{"data":[{"id":39001,"name":"Thames at Kingston","catchment-area":9948.0,
"grid-reference":{"ngr":"TQ17786985","easting":517780.0,"northing":169850.0},
"easting":517780.0,"northing":169850.0,"lat-long":{"string":
"51°24'55.5949\"N 0°18'27.7558\"W","latitude":51.41544,"longitude":-0.30771},
"latitude":51.41544,"longitude":-0.30771,"river":"Thames","location":"Kingston",
"station-level":4.7,"measuring-authority-id":"EA-T",
"measuring-authority-station-id":"3400TH","hydrometric-area":39,"opened":
"1883-01-01","closed":null,"station-type":"US","bankfull-flow":450.0,
"structurefull-flow":null,"sensitivity":null,"nrfa-mean-flow":true,
"nrfa-peak-flow":true,"feh-pooling":true,"feh-qmed":true,"feh-neither":false,
"nhmp":true,"benchmark":false,"live-data":true,"eflag":true,"historic-droughts":
true,"marius":true,"outlook-analogues":true,"outlook-esp":true,
"factors-affecting-runoff":"SRPGEI","gdf-start-date":"1883-01-01","gdf-end-date"
:"2025-09-30","gdf-mean-flow":65.802,"gdf-min-flow":0.01,"gdf-first-date-of-min"
:"1976-08-27","gdf-last-date-of-min":"1976-10-11","gdf-max-flow":800.0,
"gdf-first-date-of-max":"1894-11-18","gdf-last-date-of-max":"1894-11-18",
"gdf-q95-flow":7.58,"gdf-q70-flow":21.6,"gdf-q50-flow":40.3,"gdf-q10-flow":163.0
,"gdf-q05-flow":218.0,"gdf-base-flow-index":0.64,"gdf-day-count":52138,
"gdf-flow-count":52137,"gdf-percent-complete":99.998,"peak-flow-start-date":
"1883-01-01","peak-flow-end-date":null,"qmed":316.11,"minimum-altitude":3.4,
"10-percentile-altitude":50.4,"50-percentile-altitude":99.7,
"90-percentile-altitude":181.8,"maximum-altitude":330.2,"saar-1941-1970":724,
"saar-1961-1990":706,"saar-1991-2020":753,"lcm2000-woodland":0.1609,
"lcm2000-arable-horticultural":0.3562,"lcm2000-grassland":0.3217,
"lcm2000-mountain-heath-bog":0.0045,"lcm2000-urban":0.1404,"lcm2007-woodland":
0.1338,"lcm2007-arable-horticultural":0.393,"lcm2007-grassland":0.3402,
"lcm2007-mountain-heath-bog":0.01,"lcm2007-urban":0.1142,
"lcm1990-deciduous-woodland":0.1046,"lcm1990-evergreen-woodland":0.0196,
"lcm1990-cropland":0.3638,"lcm1990-grassland":0.3848,"lcm1990-shrubland":0.0059,
"lcm1990-bare-soil-rock":0.002,"lcm1990-inland-water":0.0083,
"lcm1990-built-up-areas":0.111,"lcm1990-not-classified":0.0,
"lcm2015-deciduous-woodland":0.1124,"lcm2015-evergreen-woodland":0.021,
"lcm2015-cropland":0.3707,"lcm2015-grassland":0.3377,"lcm2015-shrubland":0.0057,
"lcm2015-bare-soil-rock":0.0012,"lcm2015-inland-water":0.0115,
"lcm2015-built-up-areas":0.1398,"lcm2015-not-classified":0.0,
"lcm2017-deciduous-woodland":0.1168,"lcm2017-evergreen-woodland":0.0223,
"lcm2017-cropland":0.3521,"lcm2017-grassland":0.3454,"lcm2017-shrubland":0.0055,
"lcm2017-bare-soil-rock":0.0002,"lcm2017-inland-water":0.0132,
"lcm2017-built-up-areas":0.1445,"lcm2017-not-classified":0.0,
"lcm2018-deciduous-woodland":0.1141,"lcm2018-evergreen-woodland":0.0219,
"lcm2018-cropland":0.3474,"lcm2018-grassland":0.3546,"lcm2018-shrubland":0.0052,
"lcm2018-bare-soil-rock":0.0003,"lcm2018-inland-water":0.0126,
"lcm2018-built-up-areas":0.1439,"lcm2018-not-classified":0.0,
"lcm2019-deciduous-woodland":0.1151,"lcm2019-evergreen-woodland":0.0231,
"lcm2019-cropland":0.3407,"lcm2019-grassland":0.3561,"lcm2019-shrubland":0.0054,
"lcm2019-bare-soil-rock":0.0002,"lcm2019-inland-water":0.0131,
"lcm2019-built-up-areas":0.1463,"lcm2019-not-classified":0.0,
"lcm2020-deciduous-woodland":0.1167,"lcm2020-evergreen-woodland":0.0206,
"lcm2020-cropland":0.3324,"lcm2020-grassland":0.3552,"lcm2020-shrubland":0.0069,
"lcm2020-bare-soil-rock":0.0,"lcm2020-inland-water":0.0132,
