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Reference WATERBASE - Rivers: chemical quality data
Chemicals table - this table contains data on chemical quality measured at the EUROWATERNET river monitoring stations. Chemical and Station data can be linked using the WB_ID.
| 90_ILE | 90th Percentile concentration over aggregation period | float(8) | 0 | |
| DETERMINAND | Determinand name | As defined in Metadata section | nvarchar(30) | 0 |
| MINIMUM | Minimum concentration over aggregation period | float(8) | 0 | |
| REMARKS | Remarks | nvarchar(100) | 0 | |
| MAXIMUM | Maximum concentration over aggregation period | float(8) | 0 | |
| PERIOD_ LNGTH | Period Length | Number of months in aggregation period | int(4) | 0 |
| PERIOD | Period of aggregation | Annual = aggregated over whole year, Summer = aggregated over summer months, Winter = aggregated over winter months | nvarchar(10) | 0 |
| DET_LMT | Limit of Detection | Note: Concentration for which there is a desirably small probability that the determinand will not be detected (usually detected with 95% confidence) | float(8) | 0 |
| DATA_SRC | Data Source | nvarchar(20) | 0 | |
| WB_ID | WATERBASE ID | Unique WATERBASE identifier, representing EUROWATERNET station | int(4) | 0 |
| 10_ILE | 10th Percentile concentration over aggregation period | float(8) | 0 | |
| YEAR | Year of measurements | range 1965-2001 (actual time series depends on country and determinand) | int(4) | 0 |
| UNITS | Unit of measurement | As defined in Metadata section | nvarchar(30) | 0 |
| STDV | Standard Deviation of concentration over aggregation period | float(8) | 0 | |
| MEDIAN | Median concentration over aggregation period | float(8) | 0 | |
| AVERAGE | Average concentration over aggregation period | float(8) | 0 | |
| NO_SAMPLES | Number of Samples in aggregation period | int(4) | 0 |
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