That's an excellent and very practical question! For a standard one-block city park, a good starting point is 3-4 outdoor trash bins. This isn't a one-size-fits-all answer, though. The perfect number depends on several key factors.
First, consider the park's layout and features. Place bins at natural gathering points: near the entrance, close to any benches or seating areas, beside a playground (if present), and around a sports court or picnic tables. High-traffic zones always need coverage.
Next, think about capacity and maintenance. It's better to have fewer, larger bins that are emptied regularly than many small bins that overflow. Overflowing bins are the biggest culprit for litter. Coordinate with your local public works department to establish a reliable collection schedule, especially during peak seasons and after weekends.
Finally, observe and adapt. After installing your initial set, watch how park visitors behave. Are people leaving trash on benches near a barren area? That's a sign you need another bin. The goal is to make disposal convenient and instinctive, which keeps the park clean and enjoyable for everyone.
In short, begin with 3-4 well-placed, adequately sized bins and maintain them diligently. Your park's specific usage patterns will give you the best clues for any final adjustments.