River level Cannon Brook at Howletts Lane, Ruislip (TEMP)

Check for flood warnings in this area

Latest recorded level 0.16m at 9:30am Sunday 27 September 2020.

River levels at this location in the last 5 days

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• Measured level
• When the water level reaches 0.82m here, minor flooding is possible in this area
• Highest recorded level. Hide
• Show highest recorded level

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Observed data

DateTime	Value	Error
2020-09-27T08:30Z	0.161	false
2020-09-27T08:15Z	0.161	false
2020-09-27T08:00Z	0.161	false
2020-09-27T07:45Z	0.161	false
2020-09-27T07:30Z	0.161	false
2020-09-27T07:15Z	0.161	false
2020-09-27T07:00Z	0.161	false
2020-09-27T06:45Z	0.161	false
2020-09-27T06:30Z	0.161	false
2020-09-27T06:15Z	0.161	false
2020-09-27T06:00Z	0.161	false
2020-09-27T05:45Z	0.161	false
2020-09-27T05:30Z	0.161	false
2020-09-27T05:15Z	0.161	false
2020-09-27T05:00Z	0.161	false
2020-09-27T04:45Z	0.161	false
2020-09-27T04:30Z	0.161	false
2020-09-27T04:15Z	0.161	false
2020-09-27T04:00Z	0.161	false
2020-09-27T03:45Z	0.161	false
2020-09-27T03:30Z	0.161	false
2020-09-27T03:15Z	0.161	false
2020-09-27T03:00Z	0.161	false
2020-09-27T02:45Z	0.161	false
2020-09-27T02:30Z	0.161	false
2020-09-27T02:15Z	0.161	false
2020-09-27T02:00Z	0.161	false
2020-09-27T01:45Z	0.161	false
2020-09-27T01:30Z	0.161	false
2020-09-27T01:15Z	0.161	false
2020-09-27T01:00Z	0.161	false
2020-09-27T00:45Z	0.161	false
2020-09-27T00:30Z	0.161	false
2020-09-27T00:15Z	0.161	false
2020-09-27T00:00Z	0.161	false
2020-09-26T23:45Z	0.161	false
2020-09-26T23:30Z	0.161	false
2020-09-26T23:15Z	0.161	false
2020-09-26T23:00Z	0.161	false
2020-09-26T22:45Z	0.161	false
2020-09-26T22:30Z	0.161	false
2020-09-26T22:15Z	0.161	false
2020-09-26T22:00Z	0.161	false
2020-09-26T21:45Z	0.161	false
2020-09-26T21:30Z	0.161	false
2020-09-26T21:15Z	0.161	false
2020-09-26T21:00Z	0.161	false
2020-09-26T20:45Z	0.161	false
2020-09-26T20:30Z	0.161	false
2020-09-26T20:15Z	0.161	false
2020-09-26T20:00Z	0.161	false
2020-09-26T19:45Z	0.161	false
2020-09-26T19:30Z	0.161	false
2020-09-26T19:15Z	0.161	false
2020-09-26T19:00Z	0.161	false
2020-09-26T18:45Z	0.161	false
2020-09-26T18:30Z	0.161	false
2020-09-26T18:15Z	0.161	false
2020-09-26T18:00Z	0.161	false
2020-09-26T17:45Z	0.161	false
2020-09-26T17:30Z	0.161	false
2020-09-26T17:15Z	0.161	false
2020-09-26T17:00Z	0.161	false
2020-09-26T16:45Z	0.161	false
2020-09-26T16:30Z	0.161	false
2020-09-26T16:15Z	0.161	false
2020-09-26T16:00Z	0.16	false
2020-09-26T15:45Z	0.16	false
2020-09-26T15:30Z	0.161	false
2020-09-26T15:15Z	0.16	false
