Silting of the channels was another common problem, especially those aqueducts that drew water directly from rivers, such as Anio Novus, and numerous settling tanks (each one being known as a castellum) were built along their lengths.
Pendangkalan saluran adalah masalah lain yang umum, terutama saluran air yang mengambil air langsung dari sungai, seperti Anio Novus, dan berbagai tangki-tanki air yang tetap (masing-masing dikenal sebagai castellum) yang dibangun di sepanjang saluran air.