The containment facility was constructed in 2018 using two walls of steel sheet piling. Flownets may be used to estimate the quantity of seepage under dams and sheet piling. The island is protected by sheet piling measures at . A new steel sheet piling weir was constructed directly upstream from the existing weir. A thick brick wall was built against the waterproofed sheet piling in the basement. This sheet piling way raised the height of the dam again. Some of new channel was constructed, some of it edged with sheet piling. In the sub-basement, the sheet piling was plastered and then waterproofed with felt and tar.