Chess at Road Bridge, Latimer
EA name: CHESS AT ROAD BRIDGE, LATIMER
Environment Agency sampling point TH-PCNR0019 · 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
- 4 Sep 2026, 10:4627 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 36 since 10 Oct 2023 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 500445, 198564As published, to the nearest 1 m. Open in a map
- River, by its own name
- Chess
- River, by the map
- River ChessPlaced on the river its name gives, 2 m from the line.
- Next gauge downstream
- Rickmansworth On the River Chess · 9.5 km along the river
- Nearest gauge upstream
- Chesham On the River Chess · 5.8 km along the river
- Why it was sampled
- Monitoring (national agency policy) (31 samples)
Planned investigation (local monitoring) (5 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
95.2%
Sampled 4 Sep 2026, 27 days ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 10:46 | 95.2 | 95.2% |
| 3 Aug 2026, 10:08 | 86.4 | 86.4% |
| 6 Jul 2026, 11:20 | 106.6 | 106.6% |
| 5 Jun 2026, 09:30 | 95 | 95% |
| 1 May 2026, 09:01 | 99.7 | 99.7% |
| 7 Apr 2026, 09:46 | 94.7 | 94.7% |
| 3 Mar 2026, 09:45 | 98.9 | 98.9% |
| 11 Feb 2026, 11:56 | 98.6 | 98.6% |
| 15 Jan 2026, 10:28 | 90.2 | 90.2% |
| 5 Dec 2025, 10:52 | 88.5 | 88.5% |
| 7 Nov 2025, 08:58 | 90.3 | 90.3% |
| 15 Oct 2025, 09:59 | 94.6 | 94.6% |
| 1 Sep 2025, 12:36 | 100.9 | 100.9% |
| 5 Aug 2025, 10:12 | 94.8 | 94.8% |
| 4 Apr 2025, 10:06 | 100.9 | 100.9% |
| 18 Mar 2025, 09:23 | 96.9 | 96.9% |
| 6 Feb 2025, 09:24 | 96.2 | 96.2% |
| 14 Jan 2025, 10:21 | 92.5 | 92.5% |
| 2 Dec 2024, 14:03 | 91.8 | 91.8% |
| 12 Nov 2024, 11:47 | 90 | 90% |
| 3 Oct 2024, 09:52 | 91.1 | 91.1% |
| 3 Sep 2024, 10:32 | 94.6 | 94.6% |
| 1 Aug 2024, 10:57 | 114.5 | 114.5% |
| 2 Jul 2024, 14:27 | 96.1 | 96.1% |
| 4 Jun 2024, 12:22 | 86.9 | 86.9% |
| 5 Mar 2024, 11:39 | 81.2 | 81.2% |
| 7 Feb 2024, 11:34 | 96.7 | 96.7% |
| 10 Jan 2024, 13:01 | 89.1 | 89.1% |
| 5 Dec 2023, 11:30 | 91 | 91% |
| 3 Nov 2023, 11:02 | 92.6 | 92.6% |
| 10 Oct 2023, 12:41 | 96.1 | 96.1% |
Dissolved oxygen
as O2 · code 9924 · mg/l
9.06 mg/l
Sampled 4 Sep 2026, 27 days ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 10:46 | 9.06 | 9.06 mg/l |
