Recordings

Water was passed slowly through a 6mm inner diameter tube hanging 1750mm from the surface of the water. The water depth was 150mm in a standard bucket of height 200mm, diameter 260mm.

Sounds

Taken from a single recording, with only intermediate silences removed. They are quiet, so turn up your volume.

The sounds are remarkably similar. Note the strong background noise from the recording computer. The dominant frequencies of this noise are roughly:

Dominant frequencies of contaminating noise
Relative MagnitudeFrequency (Hz)
0.3174516
0.3169344
0.2407172
0.1250689

Notes

Spectrogram

All the spectrograms look the same, modulo some noise. Spectrogram of A01