Observation

Northleigh Road Bridge

Offwell Brook

River or stream

July 7, 2026 at 12:20 PM

QA status: Reviewed: quality check complete

Weather observations

  • Current weather

    Community scientist interpretation

    • Sunny
  • Rain in previous 24 hours

    Community scientist interpretation

    None


Qualitative readings

  • Colour

    Community scientist interpretation

    Brown, Water clear but with a brown hue (see photo)

  • Clarity

    Community scientist interpretation

    Clear


Plants/wildlife

  • Aquatic vegetation

    Community scientist interpretation

    Submerged (fully under the water) Absent
    Plants floating on the surface Absent
    Plants emerging out of the water Absent
    Algae (crusts or thin mats) Less than 5%
    Algae (thick mats, can be free floating) Absent
  • Vegetation on shore or riverbank

    Community scientist interpretation

    Scrub or shrubs (woody stems), Saplings, Mature trees

  • Problem plant species spotted during survey (UK)

    Community scientist interpretation

    Himalayan balsam

  • Wildlife spotted during survey (UK)

    Community scientist interpretation

    Chiff chaff


Issue reporting

  • Evidence of recent pollution

    Community scientist interpretation

    Livestock with direct water access Small amount
    Other Livestock grazing to water edge on upstream side but incised bank so access limited. Not sure of the situation further up the field.
  • Outfalls, pipes and drains

    Community scientist interpretation

    No outfall observed


Physical tests

  • Estimated width at water level

    Community scientist estimate (width)

    7 m

  • Estimated average water depth

    Community scientist estimate (depth)

    0.75 m

  • Water level

    Community scientist interpretation

    Average

  • Water flow

    Community scientist interpretation

    Steady

  • Natural obstacles to fish or flow

    Community scientist interpretation

    None

  • Channel bed materials

    Community scientist interpretation

    Gravel - pebble


Chemistry tests

  • Water temperature

    HM Digital COM-100 multimeter (temperature)

    18.4 °C

  • Conductivity

    HM Digital COM-100 multimeter (conductivity)

    393 μS/cm

  • Turbidity

    Turbidity tube (50 cm)

    < 12 NTU

  • Phosphate

    Hanna checker (phosphate - low range)

    0.29 mg/L

  • Nitrate

    WaterWorks Nitrate/Nitrite Test Strips (nitrate-nitrogen)

    2 mg/L

  • Nitrite

    WaterWorks Nitrate/Nitrite Test Strips (nitrite-nitrogen)

    ≤ 0 mg/L

  • Ammonia

    Simplex Health teststrip (ammonia-nitrogen - low range)

    ≤ 0 mg/L


Notes

Sampling on downstream side of bridge. Livestock are on the upstream side