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| Element | Description | Element Code | Essential | Uniclass 2015 |
|---|---|---|---|---|
| Pre-Barrage | An ancillary structure to a primary structure, for example a Fish Pass asset or Weir asset. A pre-barrage is a small cross channel structure that is placed downstream of a structure to cause water to back up and flood the downstream end of a potential obstruction, thus improving hydraulic conditions and acting to facilitate entry into and passage through a structure. | PBR | No | SL_32_85_65 |