sampling point
Derry Brook At Roadbridge, Ashton Keynes

Description	DERRY BROOK AT ROADBRIDGE, ASHTON KEYNES
Sampling point ID	TH-PUTR0043
Type	Freshwater – Rivers
Status	open
Location	easting northing: 404752 192801 lat lon: 51.633993, -1.93273
Area	West Thames
Sub-Area	L&W North Wt
Summary	106 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.

19 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
NO FLOW/SAMP
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 106 sample results (note that in some cases this may take a considerable time, and use significant data bandwidth).

Samples from 30 Nov 2016 to 2 Aug 2024

Notation	Determinand	Units	30 Nov 2016 10:13	11 Jan 2017 10:33	15 Mar 2017 10:44	27 Jun 2019 11:53	11 Sep 2019 11:59	29 Oct 2019 09:15	29 Jan 2020 10:13	20 Jun 2024 13:26	12 Jul 2024 13:25	2 Aug 2024 10:53
0061	pH		7.85	7.84	7.84	7.58	7.72	7.47	7.75	7.41	7.35
0076	Temperature of Water	°C	2.7	7.4	9.5	14.3	14.1	7.7	3.9	15.6	15.5
0077	Conductivity at 25 C	μs/cm	650	522	549	603	699	444	407	748	705
0085	BOD : 5 Day ATU	mg/l								2.3	37
0111	Ammoniacal Nitrogen as N	mg/l	0.559	0.101	< 0.03	0.375	0.54	0.072	0.27	1.3	0.54
0116	Nitrogen, Total Oxidised as N	mg/l	2.6	2.91	1.15	1.41	< 0.2	1.7	1	1.9	1.7
0117	Nitrate as N	mg/l	2.56	2.89	1.14	1.3	0.181	1.68	0.982	1.82	1.61
0118	Nitrite as N	mg/l	0.0354	0.0215	0.008	0.107	0.019	0.019	0.018	0.081	0.09
0119	Ammonia un-ionised as N	mg/l	0.00423	0.00106	< 0.00037	0.00362	0.00706	0.00033	0.00178	0.00936	0.00336
0162	Alkalinity to pH 4.5 as CaCO3	mg/l	198	147	199	197	290	170	170	280	210
0180	Orthophosphate, reactive as P	mg/l	0.118	0.108	0.119	0.228	0.81	0.1	0.14	0.17	0.22
7668	No flow /No sample											0
9901	Oxygen, Dissolved, % Saturation	%	61.1	77.3	76	36.3	28.3	58	98	37.5	42.5
9924	Oxygen, Dissolved as O2	mg/l	8.28	9.28	8.67	3.71	2.9	6.91	12.9	3.72	4.23

Samples from 18 Nov 2015 to 20 Oct 2016

Notation	Determinand	Units	18 Nov 2015 11:44	25 Nov 2015 11:24	6 Jan 2016 11:07	22 Feb 2016 11:24	6 Apr 2016 11:34	4 May 2016 10:14	3 Jun 2016 11:40	15 Aug 2016 09:21	13 Sep 2016 10:54	20 Oct 2016 11:07
0061	pH		7.52	7.55	7.91	7.88	7.8	7.65	7.65	8.04	7.67	7.64
0076	Temperature of Water	°C	11.9	7.7	7.3	8.6	8.4	9.1	11.8	13.5	15.3	9.4
0077	Conductivity at 25 C	μs/cm	518	528	459	484	482	749	751	724	719	753
0111	Ammoniacal Nitrogen as N	mg/l	0.195	0.191	0.147	0.093	0.075	0.044	0.696	0.089	2.21	3.09
0116	Nitrogen, Total Oxidised as N	mg/l	2.49	2.44	2.09	1.7	1.33	0.98	1.96	0.58	0.64	< 0.2
0117	Nitrate as N	mg/l	2.44	2.41	2.06	1.68	1.31	0.972	1.86	0.569	0.563	0.144
0118	Nitrite as N	mg/l	0.0477	0.0324	0.0259	0.0169	0.0179	0.0081	0.0973	0.0113	0.0767	0.0562
0119	Ammonia un-ionised as N	mg/l	0.00137	0.00105	0.00179	0.00117	0.00077	0.00034	0.00654	0.0021	0.0282	0.0238
0162	Alkalinity to pH 4.5 as CaCO3	mg/l	163	161	172	176	180	242	257	236	268	313
0180	Orthophosphate, reactive as P	mg/l	0.179	0.129	0.103	0.109	0.07	0.069	0.24	0.118	0.485	1.16
9901	Oxygen, Dissolved, % Saturation	%	54.5	70.2	66.6	65.7	70.8	61.2	27.4	43.1	35.5	40.3
9924	Oxygen, Dissolved as O2	mg/l	5.87	8.36	8.01	7.66	8.29	7.05	2.96	4.48	3.55	4.61

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sampling point Derry Brook At Roadbridge, Ashton Keynes

Determinands

Sampling results

Samples from 30 Nov 2016 to 2 Aug 2024

Samples from 18 Nov 2015 to 20 Oct 2016

sampling point
Derry Brook At Roadbridge, Ashton Keynes