| 3 Aug 2026, 10:08 | 8.77 | 8.77 mg/l |
| 6 Jul 2026, 11:20 | 9.63 | 9.63 mg/l |
| 5 Jun 2026, 09:30 | 9.87 | 9.87 mg/l |
| 1 May 2026, 09:01 | 10.8 | 10.8 mg/l |
| 7 Apr 2026, 09:46 | 10.8 | 10.8 mg/l |
| 3 Mar 2026, 09:45 | 11.2 | 11.2 mg/l |
| 11 Feb 2026, 11:56 | 10.8 | 10.8 mg/l |
| 15 Jan 2026, 10:28 | 10.3 | 10.3 mg/l |
| 5 Dec 2025, 10:52 | 10.4 | 10.4 mg/l |
| 7 Nov 2025, 08:58 | 9.47 | 9.47 mg/l |
| 15 Oct 2025, 09:59 | 10.1 | 10.1 mg/l |
| 1 Sep 2025, 12:36 | 9.75 | 9.75 mg/l |
| 5 Aug 2025, 10:12 | 9.99 | 9.99 mg/l |
| 4 Apr 2025, 10:06 | 11 | 11 mg/l |
| 18 Mar 2025, 09:23 | 11.6 | 11.6 mg/l |
| 6 Feb 2025, 09:24 | 11.7 | 11.7 mg/l |
| 14 Jan 2025, 10:21 | 11.4 | 11.4 mg/l |
| 2 Dec 2024, 14:03 | 10.3 | 10.3 mg/l |
| 12 Nov 2024, 11:47 | 10.2 | 10.2 mg/l |
| 3 Oct 2024, 09:52 | 9.75 | 9.75 mg/l |
| 3 Sep 2024, 10:32 | 9.2 | 9.2 mg/l |
| 1 Aug 2024, 10:57 | 10.3 | 10.3 mg/l |
| 2 Jul 2024, 14:27 | 9.77 | 9.77 mg/l |
| 4 Jun 2024, 12:22 | 8.82 | 8.82 mg/l |
| 5 Mar 2024, 11:39 | 9.17 | 9.17 mg/l |
| 7 Feb 2024, 11:34 | 11.1 | 11.1 mg/l |
| 10 Jan 2024, 13:01 | 10.8 | 10.8 mg/l |
| 5 Dec 2023, 11:30 | 10.7 | 10.7 mg/l |
| 3 Nov 2023, 11:02 | 10.2 | 10.2 mg/l |
| 10 Oct 2023, 12:41 | 9.67 | 9.67 mg/l |
Water temperature
code 0076 · °C
17.6 °C
Sampled 4 Sep 2026, 27 days ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 10:46 | 17.6 | 17.6 °C |
| 3 Aug 2026, 10:08 | 14.6 | 14.6 °C |
| 6 Jul 2026, 11:20 | 20.2 | 20.2 °C |
| 5 Jun 2026, 09:30 | 13.5 | 13.5 °C |
| 1 May 2026, 09:01 | 11.6 | 11.6 °C |
| 7 Apr 2026, 09:46 | 9.4 | 9.4 °C |
| 3 Mar 2026, 09:45 | 9.9 | 9.9 °C |
| 11 Feb 2026, 11:56 | 11.3 | 11.3 °C |
| 15 Jan 2026, 10:28 | 9.4 | 9.4 °C |
| 5 Dec 2025, 10:52 | 8.2 | 8.2 °C |
| 7 Nov 2025, 08:58 | 13.1 | 13.1 °C |
| 15 Oct 2025, 09:59 | 12.1 | 12.1 °C |
| 1 Sep 2025, 12:36 | 16.9 | 16.9 °C |
| 5 Aug 2025, 10:12 | 12.9 | 12.9 °C |
| 4 Apr 2025, 10:06 | 11.3 | 11.3 °C |
| 18 Mar 2025, 09:23 | 7.6 | 7.6 °C |
| 6 Feb 2025, 09:24 | 6.7 | 6.7 °C |
| 14 Jan 2025, 10:21 | 6.4 | 6.4 °C |
| 2 Dec 2024, 14:03 | 10 | 10 °C |
| 12 Nov 2024, 11:47 | 9.9 | 9.9 °C |
| 3 Oct 2024, 09:52 | 12.2 | 12.2 °C |
| 3 Sep 2024, 10:32 | 16.6 | 16.6 °C |
| 1 Aug 2024, 10:57 | 20.2 | 20.2 °C |
