Stream debris restraining structure

A method for restraining debris in a stream, said method comprising providing a restraining structure comprising lateral walls which define wings extending from banks of the stream inwards and which delimit between them a flow section comprised in a bed of said stream, wherein said flow section includes an upper portion comprising a restraining structure, set between said lateral walls, for retaining material arriving from upstream and a lower portion defining a horizontal slit for outflow.

A structure for restraining debris in a stream comprising banks, the structure comprising lateral walls which define wings extending from the banks of the stream inwards and delimiting between them a flow section comprised in a bed of said stream, wherein said flow section includes an upper portion comprising a retaining structure, set between said lateral walls, for retaining material arriving from upstream and a lower portion defining a horizontal opening for outflow, the horizontal opening having a predetermined height between a bottom edge of the retaining structure and the stream bed, wherein the structure exerts an effect of lamination during a flood peak, wherein said predetermined height is selected as a function of a given maximum value of deposit upstream of the structure.