Observation

Welsh Harp. Cool Oak Lane, Hendon

Welsh Harp Reservoir

Reservoir

August 5, 2026 at 3:45 PM

QA status: Reviewed: quality check complete

Weather observations

  • Current weather

    Community scientist interpretation

    • Sunny
    • Cloudy
    • Windy
  • Current weather description

    Community scientist interpretation

    Warm weather

  • Weather in the past 24hrs

    Community scientist interpretation

    • Sunny
    • Cloudy
    • Windy

Qualitative readings

  • Clarity

    Community scientist interpretation

    Clear

  • Water use

    Community scientist interpretation

    Fishing, Swimming, Boating, Public water supply

  • Colour

    Community scientist interpretation

    Green, Yellow


Plants/wildlife

  • Algae

    Community scientist interpretation

    Evenly dispersed


Issue reporting

  • Odour

    Community scientist interpretation

    None

  • Pollution sources

    Community scientist interpretation

    Residential discharge, Urban/road discharge, Highway discharge

  • Water surface

    Community scientist interpretation

    Floating algae


Physical tests

  • Water flow

    Community scientist interpretation

    Steady

  • Water level

    Community scientist interpretation

    Average


Chemistry tests

  • Ammonia

    Hanna checker (ammonia - medium range)

    0.40 mg/L

  • Conductivity

    Other pen-type meter (conductivity)

    822 μS/cm

  • Turbidity

    Turbidity tube (45 cm)

    < 14 NTU

  • Water temperature

    Other thermometer

    24.1 °C

  • Phosphate

    Hanna checker (phosphate - low range)

    > 2.5 mg/L

  • Air temperature

    Other thermometer

    26.2 °C

  • Phosphate

    Hanna checker (phosphate - high range)

    3.0 mg/L


Notes

Sampled with Dianne Murphy. Welsh Harp SSSI Waterfow plentiful, human activity includes sailing canoeing, paddling etc. Well used No rain for over 6 weeks Levels of the reservoir are managed by the Canal & River Trust and sluice gates are opened and water enters into the Lower Brent