| 2 Jul 2024, 14:27 | 14.5 | 14.5 °C |
| 4 Jun 2024, 12:22 | 14.6 | 14.6 °C |
| 5 Mar 2024, 11:39 | 9.9 | 9.9 °C |
| 7 Feb 2024, 11:34 | 9.2 | 9.2 °C |
| 10 Jan 2024, 13:01 | 7 | 7 °C |
| 5 Dec 2023, 11:30 | 8.3 | 8.3 °C |
| 3 Nov 2023, 11:02 | 11 | 11 °C |
| 10 Oct 2023, 12:41 | 15 | 15 °C |
pH
code 0061
7.86
Sampled 4 Sep 2026, 27 days ago · 30 results banked
Every result (30)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 10:46 | 7.86 | 7.86 |
| 3 Aug 2026, 10:08 | 7.86 | 7.86 |
| 6 Jul 2026, 11:20 | 7.86 | 7.86 |
| 5 Jun 2026, 09:30 | 7.84 | 7.84 |
| 1 May 2026, 09:01 | 8.04 | 8.04 |
| 7 Apr 2026, 09:46 | 8.12 | 8.12 |
| 3 Mar 2026, 09:45 | 8.25 | 8.25 |
| 11 Feb 2026, 11:56 | 8.11 | 8.11 |
| 15 Jan 2026, 10:28 | 8.21 | 8.21 |
| 5 Dec 2025, 10:52 | 7.94 | 7.94 |
| 7 Nov 2025, 08:58 | 7.95 | 7.95 |
| 15 Oct 2025, 09:59 | 7.94 | 7.94 |
| 1 Sep 2025, 12:36 | 8.06 | 8.06 |
| 5 Aug 2025, 10:12 | 7.85 | 7.85 |
| 4 Apr 2025, 10:06 | 7.85 | 7.85 |
| 18 Mar 2025, 09:23 | 8.02 | 8.02 |
| 6 Feb 2025, 09:24 | 7.99 | 7.99 |
| 14 Jan 2025, 10:21 | 7.92 | 7.92 |
| 2 Dec 2024, 14:03 | 7.88 | 7.88 |
| 12 Nov 2024, 11:47 | 7.86 | 7.86 |
| 3 Oct 2024, 09:52 | 7.89 | 7.89 |
| 3 Sep 2024, 10:32 | 7.79 | 7.79 |
| 1 Aug 2024, 10:57 | 7.96 | 7.96 |
| 2 Jul 2024, 14:27 | 7.82 | 7.82 |
| 5 Mar 2024, 11:39 | 7.72 | 7.72 |
| 7 Feb 2024, 11:34 | 8.11 | 8.11 |
| 10 Jan 2024, 13:01 | 7.94 | 7.94 |
| 5 Dec 2023, 11:30 | 7.81 | 7.81 |
| 3 Nov 2023, 11:02 | 7.93 | 7.93 |
| 10 Oct 2023, 12:41 | 7.9 | 7.9 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.036 mg/l
Sampled 4 Sep 2026, 27 days ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 10:46 | 0.036 | 0.036 mg/l |
| 3 Aug 2026, 10:08 | <0.03 | below 0.03 mg/l (not detected above this) |
| 6 Jul 2026, 11:20 | <0.03 | below 0.03 mg/l (not detected above this) |
| 5 Jun 2026, 09:30 | 0.041 | 0.041 mg/l |
| 1 May 2026, 09:01 | 0.26 | 0.26 mg/l |
| 7 Apr 2026, 09:46 | 0.086 | 0.086 mg/l |
| 3 Mar 2026, 09:45 | <0.03 | below 0.03 mg/l (not detected above this) |
| 11 Feb 2026, 11:56 | 0.038 | 0.038 mg/l |
| 15 Jan 2026, 10:28 | 0.082 | 0.082 mg/l |
| 5 Dec 2025, 10:52 | 0.048 | 0.048 mg/l |
| 7 Nov 2025, 08:58 | 0.046 | 0.046 mg/l |
| 15 Oct 2025, 09:59 | 0.041 | 0.041 mg/l |
