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Water Level Easing
Easing — down from 44.57 at 02:00, now 44.55
44.55

Ray Farm

Groundwater Level 💧 Groundwater
Thames from Hurley to Teddington catchment • Marlow • Buckinghamshire • ID: SU89_82 • Level
(2h ago) • 1 reading/hr • 118 views

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Not an emergency service — if in danger call 999. Alerts rely on EA/SEPA/NRW data and are best-efforts. Terms

Current Level
44.545 mAOD
▼ Easing
24h Max
44.627 mAOD
24h Min
44.545 mAOD
Typical Range
43.08 - 55.00
mAOD
Highest Recorded
56.38 mAOD
EA official record
55.34 in our data (since Mar 2017)
🚽 Sewage overflows nearby

Recent Water Levels

🌍 floodradar.co.uk
1 day

Recent Readings

Falling · -2 cm over 19h
10 Oct 08:00 ▬ steady 44.545 mAOD
10 Oct 07:00 ▼ -0.2 cm 44.545 mAOD
10 Oct 06:00 ▬ steady 44.547 mAOD
10 Oct 05:00 ▼ -0.1 cm 44.547 mAOD
10 Oct 04:00 ▬ steady 44.548 mAOD
10 Oct 03:00 ▬ steady 44.549 mAOD
10 Oct 02:00 ▼ -0.2 cm 44.549 mAOD
10 Oct 01:00 ▬ steady 44.551 mAOD
10 Oct 00:00 ▬ steady 44.551 mAOD
09 Oct 23:00 ▬ steady 44.552 mAOD
09 Oct 22:00 ▼ -0.2 cm 44.553 mAOD
09 Oct 21:00 ▼ -0.2 cm 44.555 mAOD
09 Oct 20:00 ▼ -0.2 cm 44.557 mAOD
09 Oct 19:00 ▼ -0.4 cm 44.559 mAOD
09 Oct 18:00 ▬ steady 44.563 mAOD
09 Oct 17:00 ▬ steady 44.563 mAOD
09 Oct 16:00 ▬ steady 44.563 mAOD
09 Oct 15:00 ▬ steady 44.564 mAOD
09 Oct 14:00 ▬ steady 44.564 mAOD
09 Oct 13:00 44.564 mAOD

Station Details

  • Monitoring Station: Ray Farm
  • Watercourse: Groundwater Level
  • Nearest Town: Marlow
  • County: Buckinghamshire
  • Coordinates: 51°36'19"N 0°44'54"W (51.605305, -0.748310)
  • Open in: Google Maps · Apple Maps (opens your maps app)
  • Date Opened: 25 Oct 2011
  • Status: Active
  • Station Type: Groundwater (borehole)
Technical details: references, datum, range, flow archive
  • Station Reference: SU89_82
  • RLOI id: 9584 (the EA's check-for-flooding station id)
  • EA Gauge ID: SU89_82-level-groundwater-i-1_h-mAOD
  • Parameter: Level
  • Unit: mAOD
  • Typical data delay: ~22 min (measured reading→publication lag)
  • Tidal: No
  • Lock / structure: No
  • Catchment Area: Thames from Hurley to Teddington
  • Typical Range: 43.080 – 55.000 mAOD
  • EA Cross-check: 44.55 mAOD (EA at 10 Oct 08:00)

Geographic coordinates may reflect the access point for the gauge, and not the precise location in the watercourse that it is taking readings from.

Nearby Stations

Gauges connected to this river, and others nearby. A distance “by river” follows the river on the map; any other is in a straight line.

Nearby

Rainfall & Weather

Loading rainfall and weather data...

How often this river runs high

In a typical year this gauge reaches its typical high of 55.00 m on about 6 days. This year so far: 0 days.

2026 0 days so far
2025 0 days
2024 43 days
2023 0 days
2022 0 days
2021 0 days
2020 0 days patchy data
2019 0 days
2018 0 days
2017 0 days patchy data

Counted from each day's highest reading. Days with missing or implausible readings are left out, so a year marked patchy may have run high more often than shown.

Flood history near this gauge

Official Environment Agency warnings issued since 2014 for the 5 flood areas linked to this gauge (nearest 3.7 km away).

1flood warning 18flood alerts

Most recent flood warning: 4 Oct 2020 — River Wye from West Wycombe down to Bourne End

Year by year
YearWarningsAlerts
2025 0 3
2024 0 6
2021 0 1
2020 1 1
2018 0 1
2016 0 1
2014 0 5

Warnings apply to a whole flood area, not necessarily this exact spot. Years before 2006 aren't covered by the EA's historic record. See also the Marlow flood history.

Flood areas linked to this gauge

Flood warnings and alerts are issued for whole areas. These are the 5 areas linked to this gauge, nearest first.

Frequently asked questions

Is the Groundwater Level at Ray Farm flooding today?

The current level is 44.55m, which is within the typical range of 43.08 to 55.00m. Flooding is unlikely at this level.

Is the river level rising or falling at Ray Farm?

Based on the most recent readings, the level is currently falling slightly. The chart above shows the last 12 hours of measurements by default (up to 7 days), updated roughly every 15 minutes.

Why is the level slowly falling?

When little or no rain has fallen for a while, a river level gradually drops as the water stored in the ground and soil drains away with nothing to replace it. This is called baseflow recession and is normal in dry spells. Only about 5.0mm of rain has fallen nearby in the last 7 days, so the flow is being sustained mainly by groundwater. A gentle decline like this is expected and is not a sign of a problem — downstream gauges often recede a little faster than headwaters further upstream, and levels recover once rain returns.

What is a normal level for the Groundwater Level at Ray Farm?

The typical range at this station is 43.08m to 55.00m, based on Environment Agency historical data. Levels above 55.00m are higher than usually seen and may indicate a flood risk.

How often is this river level data updated?

Readings are supplied by the Environment Agency gauge. FloodRadar checks for updates roughly every 15 minutes; the timestamp above shows how recent the latest available reading is.

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📮 Flood risk by postcode near this gauge

Postcodes within 5 km with properties in the Environment Agency’s rivers-and-sea flood-risk bands:

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