Abstract: A cylindrical upstanding water tank is formed from a plurality of rows of corrugated curved panels bolted edge to edge with a liner extending over the cylindrical wall and support surface to contain the water within the tank. An access opening is formed in one panel of the cylindrical wall and includes a frame with a rectangular planar front flange and a rearwardly extending flange welded into the hole. Liner retention straps surround the hole to fasten an edge of the liner around the hole. An access cover plate is bolted to the front flange of the frame and carries a hoop strength plate which fastens to studs at the rear of the plane so that the plates are removable to allow service access to the interior of the tank.

Abstract: A liquid containment barrier is formed by corrugated panels connected end to end and supported by upstanding brackets at spaced positions around the peripheral wall and a liner attached to the wall. Each panel has the top edge as a raw edge with a plurality of elongate extruded plastics spring channel members engaged over the top edge. A plurality of additional clamp collars are arranged to surround a part cylindrical portion of the channel members to bridge between panels and to form a local clamping force on the channel member. Each bracket has an inner vertical edge engaging the panels and a rod member hooked to the brace at the lower end and engaging over the channel members at the upper end. The bracket also includes an upwardly extending flange parallel to the inner edge to form a channel for the bottom edge of the panel.