Accretion

But it must be stressed that accretion as a mode of acquiring property under Article 457 of the Civil Code requires the concurrence of the following requisites: (1) that the deposition of soil or sediment be gradual and imperceptible; (2) that it be the result of the action of the waters of the river; and (3) that the land where accretion takes place is adjacent to the banks of rivers. (New Regent v. Tanjuatco, G.R. No. 168800, April 16, 2009)