2020-09-26T15:00Z	0.161	false
2020-09-26T14:45Z	0.161	false
2020-09-26T14:30Z	0.161	false
2020-09-26T14:15Z	0.16	false
2020-09-26T14:00Z	0.161	false
2020-09-26T13:45Z	0.16	false
2020-09-26T13:30Z	0.161	false
2020-09-26T13:15Z	0.161	false
2020-09-26T13:00Z	0.161	false
2020-09-26T12:45Z	0.161	false
2020-09-26T12:30Z	0.161	false
2020-09-26T12:15Z	0.161	false
2020-09-26T12:00Z	0.161	false
2020-09-26T11:45Z	0.161	false
2020-09-26T11:30Z	0.161	false
2020-09-26T11:15Z	0.161	false
2020-09-26T11:00Z	0.161	false
2020-09-26T10:45Z	0.161	false
2020-09-26T10:30Z	0.162	false
2020-09-26T10:15Z	0.163	false
2020-09-26T10:00Z	0.163	false
2020-09-26T09:45Z	0.163	false
2020-09-26T09:30Z	0.163	false
2020-09-26T09:15Z	0.163	false
2020-09-26T09:00Z	0.163	false
2020-09-26T08:45Z	0.162	false
2020-09-26T08:30Z	0.162	false
2020-09-26T08:15Z	0.163	false
2020-09-26T08:00Z	0.162	false
2020-09-26T07:45Z	0.162	false
2020-09-26T07:30Z	0.162	false
2020-09-26T07:15Z	0.162	false
2020-09-26T07:00Z	0.162	false
2020-09-26T06:45Z	0.162	false
2020-09-26T06:30Z	0.162	false
2020-09-26T06:15Z	0.162	false
2020-09-26T06:00Z	0.162	false
2020-09-26T05:45Z	0.162	false
2020-09-26T05:30Z	0.162	false
2020-09-26T05:15Z	0.162	false
2020-09-26T05:00Z	0.162	false
2020-09-26T04:45Z	0.162	false
2020-09-26T04:30Z	0.161	false
2020-09-26T04:15Z	0.161	false
2020-09-26T04:00Z	0.161	false
2020-09-26T03:45Z	0.161	false
2020-09-26T03:30Z	0.16	false
2020-09-26T03:15Z	0.16	false
2020-09-26T03:00Z	0.16	false
2020-09-26T02:45Z	0.16	false
2020-09-26T02:30Z	0.16	false
2020-09-26T02:15Z	0.16	false
2020-09-26T02:00Z	0.16	false
2020-09-26T01:45Z	0.16	false
2020-09-26T01:30Z	0.16	false
2020-09-26T01:15Z	0.16	false
2020-09-26T01:00Z	0.16	false
2020-09-26T00:45Z	0.16	false
2020-09-26T00:30Z	0.16	false
2020-09-26T00:15Z	0.16	false
2020-09-26T00:00Z	0.159	false
2020-09-25T23:45Z	0.159	false
2020-09-25T23:30Z	0.159	false
2020-09-25T23:15Z	0.159	false
2020-09-25T23:00Z	0.159	false
2020-09-25T22:45Z	0.159	false
2020-09-25T22:30Z	0.159	false
2020-09-25T22:15Z	0.158	false
2020-09-25T22:00Z	0.158	false
2020-09-25T21:45Z	0.159	false
2020-09-25T21:30Z	0.159	false
2020-09-25T21:15Z	0.159	false
2020-09-25T21:00Z	0.158	false
2020-09-25T20:45Z	0.158	false
2020-09-25T20:30Z	0.158	false
2020-09-25T20:15Z	0.159	false
2020-09-25T20:00Z	0.158	false
2020-09-25T19:45Z	0.158	false
2020-09-25T19:30Z	0.158	false
2020-09-25T19:15Z	0.158	false
2020-09-25T19:00Z	0.158	false
2020-09-25T18:45Z	0.158	false
2020-09-25T18:30Z	0.158	false
2020-09-25T18:15Z	0.158	false
2020-09-25T18:00Z	0.158	false
2020-09-25T17:45Z	0.158	false
2020-09-25T17:30Z	0.158	false
2020-09-25T17:15Z	0.158	false
