Storages are points describing any type of storage capacity, which can for example be a reservoir, a lake or a pond.
A storage can be defined anywhere on the map, and is connected to a branch using a storage connection. In the current version, a storage can only be connected to a branch end.
Note: A storage can be connected to multiple branches. A branch can however support only one connection at each end, and it is therefore not possible to connect two storages to the same branch end.