| 1 Sep 2025, 12:36 | 0.048 | 0.048 mg/l |
| 5 Aug 2025, 10:12 | <0.03 | below 0.03 mg/l (not detected above this) |
| 4 Apr 2025, 10:06 | 0.039 | 0.039 mg/l |
| 18 Mar 2025, 09:23 | 0.046 | 0.046 mg/l |
| 6 Feb 2025, 09:24 | 0.061 | 0.061 mg/l |
| 14 Jan 2025, 10:21 | 0.043 | 0.043 mg/l |
| 2 Dec 2024, 14:03 | 0.062 | 0.062 mg/l |
| 12 Nov 2024, 11:47 | 0.081 | 0.081 mg/l |
| 3 Oct 2024, 09:52 | 0.085 | 0.085 mg/l |
| 3 Sep 2024, 10:32 | 0.075 | 0.075 mg/l |
| 1 Aug 2024, 10:57 | <0.03 | below 0.03 mg/l (not detected above this) |
| 2 Jul 2024, 14:27 | 0.074 | 0.074 mg/l |
| 4 Jun 2024, 12:22 | 0.17 | 0.17 mg/l |
| 5 Mar 2024, 11:39 | 0.44 | 0.44 mg/l |
| 7 Feb 2024, 11:34 | 0.039 | 0.039 mg/l |
| 10 Jan 2024, 13:01 | 0.059 | 0.059 mg/l |
| 5 Dec 2023, 11:30 | 0.044 | 0.044 mg/l |
| 3 Nov 2023, 11:02 | 0.053 | 0.053 mg/l |
| 10 Oct 2023, 12:41 | 0.038 | 0.038 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
4.88 mg/l
Sampled 4 Sep 2026, 27 days ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 10:46 | 4.88 | 4.88 mg/l |
| 3 Aug 2026, 10:08 | 4.39 | 4.39 mg/l |
| 6 Jul 2026, 11:20 | 4.27 | 4.27 mg/l |
| 5 Jun 2026, 09:30 | 6.87 | 6.87 mg/l |
| 1 May 2026, 09:01 | 6.98 | 6.98 mg/l |
| 7 Apr 2026, 09:46 | 5.1 | 5.1 mg/l |
| 3 Mar 2026, 09:45 | 5.2 | 5.2 mg/l |
| 11 Feb 2026, 11:56 | 8.48 | 8.48 mg/l |
| 15 Jan 2026, 10:28 | 4.58 | 4.58 mg/l |
| 5 Dec 2025, 10:52 | 7.79 | 7.79 mg/l |
| 7 Nov 2025, 08:58 | 7.49 | 7.49 mg/l |
| 15 Oct 2025, 09:59 | 7.58 | 7.58 mg/l |
| 1 Sep 2025, 12:36 | 2.96 | 2.96 mg/l |
| 5 Aug 2025, 10:12 | 4.59 | 4.59 mg/l |
| 4 Apr 2025, 10:06 | 7.48 | 7.48 mg/l |
| 18 Mar 2025, 09:23 | 7.88 | 7.88 mg/l |
| 6 Feb 2025, 09:24 | 8.25 | 8.25 mg/l |
| 14 Jan 2025, 10:21 | 6.08 | 6.08 mg/l |
| 2 Dec 2024, 14:03 | 7.27 | 7.27 mg/l |
| 12 Nov 2024, 11:47 | 6.56 | 6.56 mg/l |
| 3 Oct 2024, 09:52 | 6.07 | 6.07 mg/l |
| 3 Sep 2024, 10:32 | 5.46 | 5.46 mg/l |
| 1 Aug 2024, 10:57 | 3.35 | 3.35 mg/l |
| 2 Jul 2024, 14:27 | 6.74 | 6.74 mg/l |
| 4 Jun 2024, 12:22 | 5.1 | 5.1 mg/l |
| 5 Mar 2024, 11:39 | 6.69 | 6.69 mg/l |
| 7 Feb 2024, 11:34 | 5.47 | 5.47 mg/l |
| 10 Jan 2024, 13:01 | 7.87 | 7.87 mg/l |
| 5 Dec 2023, 11:30 | 7.37 | 7.37 mg/l |
