Logistics of Supporting a True City

Logistics of Supporting a True City outline what is needed to feed and support a True City.

Requirements
A Tier 1 True City has Approximately 100.000 Inhabitants.

An adult person that is moderately active needs about 1kg of wheat worth of calories per day to survive. As other nutrients are also required, this only reflects the bare minimum to survive.

As such, a True City needs 100 metric tons of wheat per day, or 36.500 tons per year. This leaves no room for error and is the bare minimum.

Wheat has a volume of 0.75 m³ per ton. Meaning 133.3 m³ per day or 48.666 m³ per year.

Shipping Capacity
A typical longship measures ~25 metres long and 2.5 metres high according to wikipedia.

Assuming the ship can only be filled to 1.5 metres height, and only 30% of the remaining volume is available due to crew requirements, means 37 tons of wheat transported in one go.

This means that one longship can transport enough wheat to feed ~37.000 people for a day.

3 Longships a day could sustain a T1 City.

As a single supply disruption means famine, you would, of course, want more, along with the other foods needed to keep the population healthy, like olives and olive oil, fish and veal, dried fruit, vegetables and of course all the non-food harbor traffic going on.

Bigger ships aren't strictly speaking necessary, but they are certainly more economical. for bulk shipping across the Yllthon Sea. Longships meanwhile are able to go anywhere there is a river connection.