That's an excellent and practical question for maintaining a clean and welcoming public space. For a small urban park, I typically recommend trash bins with a capacity in the range of 30 to 50 gallons (approximately 115 to 190 liters). This size strikes the perfect balance for most neighborhood parks.
Here’s my reasoning, based on managing urban spaces: A 30-gallon bin is often sufficient for a very compact park with just a couple of benches. However, opting for a 50-gallon bin provides more flexibility and is usually the safer choice. It can handle the waste from a modest playground area, a few picnic spots, and pedestrian pathways without needing constant emptying. The key goal is to prevent overflow, which is the main cause of litter scattering and pest issues.
Frequency of service is crucial. If your park maintenance team empties bins daily, a 30-gallon bin might be adequate. If collection is less frequent, like every other day, the larger 50-gallon capacity becomes essential. Always consider placing bins in high-traffic "generation points" – near entrances, benches, and playgrounds – rather than spacing them evenly. Using two 30-gallon bins in two key locations is often more effective than one large bin in a low-traffic spot.
Finally, I strongly suggest bins with secure, hinged lids to deter animals and minimize odors. Durable, weather-resistant materials like coated steel or heavy-duty plastic are must-haves for longevity. Starting with a 50-gallon capacity at main points allows for growth in park usage and is a proactive step toward sustainable urban cleanliness.