| Area | Flow Area through the weir. |
| Discharge | Discharge in case of free overflow. |
| ExtensionData | Property used by (de)serializer, when it can not find proper target for a data field. Support of forward compatible data contracts. |
| HNeg | UpStream water level (compared to flow dir) in case of negative flow. |
| HPos | UpStream water level in case of positive flow. |
| HWeir | Water level at the weir. |
| Width | Flow Width through weir. |