Rivers Brook Cherhill
EA name: RIVERS BK CHERHILL
Environment Agency sampling point SW-Z8480238 · Freshwater - rivers · listed as open (“open” does not mean it is sampled now)
These are samples taken on a date, not live readings of the river. Results reach the Environment Agency's archive days to months after the sample is taken, so the newest here may be weeks or months old. FloodRadar does not grade them.
Where and when
- Last sampled
- 18 May 2026, 10:584 months ago · time as the Environment Agency records it (UK clock time; the source gives no time zone). Not sampled since, as far as the archive shows: the Environment Agency was asked up to 30 Sep 2026 and had nothing newer.
- Samples banked
- 31 since 24 Jan 2025 Imported periods: 1 Oct 2023 – 30 Sep 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Monitoring (national agency policy)
- Where
- National Grid 402868, 170339As published, to the nearest 1 m. Open in a map
- River, by its own name
- Its name does not give one
- River, by the map
- River's BrookPlaced by position alone, on a line whose map name differs from its own, 6 m from the line.
- Next gauge downstream
- Calne On the River Marden · 4.2 km along the river
- Why it was sampled
- Monitoring (national agency policy) (31 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
100.7%
Sampled 18 May 2026, 4 months ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 May 2026, 10:58 | 100.7 | 100.7% |
| 5 May 2026, 12:42 | 98.6 | 98.6% |
| 20 Apr 2026, 14:50 | 101.4 | 101.4% |
| 10 Apr 2026, 13:07 | 102.1 | 102.1% |
| 16 Mar 2026, 14:13 | 98.8 | 98.8% |
| 11 Mar 2026, 12:54 | 99.4 | 99.4% |
| 24 Feb 2026, 13:51 | 103.8 | 103.8% |
| 5 Feb 2026, 13:15 | 95.7 | 95.7% |
| 28 Jan 2026, 14:01 | 100.3 | 100.3% |
| 13 Jan 2026, 12:01 | 95.2 | 95.2% |
| 17 Dec 2025, 15:21 | 93.4 | 93.4% |
| 3 Dec 2025, 10:47 | 94 | 94% |
| 26 Nov 2025, 12:37 | 97.2 | 97.2% |
| 17 Nov 2025, 11:35 | 92.3 | 92.3% |
| 3 Nov 2025, 12:08 | 84.6 | 84.6% |
| 28 Oct 2025, 09:40 | 82.6 | 82.6% |
| 23 Oct 2025, 13:31 | 90.5 | 90.5% |
| 3 Oct 2025, 12:38 | 90.8 | 90.8% |
| 18 Sep 2025, 14:48 | 94.3 | 94.3% |
| 12 Sep 2025, 11:39 | 95.1 | 95.1% |
| 27 Aug 2025, 10:34 | 91.9 | 91.9% |
| 6 Aug 2025, 16:31 | 92.6 | 92.6% |
| 29 Jul 2025, 12:00 | 92 | 92% |
| 15 Jul 2025, 16:24 | 97.2 | 97.2% |
| 19 Jun 2025, 10:37 | 100.1 | 100.1% |
| 4 Jun 2025, 12:02 | 98.8 | 98.8% |
| 13 May 2025, 09:44 | 97.4 | 97.4% |
| 24 Apr 2025, 10:56 | 102.5 | 102.5% |
| 4 Mar 2025, 16:27 | 98.2 | 98.2% |
