Abstract: A levee, canal or aqueduct wall is internally supported by tensional members such as cables which stretch across the width of the waterway. In embodiments the tensional members may leave a space between the topmost member and the water level, so as to allow for passage of sea vessels above the cables. Vertical or horizontal struts or individual anchors attached to the ends of the cables may be positioned within, partially within or outside of the walls. Due to the strength of the device, the waterway wall may even be constructed at an angle to the vertical, even leaning outwards. External guying tensional members may be anchored and may connect to the wall or the internal tensional members to provide tensional support to prevent motion in the inward direction, either temporarily (such as during construction) or permanently.