Summary of quantitative results
Guidelines for exceedances are based on:
United Kingdom
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Chemistry tests
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Folly Brook/Dollis Brook in Barnet
Darlands Lake (Upstream) has data for colour, clarity, water_flow, water_level, ammonia, conductivity, turbidity, water_temperature, phosphates, air_temperature, current_weather, previous_weather, algae, odour, current_weather_description, on_the_water_s_surface, and previous_weather_description from 21 May 2023 to 24 November 2025.