Figuring out the right number of trash cans for a new pedestrian mall is a blend of art and science. You want enough bins to prevent litter without cluttering the beautiful space. Here's a natural, step-by-step approach based on common municipal practices.
First, estimate peak foot traffic. How many people are expected to use the mall per hour on a busy Saturday? This is your foundational number. Next, consider the waste generation rate. A common benchmark is that a person in a public space generates about 0.05 to 0.1 liters of waste per hour. Simple math gives you a total waste volume estimate for peak periods.
Now, think about bin capacity and collection. Standard public bins often hold 120-240 liters. A key rule is never to let a bin exceed 80% capacity—it becomes unsightly and discourages use. If your peak period lasts 4 hours, and you expect 1000 people generating 0.075 L/hr each, that's 300 liters of waste. You'd need enough bin capacity to handle that 300 liters while staying under 80% full. With 200L bins, you'd need at least two bins (2 bins * 200L * 0.8 = 320L capacity).
Spacing is crucial. In high-footfall areas, place bins within a 30-meter visual range. People won't walk far to dispose of something. Place them near natural stopping points: bench clusters, food vendor queues, and transit entrances. Don't forget high-waste zones like food courts—they need dedicated, larger-capacity bins.
Finally, pilot and observe. Start with a slightly higher number based on your calculations—maybe one bin every 25 meters. Observe for a week. Are bins overflowing? Add more. Are some consistently empty? You might remove one. The goal is a clean mall where the bins are convenient but almost invisible, seamlessly supporting the public experience.