1. The natural bed or channel of a continuous or discontinuous stream is the land covered by water during the maximum ordinary floods. 2. A hollow in the ground, natural or artificial, through which the water flows.
Fuente: 1. Real Decreto Legislativo 1/2001, por el que se aprueba el texto refundido de la Ley de Aguas 2. Glosario de términos. Instituto Geográfico Nacional