| 7 Feb 2025, 14:56 | 98.8 | 98.8% |
| 24 Jan 2025, 14:41 | 100.1 | 100.1% |
Dissolved oxygen
as O2 · code 9924 · mg/l
11.1 mg/l
Sampled 18 May 2026, 4 months ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 May 2026, 10:58 | 11.1 | 11.1 mg/l |
| 5 May 2026, 12:42 | 10.7 | 10.7 mg/l |
| 20 Apr 2026, 14:50 | 11 | 11 mg/l |
| 10 Apr 2026, 13:07 | 11.3 | 11.3 mg/l |
| 16 Mar 2026, 14:13 | 11 | 11 mg/l |
| 11 Mar 2026, 12:54 | 11 | 11 mg/l |
| 24 Feb 2026, 13:51 | 11.5 | 11.5 mg/l |
| 5 Feb 2026, 13:15 | 10.7 | 10.7 mg/l |
| 28 Jan 2026, 14:01 | 11.3 | 11.3 mg/l |
| 13 Jan 2026, 12:01 | 10.7 | 10.7 mg/l |
| 17 Dec 2025, 15:21 | 10.5 | 10.5 mg/l |
| 3 Dec 2025, 10:47 | 11.3 | 11.3 mg/l |
| 26 Nov 2025, 12:37 | 12 | 12 mg/l |
| 17 Nov 2025, 11:35 | 10.8 | 10.8 mg/l |
| 3 Nov 2025, 12:08 | 9.18 | 9.18 mg/l |
| 28 Oct 2025, 09:40 | 9.2 | 9.2 mg/l |
| 23 Oct 2025, 13:31 | 10.1 | 10.1 mg/l |
| 3 Oct 2025, 12:38 | 9.5 | 9.5 mg/l |
| 18 Sep 2025, 14:48 | 9.51 | 9.51 mg/l |
| 12 Sep 2025, 11:39 | 10.2 | 10.2 mg/l |
| 27 Aug 2025, 10:34 | 9.64 | 9.64 mg/l |
| 6 Aug 2025, 16:31 | 9.44 | 9.44 mg/l |
| 29 Jul 2025, 12:00 | 9.85 | 9.85 mg/l |
| 15 Jul 2025, 16:24 | 10.1 | 10.1 mg/l |
| 19 Jun 2025, 10:37 | 10.5 | 10.5 mg/l |
| 4 Jun 2025, 12:02 | 10.8 | 10.8 mg/l |
| 13 May 2025, 09:44 | 10.7 | 10.7 mg/l |
| 24 Apr 2025, 10:56 | 11.5 | 11.5 mg/l |
| 4 Mar 2025, 16:27 | 11 | 11 mg/l |
| 7 Feb 2025, 14:56 | 11.5 | 11.5 mg/l |
| 24 Jan 2025, 14:41 | 11.4 | 11.4 mg/l |
Water temperature
code 0076 · °C
10.8 °C
Sampled 18 May 2026, 4 months ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 May 2026, 10:58 | 10.8 | 10.8 °C |
| 5 May 2026, 12:42 | 11.8 | 11.8 °C |
| 20 Apr 2026, 14:50 | 11.6 | 11.6 °C |
| 10 Apr 2026, 13:07 | 10.8 | 10.8 °C |
| 16 Mar 2026, 14:13 | 10.6 | 10.6 °C |
| 11 Mar 2026, 12:54 | 10.8 | 10.8 °C |
| 24 Feb 2026, 13:51 | 10.8 | 10.8 °C |
| 5 Feb 2026, 13:15 | 10.3 | 10.3 °C |
| 28 Jan 2026, 14:01 | 10 | 10 °C |
| 13 Jan 2026, 12:01 | 10 | 10 °C |
| 17 Dec 2025, 15:21 | 10 | 10 °C |
| 3 Dec 2025, 10:47 | 7.5 | 7.5 °C |
| 26 Nov 2025, 12:37 | 6.2 | 6.2 °C |
| 17 Nov 2025, 11:35 | 8.3 | 8.3 °C |
| 3 Nov 2025, 12:08 | 11.6 | 11.6 °C |
| 28 Oct 2025, 09:40 | 10.5 | 10.5 °C |
| 23 Oct 2025, 13:31 | 10.2 | 10.2 °C |
| 3 Oct 2025, 12:38 | 13.2 | 13.2 °C |
| 18 Sep 2025, 14:48 | 14.9 | 14.9 °C |
| 12 Sep 2025, 11:39 | 12.3 | 12.3 °C |
| 27 Aug 2025, 10:34 | 13.1 | 13.1 °C |
| 6 Aug 2025, 16:31 | 14.4 | 14.4 °C |
| 29 Jul 2025, 12:00 | 12.2 | 12.2 °C |
| 15 Jul 2025, 16:24 | 13.7 | 13.7 °C |