| 3 Nov 2023, 11:02 | 5.97 | 5.97 mg/l |
| 10 Oct 2023, 12:41 | 9.08 | 9.08 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.027 mg/l
Sampled 4 Sep 2026, 27 days ago · 31 results banked
Every result (31)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 10:46 | 0.027 | 0.027 mg/l |
| 3 Aug 2026, 10:08 | 0.049 | 0.049 mg/l |
| 6 Jul 2026, 11:20 | 0.011 | 0.011 mg/l |
| 5 Jun 2026, 09:30 | 0.16 | 0.16 mg/l |
| 1 May 2026, 09:01 | 0.19 | 0.19 mg/l |
| 7 Apr 2026, 09:46 | 0.19 | 0.19 mg/l |
| 3 Mar 2026, 09:45 | 0.046 | 0.046 mg/l |
| 11 Feb 2026, 11:56 | 0.049 | 0.049 mg/l |
| 15 Jan 2026, 10:28 | 0.057 | 0.057 mg/l |
| 5 Dec 2025, 10:52 | 0.036 | 0.036 mg/l |
| 7 Nov 2025, 08:58 | 0.034 | 0.034 mg/l |
| 15 Oct 2025, 09:59 | 0.039 | 0.039 mg/l |
| 1 Sep 2025, 12:36 | <0.01 | below 0.01 mg/l (not detected above this) |
| 5 Aug 2025, 10:12 | 0.048 | 0.048 mg/l |
| 4 Apr 2025, 10:06 | 0.032 | 0.032 mg/l |
| 18 Mar 2025, 09:23 | 0.054 | 0.054 mg/l |
| 6 Feb 2025, 09:24 | 0.049 | 0.049 mg/l |
| 14 Jan 2025, 10:21 | 0.055 | 0.055 mg/l |
| 2 Dec 2024, 14:03 | 0.25 | 0.25 mg/l |
| 12 Nov 2024, 11:47 | 0.2 | 0.2 mg/l |
| 3 Oct 2024, 09:52 | 0.2 | 0.2 mg/l |
| 3 Sep 2024, 10:32 | 0.2 | 0.2 mg/l |
| 1 Aug 2024, 10:57 | <0.01 | below 0.01 mg/l (not detected above this) |
| 2 Jul 2024, 14:27 | 0.048 | 0.048 mg/l |
| 4 Jun 2024, 12:22 | 0.057 | 0.057 mg/l |
| 5 Mar 2024, 11:39 | 0.19 | 0.19 mg/l |
| 7 Feb 2024, 11:34 | 0.13 | 0.13 mg/l |
| 10 Jan 2024, 13:01 | 0.22 | 0.22 mg/l |
| 5 Dec 2023, 11:30 | 0.27 | 0.27 mg/l |
| 3 Nov 2023, 11:02 | 0.23 | 0.23 mg/l |
| 10 Oct 2023, 12:41 | 0.56 | 0.56 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
611 µS/cm
Sampled 4 Sep 2026, 27 days ago · 30 results banked
Every result (30)
| Sampled | Result as published | Reads as |
|---|---|---|
| 4 Sep 2026, 10:46 | 611 | 611 µS/cm |
| 3 Aug 2026, 10:08 | 591 | 591 µS/cm |
| 6 Jul 2026, 11:20 | 556 | 556 µS/cm |
| 5 Jun 2026, 09:30 | 638 | 638 µS/cm |
| 1 May 2026, 09:01 | 649 | 649 µS/cm |
| 7 Apr 2026, 09:46 | 651 | 651 µS/cm |
| 3 Mar 2026, 09:45 | 599 | 599 µS/cm |
| 11 Feb 2026, 11:56 | 657 | 657 µS/cm |
| 15 Jan 2026, 10:28 | 743 | 743 µS/cm |
| 5 Dec 2025, 10:52 | 678 | 678 µS/cm |
| 7 Nov 2025, 08:58 | 658 | 658 µS/cm |
