History of Apron
| Element | Description | Element Code | Essential | Uniclass 2015 | Updates |
|---|---|---|---|---|---|
| Apron | The scour protection structure laid immediately downstream of a culvert | APN | No | 25-02-2020 | |
| 27-04-2021 | |||||
| Apron | The scour protection structure laid immediately upstream and/or downstream of a structure. | APN | No | SL_32_50_76 | 27-04-2021 |
| Apron | The scour protection structure laid immediately upstream and/or downstream of a structure. | APN | No | SL_32_50_76 | 11-04-2023 |