Translate the following English sentence to French:
"The focal point of this directive, in which water is considered as a whole, a total flow, with no distinction between surface and groundwater, which is the mistake that was made for a long time, is the right focal point and implies a step forward."
L' optique de cette directive, qui envisage l' eau comme un tout, un flux total, sans faire de distinction entre les eaux de surface et souterraines, erreur que l'on a longtemps commise, est l' optique adéquate à adopter et suppose un pas en avant.