| 19 Jun 2025, 10:37 | 13.1 | 13.1 °C |
| 4 Jun 2025, 12:02 | 11.4 | 11.4 °C |
| 13 May 2025, 09:44 | 11.1 | 11.1 °C |
| 24 Apr 2025, 10:56 | 10.1 | 10.1 °C |
| 4 Mar 2025, 16:27 | 10.4 | 10.4 °C |
| 7 Feb 2025, 14:56 | 8.8 | 8.8 °C |
| 24 Jan 2025, 14:41 | 9.6 | 9.6 °C |
pH
code 0061
8.14
Sampled 18 May 2026, 4 months ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 May 2026, 10:58 | 8.14 | 8.14 |
| 5 May 2026, 12:42 | 8.35 | 8.35 |
| 20 Apr 2026, 14:50 | 8.04 | 8.04 |
| 10 Apr 2026, 13:07 | 8.05 | 8.05 |
| 16 Mar 2026, 14:13 | 7.94 | 7.94 |
| 11 Mar 2026, 12:54 | 7.93 | 7.93 |
| 24 Feb 2026, 13:51 | 7.75 | 7.75 |
| 5 Feb 2026, 13:15 | 7.65 | 7.65 |
| 28 Jan 2026, 14:01 | 7.83 | 7.83 |
| 13 Jan 2026, 12:01 | 7.86 | 7.86 |
| 17 Dec 2025, 15:21 | 8.03 | 8.03 |
| 3 Dec 2025, 10:47 | 8.17 | 8.17 |
| 26 Nov 2025, 12:37 | 8.31 | 8.31 |
| 17 Nov 2025, 11:35 | 8.19 | 8.19 |
| 3 Nov 2025, 12:08 | 8.13 | 8.13 |
| 28 Oct 2025, 09:40 | 8.09 | 8.09 |
| 23 Oct 2025, 13:31 | 8.18 | 8.18 |
| 3 Oct 2025, 12:38 | 8.17 | 8.17 |
| 18 Sep 2025, 14:48 | 8.11 | 8.11 |
| 12 Sep 2025, 11:39 | 8.23 | 8.23 |
| 27 Aug 2025, 10:34 | 8.12 | 8.12 |
| 6 Aug 2025, 16:31 | 8.18 | 8.18 |
| 29 Jul 2025, 12:00 | 8.12 | 8.12 |
| 15 Jul 2025, 16:24 | 8.14 | 8.14 |
| 19 Jun 2025, 10:37 | 8.11 | 8.11 |
| 4 Jun 2025, 12:02 | 8.16 | 8.16 |
| 13 May 2025, 09:44 | 8.11 | 8.11 |
| 24 Apr 2025, 10:56 | 8.19 | 8.19 |
| 4 Mar 2025, 16:27 | 7.86 | 7.86 |
| 7 Feb 2025, 14:56 | 7.85 | 7.85 |
| 24 Jan 2025, 14:41 | 7.86 | 7.86 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
below 0.03 mg/l (not detected above this)
Sampled 18 May 2026, 4 months ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 May 2026, 10:58 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 May 2026, 12:42 | <0.03 | below 0.03 mg/l (not detected above this) |
| 20 Apr 2026, 14:50 | 0.039 | 0.039 mg/l |
| 10 Apr 2026, 13:07 | <0.03 | below 0.03 mg/l (not detected above this) |
| 16 Mar 2026, 14:13 | <0.03 | below 0.03 mg/l (not detected above this) |
| 11 Mar 2026, 12:54 | <0.03 | below 0.03 mg/l (not detected above this) |
| 24 Feb 2026, 13:51 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Feb 2026, 13:15 | <0.03 | below 0.03 mg/l (not detected above this) |
| 28 Jan 2026, 14:01 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 Jan 2026, 12:01 | <0.03 | below 0.03 mg/l (not detected above this) |
| 17 Dec 2025, 15:21 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Dec 2025, 10:47 | <0.03 | below 0.03 mg/l (not detected above this) |
