and contaminate the stored water. Look for areas with a gentle slope or elevation to ensure proper water flow.
Soil and Ground Conditions
The type of soil and ground conditions are crucial when burying a concrete cistern. A stable and compact soil with minimal settling or shifting is essential to prevent cistern damage or collapse. A 6-inch thick layer of compacted gravel at the bottom of the cistern and a similar layer around the perimeter can help with water drainage and reduce settlement risks. This also helps to prevent water from seeping into the surrounding soil.
Cistern Depth and Size Considerations
When determining the depth and size of the cistern, consider the amount of rainfall and the water usage requirements. A general rule of thumb is to have a minimum of 1,000 gallons of storage per household user. The cistern should be buried to at least 6 inches below the surrounding grade to prevent water from accumulating around the base. A minimum depth of 8-10 feet is recommended to allow for adequate water storage and to prevent freezing in colder climates.
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