Quick Answer
It's not necessarily better to dig a deeper pit for water collection. In fact, the optimal depth for a water collection pit depends on various factors, including the water table level, soil type, and the desired volume of water.
Pit Depth Considerations
When designing a water collection pit for a solar still, it’s essential to consider the water table level. If the water table is far below the surface, digging a deeper pit may be necessary to reach the water. However, if the water table is high, a shallow pit may be sufficient. A general rule of thumb is to dig a pit at least 1-2 feet (30-60 cm) deeper than the surrounding soil to ensure a stable water table.
Water Collection Pit Design
A well-designed water collection pit should have a diameter of at least 3-4 feet (90-120 cm) to allow for adequate water storage and to prevent the pit from becoming too narrow. The pit should also have a slight incline or slope to facilitate water flow and to prevent sediment from accumulating. A recommended slope is 1:10, meaning for every 10 feet of pit depth, the diameter should increase by 1 foot.
Solar Still Construction
When constructing a solar still, it’s crucial to place the collection pit at a lower elevation than the evaporation surface to allow for gravity-driven water flow. The pit should be designed to collect and store water, but not to the point where it becomes too deep or difficult to access. A general rule of thumb is to limit the pit depth to 3-5 feet (90-150 cm) to ensure easy access and maintenance.
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