Stream Channel Material Types
The code identifying the material of the channel (sand, gravel, silt, etc.)
United States Geological Survey, Surface Water User Group
| Code | Sort Order | Valid Flag | Name | Description |
|---|---|---|---|---|
| UNSP | 1 | true | Unspecified | The channel bed material was not specified. |
| SILT | 2 | true | silt-mud | The channel bed was composed of silt and/or mud. |
| SAND | 3 | true | sand | The channel bed was composed of sand. |
| GRVL | 4 | true | gravel | The channel bed was composed of gravel. |
| CBLS | 5 | true | cobbles | The channel bed was composed of cobbles. |
| BLDR | 6 | true | cobbles-boulders | The channel bed was composed of cobbles and/or boulders. |
| LDGE | 7 | true | bedrock-ledge-artificial | The channel bed was composed of bedrock, ledge or an artificial material like concrete or metal. |