Sample

Season

Year

Day of year

Date

Hydrological conditions

Calibration

Summer

1998

221 - 227

9 August-15 August

Rapid decrease in air and water temperatures

Calibration

Spring

1999

132 - 138

12 May-18 May

Gradual increase in air and water temperatures

Validation

Autumn

2006

292 - 298

19 October-25 October

Autumn conditions

Validation

Summer

2007

203 - 209

22 July-29 July

Warm air temperature conditions