Example figures: Frequency for the underflow of water level threshold values

Explanations

Frequency [0.0,1.0] for which the water level underflows a given threshold within the period of data analysis.

• left top: result for threshold -1.875 m.
• right top: result for threshold -0.875 m.
• left bottom: result for threshold 0.125 m.
• right bottom: result for threshold 1.125 m.

Please notice that frequency cannot reach a value of 1.0 in temporarily dry areas (e.g. tidal flats).

Examples

water levels below -1.875 m	water levels below -0.875 m

water levels below 0.125 m	water levels below 1.125 m

Closely related quantities

• frequency for the exceedance of water level threshold values
• duration of low water

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