Councils, Engineers and Designers

A growing body of evidence is identifying plastic pipes as the sustainable choice for development — now and in the future. Plastic piping systems are strong, durable, light-weight and flexible, requiring significantly less energy to fabricate, transport and install than either the metal or concrete alternatives....

The role of instream culverts in fish passage in New Zealand Poorly designed instream structures (including culverts, weirs and dams) are a significant contributing factor in the declining populations of New Zealand’s native freshwater fish. According to DOC, about 70% of New Zealand’s native fish are threatened...