| _bottomLevel | Bottom level |
| _groundLevel | Ground level |
| _id | Node ID string. |
| _openBoundaryType | Type of open boundary. Check if node is an open boundary using InternalNode before accessing this property. |
| NodeListIndex | Index of this node in the list of nodes. Optimization for fast lookup in the lists (instead of using find). |
| Reaches | List of engineReaches connected to this node. |