"lcm2020-built-up-areas":0.1549,"lcm2020-not-classified":0.0,
"lcm2021-deciduous-woodland":0.1154,"lcm2021-evergreen-woodland":0.0211,
"lcm2021-cropland":0.3352,"lcm2021-grassland":0.348,"lcm2021-shrubland":0.0068,
"lcm2021-bare-soil-rock":0.0,"lcm2021-inland-water":0.0126,
"lcm2021-built-up-areas":0.1609,"lcm2021-not-classified":0.0,
"lcm2022-deciduous-woodland":0.1086,"lcm2022-evergreen-woodland":0.0211,
"lcm2022-cropland":0.3236,"lcm2022-grassland":0.3868,"lcm2022-shrubland":0.0058,
"lcm2022-bare-soil-rock":0.0011,"lcm2022-inland-water":0.0109,
"lcm2022-built-up-areas":0.1421,"lcm2022-not-classified":0.0,
"lcm2023-deciduous-woodland":0.1071,"lcm2023-evergreen-woodland":0.0213,
"lcm2023-cropland":0.3046,"lcm2023-grassland":0.4103,"lcm2023-shrubland":0.0057,
"lcm2023-bare-soil-rock":0.0009,"lcm2023-inland-water":0.0106,
"lcm2023-built-up-areas":0.1396,"lcm2023-not-classified":0.0,"high-perm-bedrock"
:0.4318,"moderate-perm-bedrock":0.0973,"low-perm-bedrock":0.2196,
"mixed-perm-bedrock":0.2513,"high-perm-superficial":0.142,"low-perm-superficial"
:0.0744,"mixed-perm-superficial":0.0717,"propwet":0.3,"bfihost":0.653,"farl":
0.942,"farl-2015":0.873,"dpsbar":42.0,"sprhost":26.94,"rmed-1d":32.7,"rmed-2d":
41.5,"rmed-1h":10.8,"ldp":269.55,"dplbar":139.87,"altbar":109,"aspbar":108,
"aspvar":0.08,"ihdtm-height":3.5,"ihdtm-catchment-area":9930.8,"bfihost19":0.679
,"bfihost19-scaled":0.676,"draindens":0.787,"mean-flood-plain-depth":1.442,
"mean-flood-plain-location":0.974,"mean-flood-plain-extent":0.1476,"urbext-1990"
:0.0426,"urbconc-1990":0.682,"urbloc-1990":0.734,"urbext-2000":0.0664,
"urbconc-2000":0.844,"urbloc-2000":0.675,"urbext-2015":0.0792,
"peak-flow-rejected-amax-years":{"excluded-years":[1987]},
"peak-flow-rejected-periods":null,"data-summary":{"data-types":[{"data-type":
"gdf","parameter":"Flow","units":"m3/s","period":"P1D","first":"1883-01-01",
"last":"2025-09-30"},{"data-type":"ndf","parameter":"Flow","units":"m3/s",
"period":"P1D","first":"1883-01-01","last":"2025-09-30"},{"data-type":"gmf",
"parameter":"Flow","units":"m3/s","period":"P1M","first":"1883-01","last":
"2026-07"},{"data-type":"nmf","parameter":"Flow","units":"m3/s","period":"P1M",
"first":"1883-01","last":"2026-07"},{"data-type":"cmr","parameter":"Rainfall",
"units":"mm","period":"P1M","first":"1891-01","last":"2026-07"},{"data-type":
"cdr","parameter":"Rainfall","units":"mm","period":"P1D","first":"1891-01-01",
"last":"2025-12-31"},{"data-type":"cdr-d","parameter":"Distance to rain gauge",
"units":"m","period":"P1D","first":"1891-01-01","last":"2025-12-31"},{
"data-type":"pot-stage","parameter":"Stage","units":"m","period":"PT15M","first"
:"1986-01-23T15:30:00","last":"2025-02-25T16:30:00"},{"data-type":"pot-flow",
"parameter":"Flow","units":"m3/s","period":"PT15M","first":"1883-01-03T00:00:00"
,"last":"2025-02-25T16:30:00"},{"data-type":"gauging-stage","parameter":"Stage",
"units":"m","period":"PT1S","first":"1988-02-10T12:00:00","last":
"2024-07-09T12:00:22"},{"data-type":"gauging-flow","parameter":"Flow","units":
"m3/s","period":"PT1S","first":"1988-02-10T12:00:00","last":
"2024-07-09T12:00:22"},{"data-type":"amax-stage","parameter":"Stage","units":"m"
,"period":"PT15M","first":"1987-04-08T14:00:00","last":"2024-11-29T04:00:00"},{
"data-type":"amax-flow","parameter":"Flow","units":"m3/s","period":"PT15M",
"first":"1883-02-16T00:00:00","last":"2024-11-29T04:00:00"}]},"licence-url":
"http://eidc.ceh.ac.uk/administration-folder/tools/ceh-standard-licence-texts/nrfa-data-terms-and-conditions-for-api-access-to-time-series-data-and-metadata/plain"
