Location

Welsh Harp. Cool Oak Lane, Hendon

Welsh Harp Reservoir

Welsh Harp Reservoir in England

Dataset summary

Welsh Harp. Cool Oak Lane, Hendon has data for current_weather, current_weather_description, previous_weather, clarity, water_use, colour, algae, odour, pollution_sources, on_the_water_s_surface, water_flow, water_level, ammonia, conductivity, turbidity, water_temperature, phosphates, and air_temperature from 5 August 2026 to 5 August 2026.

51.574918, -0.242657

Summary of quantitative results

Guidelines for exceedances are based on: United Kingdom

  • Chemistry tests

    • Ammonia

      Hanna checker (ammonia - medium range)

      0.4mg/L

      Latest

      0.4mg/L

      Average

      Not enough data for trend yet

      Trendlines will appear once >3 datapoints are entered.

    • Water temperature

      Other thermometer

      24.1°C

      Latest

      24.1°C

      Average

      Not enough data for trend yet

      Trendlines will appear once >3 datapoints are entered.

    • Turbidity

      Turbidity tube (45 cm)

      14.0NTU

      Latest

      14.0NTU

      Average

      Not enough data for trend yet

      Trendlines will appear once >3 datapoints are entered.

    • Conductivity

      Other pen-type meter (conductivity)

      822.0μS/cm

      Latest

      822.0μS/cm

      Average

      Not enough data for trend yet

      Trendlines will appear once >3 datapoints are entered.

    • Air temperature

      Other thermometer

      26.2°C

      Latest

      26.2°C

      Average

      Not enough data for trend yet

      Trendlines will appear once >3 datapoints are entered.

    • Phosphate

      Hanna checker (phosphate - low range)

      2.5mg/L

      Latest

      2.5mg/L

      Average

      Not enough data for trend yet

      Trendlines will appear once >3 datapoints are entered.

    • Phosphate

      Hanna checker (phosphate - high range)

      3.0mg/L

      Latest

      3.0mg/L

      Average

      Not enough data for trend yet

      Trendlines will appear once >3 datapoints are entered.

View observation list ›

About this location

  • Water body type Reservoir
  • Dataset Brent Catchment Water Quality Working Group, Thames21
  • Monitoring purpose Investigative
  • Data collector Judith Howlett
  • Land use Urban residential, Urban park, Forest, Grassland shrub
  • Bank vegetation Trees and shrubs, Grass
  • Location description Footbridge over the Welsh Harp Monitoring location as Silk Stream & Upper Brent runs into the Harp amongst others runs into the Welsh Harp
Reference photo taken August 05, 2026