2020-09-25T17:00Z	0.157	false
2020-09-25T16:45Z	0.157	false
2020-09-25T16:30Z	0.159	false
2020-09-25T16:15Z	0.158	false
2020-09-25T16:00Z	0.158	false
2020-09-25T15:45Z	0.158	false
2020-09-25T15:30Z	0.158	false
2020-09-25T15:15Z	0.158	false
2020-09-25T15:00Z	0.158	false
2020-09-25T14:45Z	0.158	false
2020-09-25T14:30Z	0.157	false
2020-09-25T14:15Z	0.158	false
2020-09-25T14:00Z	0.158	false
2020-09-25T13:45Z	0.159	false
2020-09-25T13:30Z	0.159	false
2020-09-25T13:15Z	0.159	false
2020-09-25T13:00Z	0.159	false
2020-09-25T12:45Z	0.159	false
2020-09-25T12:30Z	0.16	false
2020-09-25T12:15Z	0.159	false
2020-09-25T12:00Z	0.16	false
2020-09-25T11:45Z	0.16	false
2020-09-25T11:30Z	0.16	false
2020-09-25T11:15Z	0.16	false
2020-09-25T11:00Z	0.159	false
2020-09-25T10:45Z	0.159	false
2020-09-25T10:30Z	0.159	false
2020-09-25T10:15Z	0.16	false
2020-09-25T10:00Z	0.159	false
2020-09-25T09:45Z	0.16	false
2020-09-25T09:30Z	0.16	false
2020-09-25T09:15Z	0.16	false
2020-09-25T09:00Z	0.16	false
2020-09-25T08:45Z	0.16	false
2020-09-25T08:30Z	0.16	false
2020-09-25T08:15Z	0.161	false
2020-09-25T08:00Z	0.161	false
2020-09-25T07:45Z	0.161	false
2020-09-25T07:30Z	0.161	false
2020-09-25T07:15Z	0.16	false
2020-09-25T07:00Z	0.159	false
2020-09-25T06:45Z	0.159	false
2020-09-25T06:30Z	0.159	false
2020-09-25T06:15Z	0.159	false
2020-09-25T06:00Z	0.159	false
2020-09-25T05:45Z	0.159	false
2020-09-25T05:30Z	0.159	false
2020-09-25T05:15Z	0.158	false
2020-09-25T05:00Z	0.158	false
2020-09-25T04:45Z	0.159	false
2020-09-25T04:30Z	0.158	false
2020-09-25T04:15Z	0.159	false
2020-09-25T04:00Z	0.159	false
2020-09-25T03:45Z	0.159	false
2020-09-25T03:30Z	0.159	false
2020-09-25T03:15Z	0.159	false
2020-09-25T03:00Z	0.159	false
2020-09-25T02:45Z	0.159	false
2020-09-25T02:30Z	0.159	false
2020-09-25T02:15Z	0.159	false
2020-09-25T02:00Z	0.159	false
2020-09-25T01:45Z	0.159	false
2020-09-25T01:30Z	0.159	false
2020-09-25T01:15Z	0.159	false
2020-09-25T01:00Z	0.159	false
2020-09-25T00:45Z	0.159	false
2020-09-25T00:30Z	0.159	false
2020-09-25T00:15Z	0.159	false
2020-09-25T00:00Z	0.159	false
2020-09-24T23:45Z	0.159	false
2020-09-24T23:30Z	0.16	false
2020-09-24T23:15Z	0.16	false
2020-09-24T23:00Z	0.16	false
2020-09-24T22:45Z	0.16	false
2020-09-24T22:30Z	0.16	false
2020-09-24T22:15Z	0.16	false
2020-09-24T22:00Z	0.16	false
2020-09-24T21:45Z	0.16	false
2020-09-24T21:30Z	0.16	false
2020-09-24T21:15Z	0.16	false
2020-09-24T21:00Z	0.16	false
2020-09-24T20:45Z	0.16	false
2020-09-24T20:30Z	0.161	false
2020-09-24T20:15Z	0.161	false
2020-09-24T20:00Z	0.16	false
2020-09-24T19:45Z	0.16	false
2020-09-24T19:30Z	0.161	false
2020-09-24T19:15Z	0.161	false