| 26 Nov 2025, 12:37 | 0.07 | 0.07 mg/l |
| 17 Nov 2025, 11:35 | 0.079 | 0.079 mg/l |
| 3 Nov 2025, 12:08 | <0.03 | below 0.03 mg/l (not detected above this) |
| 28 Oct 2025, 09:40 | 0.037 | 0.037 mg/l |
| 23 Oct 2025, 13:31 | <0.03 | below 0.03 mg/l (not detected above this) |
| 3 Oct 2025, 12:38 | <0.03 | below 0.03 mg/l (not detected above this) |
| 18 Sep 2025, 14:48 | <0.03 | below 0.03 mg/l (not detected above this) |
| 12 Sep 2025, 11:39 | 0.038 | 0.038 mg/l |
| 27 Aug 2025, 10:34 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Aug 2025, 16:31 | <0.03 | below 0.03 mg/l (not detected above this) |
| 29 Jul 2025, 12:00 | 0.059 | 0.059 mg/l |
| 15 Jul 2025, 16:24 | 0.032 | 0.032 mg/l |
| 19 Jun 2025, 10:37 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Jun 2025, 12:02 | <0.03 | below 0.03 mg/l (not detected above this) |
| 13 May 2025, 09:44 | <0.03 | below 0.03 mg/l (not detected above this) |
| 24 Apr 2025, 10:56 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Mar 2025, 16:27 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Feb 2025, 14:56 | <0.03 | below 0.03 mg/l (not detected above this) |
| 24 Jan 2025, 14:41 | <0.03 | below 0.03 mg/l (not detected above this) |
Nitrate
as nitrogen (N) · code 0117 · mg/l
5.2 mg/l
Sampled 18 May 2026, 4 months ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 May 2026, 10:58 | 5.2 | 5.2 mg/l |
| 5 May 2026, 12:42 | 5.4 | 5.4 mg/l |
| 20 Apr 2026, 14:50 | 5.9 | 5.9 mg/l |
| 10 Apr 2026, 13:07 | 6.3 | 6.3 mg/l |
| 16 Mar 2026, 14:13 | 7.3 | 7.3 mg/l |
| 11 Mar 2026, 12:54 | 7.3 | 7.3 mg/l |
| 24 Feb 2026, 13:51 | 8.1 | 8.1 mg/l |
| 5 Feb 2026, 13:15 | 8.3 | 8.3 mg/l |
| 28 Jan 2026, 14:01 | 8.4 | 8.4 mg/l |
| 13 Jan 2026, 12:01 | 5.9 | 5.9 mg/l |
| 17 Dec 2025, 15:21 | 5.5 | 5.5 mg/l |
| 3 Dec 2025, 10:47 | 4.29 | 4.29 mg/l |
| 26 Nov 2025, 12:37 | 3.29 | 3.29 mg/l |
| 17 Nov 2025, 11:35 | 4.29 | 4.29 mg/l |
| 3 Nov 2025, 12:08 | 2.69 | 2.69 mg/l |
| 28 Oct 2025, 09:40 | 2.79 | 2.79 mg/l |
| 23 Oct 2025, 13:31 | 2.99 | 2.99 mg/l |
| 3 Oct 2025, 12:38 | 2.99 | 2.99 mg/l |
| 18 Sep 2025, 14:48 | 3.29 | 3.29 mg/l |
| 12 Sep 2025, 11:39 | 3.29 | 3.29 mg/l |
| 27 Aug 2025, 10:34 | 3.49 | 3.49 mg/l |
| 6 Aug 2025, 16:31 | 3.79 | 3.79 mg/l |
| 29 Jul 2025, 12:00 | 3.89 | 3.89 mg/l |
| 15 Jul 2025, 16:24 | 4.2 | 4.2 mg/l |
| 19 Jun 2025, 10:37 | 4.5 | 4.5 mg/l |
| 4 Jun 2025, 12:02 | 4.8 | 4.8 mg/l |
| 13 May 2025, 09:44 | 5.4 | 5.4 mg/l |
| 24 Apr 2025, 10:56 | 5.6 | 5.6 mg/l |
