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1. headLevel: is the upstream level of water in the river measured from the top of the crest at the bottom of the V.
2. tailLevel: is the downstream level of water in the river measured from the top of the crest at the bottom of the V and can be positive or negative.
3. type: type can be 'simple' or 'crest_tapping'. With 'crest_tapping' the pressure tapping measurements are taken and used for the flow calculation.

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