Type: Pressure Sensor Keller DCX-4.0, SN 1467

This instrument is based on differential pressure measurement of two

absolute sensors. The sensors measure pressure and temperature.

Height of V-notch above sensor: -0.0015m.

Datasets with correction contain the corrected discharge observed at the Vnotch.

The discharge is calculated as Q=Cd*h^2.5

After correcting the logger measurements with hand measured depths we interpolated the difference (dH)

Then we determined the factor Cd with discharge measurements which we also interpolated

The timing of hand measurements can be corrected to better represent the logged values

The last corrections (variable "clean_corr") were made for blocking of the V-notch weir as folows:

z1 represents the last good discharge value after which sedimentation slowly starts blocking the weir

z2 represents the moment when the blocking is max

z3 represents the moment just before cleaning of the weir

z4 represents the moment after cleaning of the weir

The max difference in discharge is Q(z3)-Q(z4)