| 4 Mar 2025, 16:27 | 7.6 | 7.6 mg/l |
| 7 Feb 2025, 14:56 | 7.9 | 7.9 mg/l |
| 24 Jan 2025, 14:41 | 6.7 | 6.7 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.062 mg/l
Sampled 18 May 2026, 4 months ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 May 2026, 10:58 | 0.062 | 0.062 mg/l |
| 5 May 2026, 12:42 | 0.075 | 0.075 mg/l |
| 20 Apr 2026, 14:50 | 0.063 | 0.063 mg/l |
| 10 Apr 2026, 13:07 | 0.069 | 0.069 mg/l |
| 16 Mar 2026, 14:13 | 0.076 | 0.076 mg/l |
| 11 Mar 2026, 12:54 | 0.073 | 0.073 mg/l |
| 24 Feb 2026, 13:51 | 0.073 | 0.073 mg/l |
| 5 Feb 2026, 13:15 | 0.073 | 0.073 mg/l |
| 28 Jan 2026, 14:01 | 0.085 | 0.085 mg/l |
| 13 Jan 2026, 12:01 | 0.082 | 0.082 mg/l |
| 17 Dec 2025, 15:21 | 0.08 | 0.08 mg/l |
| 3 Dec 2025, 10:47 | 0.098 | 0.098 mg/l |
| 26 Nov 2025, 12:37 | 0.085 | 0.085 mg/l |
| 17 Nov 2025, 11:35 | 0.099 | 0.099 mg/l |
| 3 Nov 2025, 12:08 | 0.071 | 0.071 mg/l |
| 28 Oct 2025, 09:40 | 0.074 | 0.074 mg/l |
| 23 Oct 2025, 13:31 | 0.072 | 0.072 mg/l |
| 3 Oct 2025, 12:38 | 0.077 | 0.077 mg/l |
| 18 Sep 2025, 14:48 | 0.051 | 0.051 mg/l |
| 12 Sep 2025, 11:39 | 0.067 | 0.067 mg/l |
| 27 Aug 2025, 10:34 | 0.048 | 0.048 mg/l |
| 6 Aug 2025, 16:31 | 0.05 | 0.05 mg/l |
| 29 Jul 2025, 12:00 | 0.051 | 0.051 mg/l |
| 15 Jul 2025, 16:24 | 0.055 | 0.055 mg/l |
| 19 Jun 2025, 10:37 | 0.064 | 0.064 mg/l |
| 4 Jun 2025, 12:02 | 0.064 | 0.064 mg/l |
| 13 May 2025, 09:44 | 0.071 | 0.071 mg/l |
| 24 Apr 2025, 10:56 | 0.067 | 0.067 mg/l |
| 4 Mar 2025, 16:27 | 0.067 | 0.067 mg/l |
| 7 Feb 2025, 14:56 | 0.075 | 0.075 mg/l |
| 24 Jan 2025, 14:41 | 0.074 | 0.074 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
722 µS/cm
Sampled 18 May 2026, 4 months ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 18 May 2026, 10:58 | 722 | 722 µS/cm |
| 5 May 2026, 12:42 | 724 | 724 µS/cm |
| 20 Apr 2026, 14:50 | 726 | 726 µS/cm |
| 10 Apr 2026, 13:07 | 587 | 587 µS/cm |
| 16 Mar 2026, 14:13 | 726 | 726 µS/cm |
| 11 Mar 2026, 12:54 | 725 | 725 µS/cm |
| 24 Feb 2026, 13:51 | 717 | 717 µS/cm |
| 5 Feb 2026, 13:15 | 716 | 716 µS/cm |
| 28 Jan 2026, 14:01 | 714 | 714 µS/cm |
| 13 Jan 2026, 12:01 | 715 | 715 µS/cm |
| 17 Dec 2025, 15:21 | 713 | 713 µS/cm |
| 3 Dec 2025, 10:47 | 729 | 729 µS/cm |
| 26 Nov 2025, 12:37 | 732 | 732 µS/cm |
| 17 Nov 2025, 11:35 | 729 | 729 µS/cm |
| 3 Nov 2025, 12:08 | 709 | 709 µS/cm |
| 28 Oct 2025, 09:40 | 718 | 718 µS/cm |
| 23 Oct 2025, 13:31 | 704 | 704 µS/cm |
| 3 Oct 2025, 12:38 | 707 | 707 µS/cm |
| 18 Sep 2025, 14:48 | 694 | 694 µS/cm |