,"description-summary":
"The Thames at Kingston, replacing the d/s Teddington weir measurement structures, has one of the longest flow records associated with any UK flow gauging station. Dating from 1883, it is of major historical and modern day significance. Naturalised flows are available for the period of record. In May 2023, Kingston was recognised by the World Meteorological Organization for having more than 100 years of hydrological observations."
,"description-general":
"Until 1974 the GDFs were derived from Teddington Weir (a 150m long complex of gates, sluices, weirs and locks that span 70m across the river), where a tailwater rating was used with twice-daily levels (at low tide) to compute flows >85 cumecs. In 1974 a single path US was commissioned 2km upstream to replace the weir as the primary method for flow derivation. This was upgraded to a multi-path configuration (6 paths) US in 1986, and a second US was installed in 1991 to confirm the performance of the primary gauge. Work undertaken in 2018 to further upgrade the ultrasonics to make the station resilient to a 1-in-1000 year flood event."
,"description-station-hydrometry":
"Kingston: US (6 paths) with back-up to confirm the performance of the primary gauge. During warm weather the gauge can malfunction as the ultrasonic beam is bent by temperature gradients in the river, however this is unlikely to affect high flows but can effect gauge performance at low flows. No issues from temperature gradients have been seen in the past 20 years. Increased channel capacity means that bank-full is now very rarely exceeded and the ultrasonic gauge is capable of measuring all within bank flows. Generally, accuracy is good at peak flows, although less so for flows below 5 cumecs. Teddington Weir: Only DMFs are estimated. High hydrometric accuracy is made difficult by leakage, lockages and the general complexity of the site. Significant structural improvements have been made since 1883, but high hydrometric accuracy not achievable for the pre-1951 record. The history of flow measurement at Teddington is detailed in Chapter 6 of Hydrometry: Principles and Practices (1978), Ed. R. W. Herschy, John Wiley and Sons."
,"description-flow-record":
"Daily naturalised flows are available. Flow calculations include abstractions between Windsor and Teddington, with allowances made for leakage and lockages; however, early low flows, particularly during the 1930s and 1940s, may be underestimated. Gauged flow fell to zero during August 1976. The 1894 flood peak was reassessed in 2002, giving an estimated peak flow of 800 cumecs. Annual maxima are derived from the definitive naturalised mean daily flow series until WY1986/87, and from the annual highest instantaneous flow thereafter. Full period of record peak flow data reviewed and released in August 2026 (WINFAP Files v15)."
,"description-catchment":
"Diverse topography, geology and land use, which, together with the pattern of water utilisation, has undergone important historical changes."
,"description-flow-regime":
"Baseflow sustained mainly from the Chalk and the Oolites. Regulation from surface water and/or ground water and reservoir(s) in the catchment affect runoff. Flashy response from tributaries draining the clay dominated catchments. Some effluent derived from outside the catchment increases runoff but overall this is substantially less than major PWS and industrial/agricultural abstractions. Gw abstraction/recharge may also contribute to runoff patterns."
}]}