Informative water layer, determined by attenuation depth, in water bodies of different turbidity

By using values of vertical diffuse attenuation coefficient at certain visible wavelength (or its mean value for some spectral region) we can estimate the depth of informative to remote sensing water layer sometimes called penetration depth, but more often attenuation depth. This value is an important parameter because about ninety percent of the information detected by optical remote sensing instruments is related to the sea layer with this depth.