Turbidity Barrier, Baffle Curtain, Cromwell WWTP, Cromwell, Otago, New Zealand. Contract Completion November 2008. Contract’s Scope: A single 100 m long, 1.3 m deep baffle curtain, fabricated from Permaliner 750 was fabricated and installed at Cromwell WWTP. The baffle had 150 mm floating element, made from marine grade polystyrene, weld-sealed inside low density polyethylene tube and inserted in weld-sealed buoyancy element, fabricated from Permaliner 750. Cross-anchors (side anchors) installed from both sides of the baffle curtains every 20 m.