Graph of pre-processing for water pixel extraction

Is this preprocessing graph a correct one? I am extracting the water spread area of a reservoir from standard sentinel images.

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I think the following processing flowchart could be good start for water spread area

Source : https://www.isprs-ann-photogramm-remote-sens-spatial-inf-sci.net/IV-5/151/2018/isprs-annals-IV-5-151-2018.pdf

The following work also could be good assistance for water body destinations,
A Method for Automatic and Rapid Mapping of Water Surfaces from Sentinel-1 Imagery

Source: https://www.mdpi.com/2072-4292/10/2/217

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