How many portable toilets does a Nashville event need?

Why is there no single number for Nashville?

The Metro material on events sets out the permit and the plan but does not give a units-per-person figure, so the count is a judgment for each event.

Events differ widely. A downtown festival with alcohol, a park concert on a lawn and a short street fair are three different problems, and a single ratio would be wrong for at least two of them.

Because no figure is published, this page does not give one, and a page that did would be repeating a number it cannot attribute to a Metro rule. The count is reached by reasoning and then checked against the plan.

That reasoning should be written into the plan, with the headcount, the hours, the food and the alcohol, so a reviewer can see the logic behind the figure.

What inputs set the count?

Four things set the count in practice: expected peak headcount, the hours of the event, whether food is served, and whether alcohol is served. The table shows how each one moves the figure.

The peak headcount matters more than the total attendance. A crowd of several thousand over a full day does not all arrive at once, so the count is set for the busiest hour, and servicing keeps up with the rest of the day.

Hours matter because use accumulates. A four-hour event and a twelve-hour event with the same peak need different servicing, and the longer one usually needs more units to stay clean between visits.

Alcohol and food both raise use. An event that serves them should expect more visits and a higher count than the same crowd without them.

How should the units be split across the grounds?

Split the count into clusters that match the flow of the crowd, with one cluster at each main stop, rather than one block at the entrance.

A cluster at the gate is easy to plan but leaves the far end of the grounds without a unit close by. Each stage, food area and gate draws people, so each gets a cluster sized for the people who stop there.

Metro's application sets an accessible share for portable toilets at an event, rounded up. That share is applied within the provision, and the accessible units are spread across the grounds rather than placed in one group.

The layout map should show each cluster, its count and the accessible units, so the reviewer and the stewards can find the nearest unit from any point.

• One cluster at each main gate
• One cluster beside each stage or viewing area
• One cluster at each food area, with a handwash station
• Accessible units spread across the grounds
• Extra units at the far end of long grounds

How does the count change for a long or hot day?

A long or hot day needs more frequent servicing and sometimes a few extra units. Adding units alone does not fix a slow schedule, so the servicing plan is set with the count.

Heat speeds the rate at which units fill and become unpleasant. The plan should set extra visits for the hottest part of the day, and the provider should be told the expected hours and temperature.

A long event with an evening peak needs the units lit and checked before dark. The visit before the evening crowd is the one most often missed, so it belongs in the schedule.

Spare units held back for a surge are a reasonable choice for a large event, and the spare count is part of the plan the reviewer sees.

What goes in the permit file?

The file should show the count, its reasoning, the layout map, the accessible units, the servicing plan and the insurance certificate where a Metro park is used.

Metro's permit page says a special event permit is generally required for an event with street closures, sales, large tents or portable toilets for public use. The Office of Film and Special Events handles permitting for events in Davidson County.

The layout map shows portable toilets, tents, ramps and companion seating, as the application asks. The restroom units belong on that map with their counts.

The provider supplies the unit details, the placement sketch and the servicing schedule. The organizer files the whole plan with the application.

How do you check the count after the event?

Compare the servicing log with the planned count. Where units were overwhelmed, record the reasons so the next plan starts from evidence rather than memory.

The check looks at the times units were full, the visits that were late and the clusters that drew the most use. A cluster that ran short is the clearest lesson for the next count.

A short written note goes into the event file, which helps the next organizer and answers questions if the event is held again.

How do you plan for a crowd that is hard to predict?

Plan for a range rather than a single number, set the count for the upper end at the busiest cluster, and agree a fast way to add units during the event.

Past attendance, the venue's capacity and the time of year are the best starting points. Where none is known, the plan should say so and show how the count would change.

A standby arrangement with the provider, with a call-out for extra units or an extra visit, is a practical answer to an uncertain crowd, and it is written into the plan.

What if the event spans more than one space?

Each space is counted on its own, with its own clusters and its own accessible units, and the total is the sum of the spaces. The permit for each space is checked against its own route.

A festival that uses a park and a closed street has two counts and two permit routes. The plan should show both and keep them distinct.

A crowd that moves between spaces should be planned for the walk between them, so no cluster is left without a nearby alternative.

How is the count checked against the venue?

Where the event is held at a venue with its own facilities, the count for the grounds is set separately from the venue's own provision, and the plan says which facilities are counted.

Venue facilities serve the people inside the gates, and the grounds count serves the people outside. Stating which is which keeps the arithmetic honest.

A venue's own provision is not a reason to reduce the grounds count without a check on how many of its facilities are open to the public on the day.