| 15 Oct 2025, 09:59 | 632 | 632 µS/cm |
| 1 Sep 2025, 12:36 | 530 | 530 µS/cm |
| 5 Aug 2025, 10:12 | 583 | 583 µS/cm |
| 4 Apr 2025, 10:06 | 625 | 625 µS/cm |
| 18 Mar 2025, 09:23 | 627 | 627 µS/cm |
| 6 Feb 2025, 09:24 | 636 | 636 µS/cm |
| 14 Jan 2025, 10:21 | 598 | 598 µS/cm |
| 2 Dec 2024, 14:03 | 634 | 634 µS/cm |
| 12 Nov 2024, 11:47 | 649 | 649 µS/cm |
| 3 Oct 2024, 09:52 | 600 | 600 µS/cm |
| 3 Sep 2024, 10:32 | 587 | 587 µS/cm |
| 1 Aug 2024, 10:57 | 515 | 515 µS/cm |
| 2 Jul 2024, 14:27 | 645 | 645 µS/cm |
| 4 Jun 2024, 12:22 | 604 | 604 µS/cm |
| 5 Mar 2024, 11:39 | 652 | 652 µS/cm |
| 7 Feb 2024, 11:34 | 582 | 582 µS/cm |
| 5 Dec 2023, 11:30 | 626 | 626 µS/cm |
| 3 Nov 2023, 11:02 | 574 | 574 µS/cm |
| 10 Oct 2023, 12:41 | 671 | 671 µS/cm |
Everything measured here
14 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 14 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 31 | Oct 2023 – Sep 2026 | 95.2% 4 Sep 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 31 | Oct 2023 – Sep 2026 | 9.06 mg/l 4 Sep 2026 |
| Temperature of Water 0076 | River water | 31 | Oct 2023 – Sep 2026 | 17.6 °C 4 Sep 2026 |
| pH 0061 | River water | 30 | Oct 2023 – Sep 2026 | 7.86 4 Sep 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 31 | Oct 2023 – Sep 2026 | 0.036 mg/l 4 Sep 2026 |
| Nitrate as N 0117 | River water | 31 | Oct 2023 – Sep 2026 | 4.88 mg/l 4 Sep 2026 |
| Orthophosphate, reactive as P 0180 | River water | 31 | Oct 2023 – Sep 2026 | 0.027 mg/l 4 Sep 2026 |
| Conductivity at 25 C 0077 | River water | 30 | Oct 2023 – Sep 2026 | 611 µS/cm 4 Sep 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 31 | Oct 2023 – Sep 2026 | 230 mg/l 4 Sep 2026 |
| Ammonia un-ionised as N 0119 | River water | 30 | Oct 2023 – Sep 2026 | 0.00083 mg/l 4 Sep 2026 |
| Chlorophyll : Acetone Extract 7887 | River water | 31 | Oct 2023 – Sep 2026 | 2.5 µg/l 4 Sep 2026 |
| Nitrite as N 0118 | River water | 31 | Oct 2023 – Sep 2026 | 0.024 mg/l 4 Sep 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 31 | Oct 2023 – Sep 2026 | 4.9 mg/l 4 Sep 2026 |
| Solids, Suspended at 105 C 0135 | River water | 33 | Oct 2023 – Sep 2026 | 7.2 mg/l 4 Sep 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.