After the flooding, Darlow has now frozen around much of the perimeter, but we’ve kept monitoring the water chemistry due to the chance of increase levels of ammonia, nitrates, nitrites and phosphates coming in in flood water.
The good news is that these troublesome chemicals have remained low; ammonia is undetectable, but phosphate (0.1 mg/L), nitrite (0.025 mg/L) and nitrate (0.12 mg/L) have entered the lake in the flood water from the river via Brasenose and 0.12 mg/L, respectively). Nitrates are still 20x less than our algal bloom in 2021, so it is something to keep an eye on, but not harmful as it stands, especially with such low temperatures (2.5 °C). Oxygen levels are also high.
More detail here.
