Urban planter boxes typically incorporate one of several key drainage systems to ensure plant health and prevent waterlogging. The most common is the simple drainage hole system, where holes at the container's base allow excess water to escape directly. More advanced solutions include integrated self-watering or sub-irrigation systems. These feature a built-in water reservoir at the bottom, separated from the soil by a platform. A wicking mechanism draws moisture upward to the roots as needed, while an overflow hole prevents the reservoir from overfilling. Many modern designs also include a capillary matting layer or a gravel base to improve drainage efficiency and aeration. Proper drainage is crucial for preventing root rot and maintaining optimal soil conditions in confined urban spaces.
What kind of drainage system do these urban planter boxes have?
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