Observation

Whetstone Stray

Dollis Brook

River or stream

View trends at this location

January 14, 2026 at 10:10 AM

QA status: Needs review

This observation is under review by Water Rangers, last updated on 2026-01-21, and has not been marked as checked yet. Details are below.

Review needed: Based on previous readings, conductivity's result of 380μS/cm is outside the expected range of 756.28-889.72μS/cm.

Weather observations

  • Current weather description

    Community scientist interpretation

    Frosty morning

  • Weather in the past 24hrs description

    Community scientist interpretation

    A fair amount of rainfall past 24 hours. frost overnight

  • Current weather

    Community scientist interpretation

    • Sunny

  • Weather in the past 24hrs

    Community scientist interpretation

    • Cloudy
    • Rainy

Qualitative readings

  • Clarity

    Community scientist interpretation

    Cloudy

  • Water flow

    Community scientist interpretation

    Steady

  • Water level

    Community scientist interpretation

    High

  • Algae

    Community scientist interpretation

    None

  • Odour

    Community scientist interpretation

    None

  • Pollution sources

    Community scientist interpretation

    Residential discharge, Urban/road discharge

  • Water use

    Community scientist interpretation

    Other

  • Colour

    Community scientist interpretation

    Brown

  • Water surface

    Community scientist interpretation

    None

Chemistry tests

  • Ammonia

    mg/L

    Hanna checker (ammonia - medium range)

    0.12

  • Conductivity

    μS/cm

    Other pen-type meter (conductivity)

    380

  • Turbidity

    NTU

    Turbidity tube (45 cm)

    25

  • Water temperature

    °C

    Other thermometer

    5.8

  • Phosphates

    mg/L

    Hanna checker (phosphates - low range)

    0.73

  • Air temperature

    °C

    Other thermometer

    3.0

Recent photos

View more photos ›

Notes

Change in water colour normal after rainfall

Location description
Upper Brent Catchment Footbridge over the Brook