had been silting
Past perfect progressiveconjugation ofsilt.There are other translations for this conjugation.

silt

In 2014, the harbor authority found its south breakwater had shown serious foundation erosion, and the navigation channel also had been silting badly.
En 2014, la autoridad portuaria encontró que su rompeolas del sur había mostrado una grave erosión de los cimientos, y los sedimentos se acumularon gravemente en el canal de navegación.
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