Later, at approximately 10 weeks of prenatal development, these cords are canalized and form ducts, with the largest becoming the parotid duct for the parotid gland.
To provide the 28 hydroelectric power plants with enough water power the rivers water is diverted several times and almost the whole river was canalized.
This has resulted in the river being straightened and canalized between ramparts of dredge material making access to the river difficult and compromising its value as a public amenity.