sampling point
Cholsey Brook 500 M Above Cholsey Stw

Description	CHOLSEY BROOK 500M ABOVE CHOLSEY STW
Sampling point ID	TH-PTHR0015
Type	Freshwater – Rivers
Status	open
Location	easting northing: 458653 186829 lat lon: 51.577277, -1.154984
Area	West Thames
Sub-Area	L&W North Wt
Summary	154 samples taken between 2024 and 2000

Determinands identify a property which can be measured on a sample or the sampling environment, together with the units in which the result of that measurement will be expressed.

18 determinands have been measured at this site

Action taken
Alky pH 4.5
Ammonia(N)
BOD ATU
Chloride Ion
Cond @ 25C
N Oxidised
NH3 un-ion
Nitrate-N
Nitrite-N
O Diss %sat
Orthophospht
Oxygen Diss
SI-GQA
Temp Water
Type of Flow
pH
pH in-situ

Displaying the twenty most recent samples. You can see all 154 sample results (note that in some cases this may take a considerable time, and use significant data bandwidth).

Samples from 12 Oct 2023 to 17 Jul 2024

Notation	Determinand	Units	12 Oct 2023 11:38	20 Nov 2023 13:53	4 Dec 2023 14:50	15 Jan 2024 10:38	21 Feb 2024 12:17	19 Mar 2024 14:24	18 Apr 2024 14:34	13 May 2024 08:24	17 Jun 2024 13:26	17 Jul 2024 10:03
0061	pH		7.49	7.5	7.52	7.7	7.63	7.61	7.9	7.87	7.81	7.85
0076	Temperature of Water	°C	12.7	10.6	8.9	5.8	9.8	11.6	11.2	12.8	13.4	13.3
0077	Conductivity at 25 C	μs/cm	674	751	746	724	713	709	686	693	668	668
0085	BOD : 5 Day ATU	mg/l	1.4	< 2	< 2	< 1	< 1	< 1	< 2	1.2	1	< 1
0111	Ammoniacal Nitrogen as N	mg/l	< 0.03	< 0.03	< 0.03	< 0.03	0.035	< 0.03	< 0.03	0.031	< 0.03	< 0.03
0116	Nitrogen, Total Oxidised as N	mg/l	6.7	7.1	6.3	9	8.3	9.5	9.8	9.3	9.5	8.4
0117	Nitrate as N	mg/l	6.68	7.08	6.28	8.99	8.29	9.49	9.79	9.28	9.48	8.38
0118	Nitrite as N	mg/l	0.018	0.02	0.017	0.014	0.014	0.011	0.011	0.021	0.017	0.018
0119	Ammonia un-ionised as N	mg/l	< 0.00021	< 0.00018	< 0.00017	< 0.0002	0.00027	< 0.00025	< 0.00048	0.00052	< 0.00046	< 0.0005
0162	Alkalinity to pH 4.5 as CaCO3	mg/l	260	300	290	280	270	270	240	260	240	250
0180	Orthophosphate, reactive as P	mg/l	0.018	0.02	0.028	0.024	0.029	0.018	0.018	0.02	0.027	0.022
9901	Oxygen, Dissolved, % Saturation	%	78.1	67.7	72.8	78.7	81.6	92.4	98.3	85.1	90.4	91.5
9924	Oxygen, Dissolved as O2	mg/l	8.27	7.52	8.42	9.83	9.24	10	10.8	8.99	9.42	9.55

Samples from 29 Nov 2016 to 18 Sep 2023

Notation	Determinand	Units	29 Nov 2016 15:45	5 Jan 2017 17:07	10 Feb 2017 16:05	9 Mar 2017 14:34	16 May 2023 14:02	29 Jun 2023 12:39	20 Jul 2023 14:16	2 Aug 2023 13:20	4 Sep 2023 12:16	18 Sep 2023 10:55
0061	pH		7.63	7.74	7.69	7.72	7.64	7.7	7.9	7.95	7.91	8.87
0076	Temperature of Water	°C	6.2	4.9	6.1	11	11.8	14.5	14.1	14.4	14.3	14.1
0077	Conductivity at 25 C	μs/cm	755	724	754	750	689	638	635	637	650	641
0085	BOD : 5 Day ATU	mg/l						1.3		< 3	< 1
0111	Ammoniacal Nitrogen as N	mg/l	< 0.03	< 0.03	< 0.03	< 0.03	< 0.03	< 0.03	0.037	< 0.03	0.037	< 0.03
0116	Nitrogen, Total Oxidised as N	mg/l	6.78	7.11	7.23	6.81	8.2	7.7	7.8	7.7	7.8	7.4
0117	Nitrate as N	mg/l	6.76	7.1	7.22	6.8	8.18	7.67	7.79	7.69	7.79	7.38
0118	Nitrite as N	mg/l	0.0154	0.0098	0.0111	0.0101	0.016	0.026	0.015	0.014	0.012	0.016
0119	Ammonia un-ionised as N	mg/l	< 0.00018	< 0.00021	< 0.0002	< 0.00031	< 0.00028	< 0.00039	0.00073	< 0.00067	0.00075	< 0.00074
0162	Alkalinity to pH 4.5 as CaCO3	mg/l	279	271	275	282	270	230	240	240	240	240
0180	Orthophosphate, reactive as P	mg/l	0.014	0.017	0.019	0.017	0.017	0.019	0.021	0.038	0.02	0.026
9901	Oxygen, Dissolved, % Saturation	%	66.4	82.9	74.6	90.2	94.5	81.3	88.1	87.2	89.7	78.6
9924	Oxygen, Dissolved as O2	mg/l	8.21	10.6	9.25	9.93	10.2	8.27	9.04	8.89	9.16	8.06

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sampling point Cholsey Brook 500 M Above Cholsey Stw

Determinands

Sampling results

Samples from 12 Oct 2023 to 17 Jul 2024

Samples from 29 Nov 2016 to 18 Sep 2023

sampling point
Cholsey Brook 500 M Above Cholsey Stw