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Plastic Inputs to Lake Rotorua: An Initial Assessment of Stormwater Stream Plastic Loads and Capture Devices
Summary
Researchers studied stormwater drains flowing into Lake Rotorua in New Zealand and found they're carrying real amounts of plastic waste—nearly 6 kg collected in just five sampling trips—much of which was too degraded to even identify what it originally was. This matters because that lake is a source of drinking water and recreation, and as plastic breaks down further it can turn into microplastics that are harder to remove and more likely to enter the food chain; the good news is the study identifies simple barrier-style devices (like floating booms) that cities could install in drains to catch this trash before it reaches the lake.
Plastics are a known but inconsistently researched challenge to Aotearoa New Zealand's inland freshwater systems. Understanding plastic origins, movement, and removal options for individual water bodies can enhance management efforts. This exploratory study quantified meso‐ and macroplastics entering Lake Rotorua through stormwater streams and assessed suitability of in‐stream capture devices. Plastic samples were collected and analysed over five sampling events at seven Rotorua city stormwater sites. Of the 306 samples (5982 g total), 51 were made of recyclable polymers, 124 were nonrecyclable and 131 were unidentifiable (e.g., degraded). Significant differences (ANOVA) were observed between the sample counts and weights of some sites (e.g., Depot Street and Headwater). With plastics present in the stormwater streams, capture devices are one option for collecting and removing pollution. A literature review was conducted to ascertain what aquatic‐based devices are being used globally and which are suitable for the stormwater streams. Six Rotorua‐based criteria (e.g., suitability in narrow or shallow channels) identified booms and boom‐receptable devices as recommended for trialling. Study findings can support reassessment of ongoing initiatives in Rotorua city and guide further scientific research. These insights can also be applied to meso‐ and macroplastic pollution in lakes with similar urbanised catchments.