The Dump is used to store goods, in addition to the Warehouses. For every level of the Dump, you gain 32,000 additional storage capacity for each resource.
A Warehouse adds an additional 8,000 resourceper level storage capacity, that is configured separately from this chart.
The Town hall adds an additional 1,500 and 1,500 each luxury good (other) storage capacity that is figured separately in this chart.
When a stored resource reaches 75% of the maximum allowed, the amount appears red. When the amount reaches 100%, the amount appears bold red. Any amount received beyond maximum is lost. To increase storage capacity, upgrade your Warehouse (or build another one).
You can double the amount of resources stored by the Warehouse, the Dump and the Town hall for 7 days by spending 24 .
Same as with Warehouse: When placing goods for sale in your Trading post, capacity is subtracted from the total available to your city. This will be reflected in the tool-tip shown when you hover on your resource totals. Any resources in your Trading post will not show up in the Warehouse or Dump screen and may take you over the "Safe" limit, so watch out. The resources "hidden" in the Trading post are susceptible of being pillaged.