That's an excellent observation! You've correctly identified one of the primary reasons for those gaps between bench slats. Yes, drainage is absolutely crucial for outdoor benches exposed to the elements.
When rainwater collects on flat surfaces, it creates perfect conditions for rot, mold, and premature deterioration. The strategic spacing between slats allows water to pass through quickly rather than pooling on the seating surface. This simple design feature significantly extends the bench's lifespan by preventing water from being trapped against the wood or metal.
Beyond drainage, these gaps serve multiple practical purposes. They allow air circulation to help dry the surface faster after rainfall. The spaces also make benches easier to clean since debris like leaves and dirt can fall through rather than accumulating. Additionally, during winter months, snow and ice have less surface area to cling to, making removal simpler.
The gap size is carefully calculated - too wide would be uncomfortable for seating, while too narrow would compromise drainage efficiency. Next time you see these engineered spaces, you'll appreciate how this clever design combines practicality with comfort, ensuring public benches remain functional and durable through countless weather cycles.