Division Averaging periods and reference conditions for emissions to water
United Kingdom
Unless stated otherwise, emission levels associated with the best available techniques (BAT-AELs) for emissions to water given in these BAT conclusions refer to values of concentration (mass of emitted substances per volume of water) expressed in mg/l.
Unless stated otherwise, the averaging periods associated with the BAT-AELs are defined as follows:
| Daily average | Average over a sampling period of 24 hours taken as a flow-proportional composite sample or, provided that sufficient flow stability is demonstrated, from a time-proportional sample |
| Yearly/Monthly average | Average of all daily averages obtained within a year/month, weighted according to the daily flows |