| 12 Sep 2025, 11:39 | 697 | 697 µS/cm |
| 27 Aug 2025, 10:34 | 689 | 689 µS/cm |
| 6 Aug 2025, 16:31 | 684 | 684 µS/cm |
| 29 Jul 2025, 12:00 | 708 | 708 µS/cm |
| 15 Jul 2025, 16:24 | 706 | 706 µS/cm |
| 19 Jun 2025, 10:37 | 719 | 719 µS/cm |
| 4 Jun 2025, 12:02 | 721 | 721 µS/cm |
| 13 May 2025, 09:44 | 729 | 729 µS/cm |
| 24 Apr 2025, 10:56 | 727 | 727 µS/cm |
| 4 Mar 2025, 16:27 | 729 | 729 µS/cm |
| 7 Feb 2025, 14:56 | 709 | 709 µS/cm |
| 24 Jan 2025, 14:41 | 721 | 721 µS/cm |
Everything measured here
13 determinands, each kept by its code, unit and sample material: results in different units or on different materials are never mixed. A “below” result is under the laboratory's detection limit, not zero.
Show all 13 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 31 | Jan 2025 – May 2026 | 100.7% 18 May 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 31 | Jan 2025 – May 2026 | 11.1 mg/l 18 May 2026 |
| Temperature of Water 0076 | River water | 31 | Jan 2025 – May 2026 | 10.8 °C 18 May 2026 |
| pH 0061 | River water | 31 | Jan 2025 – May 2026 | 8.14 18 May 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 31 | Jan 2025 – May 2026 | below 0.03 mg/l 18 May 2026 |
| Nitrate as N 0117 | River water | 31 | Jan 2025 – May 2026 | 5.2 mg/l 18 May 2026 |
| Orthophosphate, reactive as P 0180 | River water | 31 | Jan 2025 – May 2026 | 0.062 mg/l 18 May 2026 |
| Conductivity at 25 C 0077 | River water | 31 | Jan 2025 – May 2026 | 722 µS/cm 18 May 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 31 | Jan 2025 – May 2026 | 300 mg/l 18 May 2026 |
| Ammonia un-ionised as N 0119 | River water | 31 | Jan 2025 – May 2026 | below 0.00058 mg/l 18 May 2026 |
| BOD : 5 Day ATU 0085 | River water | 30 | Jan 2025 – May 2026 | 1.1 mg/l 18 May 2026 |
| Nitrite as N 0118 | River water | 31 | Jan 2025 – May 2026 | 0.004 mg/l 18 May 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 31 | Jan 2025 – May 2026 | 5.2 mg/l 18 May 2026 |
FloodRadar does not grade these results: there is no overall score, and official river classifications are a separate dataset. A sample taken downstream of an overflow does not by itself show where anything in it came from. River connections and distances are traced on OS Open Rivers (edition 2026-04), which leaves out many small channels.
Water samples: Environment Agency Water Quality Archive, © Environment Agency and/or database right 2026, Open Government Licence v3.0.
Contains OS data © Crown copyright and database rights 2026.