2020-09-24T19:00Z	0.161	false
2020-09-24T18:45Z	0.161	false
2020-09-24T18:30Z	0.161	false
2020-09-24T18:15Z	0.161	false
2020-09-24T18:00Z	0.161	false
2020-09-24T17:45Z	0.161	false
2020-09-24T17:30Z	0.161	false
2020-09-24T17:15Z	0.161	false
2020-09-24T17:00Z	0.162	false
2020-09-24T16:45Z	0.162	false
2020-09-24T16:30Z	0.162	false
2020-09-24T16:15Z	0.162	false
2020-09-24T16:00Z	0.163	false
2020-09-24T15:45Z	0.163	false
2020-09-24T15:30Z	0.163	false
2020-09-24T15:15Z	0.164	false
2020-09-24T15:00Z	0.164	false
2020-09-24T14:45Z	0.166	false
2020-09-24T14:30Z	0.167	false
2020-09-24T14:15Z	0.168	false
2020-09-24T14:00Z	0.164	false
2020-09-24T13:45Z	0.166	false
2020-09-24T13:30Z	0.169	false
2020-09-24T13:15Z	0.169	false
2020-09-24T13:00Z	0.164	false
2020-09-24T12:45Z	0.161	false
2020-09-24T12:30Z	0.162	false
2020-09-24T12:15Z	0.162	false
2020-09-24T12:00Z	0.162	false
2020-09-24T11:45Z	0.162	false
2020-09-24T11:30Z	0.161	false
2020-09-24T11:15Z	0.162	false
2020-09-24T11:00Z	0.162	false
2020-09-24T10:45Z	0.163	false
2020-09-24T10:30Z	0.163	false
2020-09-24T10:15Z	0.163	false
2020-09-24T10:00Z	0.164	false
2020-09-24T09:45Z	0.164	false
2020-09-24T09:30Z	0.164	false
2020-09-24T09:15Z	0.164	false
2020-09-24T09:00Z	0.165	false
2020-09-24T08:45Z	0.165	false
2020-09-24T08:30Z	0.166	false
2020-09-24T08:15Z	0.166	false
2020-09-24T08:00Z	0.167	false
2020-09-24T07:45Z	0.168	false
2020-09-24T07:30Z	0.169	false
2020-09-24T07:15Z	0.17	false
2020-09-24T07:00Z	0.172	false
2020-09-24T06:45Z	0.173	false
2020-09-24T06:30Z	0.175	false
2020-09-24T06:15Z	0.179	false
2020-09-24T06:00Z	0.184	false
2020-09-24T05:45Z	0.195	false
2020-09-24T05:30Z	0.185	false
2020-09-24T05:15Z	0.205	false
2020-09-24T05:00Z	0.181	false
2020-09-24T04:45Z	0.162	false
2020-09-24T04:30Z	0.16	false
2020-09-24T04:15Z	0.16	false
2020-09-24T04:00Z	0.161	false
2020-09-24T03:45Z	0.161	false
2020-09-24T03:30Z	0.161	false
2020-09-24T03:15Z	0.161	false
2020-09-24T03:00Z	0.161	false
2020-09-24T02:45Z	0.161	false
2020-09-24T02:30Z	0.161	false
2020-09-24T02:15Z	0.162	false
2020-09-24T02:00Z	0.162	false
2020-09-24T01:45Z	0.162	false
2020-09-24T01:30Z	0.163	false
2020-09-24T01:15Z	0.164	false
2020-09-24T01:00Z	0.164	false
2020-09-24T00:45Z	0.164	false
2020-09-24T00:30Z	0.164	false
2020-09-24T00:15Z	0.165	false
2020-09-24T00:00Z	0.165	false
2020-09-23T23:45Z	0.166	false
2020-09-23T23:30Z	0.167	false
2020-09-23T23:15Z	0.168	false
2020-09-23T23:00Z	0.168	false
2020-09-23T22:45Z	0.169	false
2020-09-23T22:30Z	0.17	false
2020-09-23T22:15Z	0.171	false
2020-09-23T22:00Z	0.172	false
2020-09-23T21:45Z	0.174	false
2020-09-23T21:30Z	0.176	false
2020-09-23T21:15Z	0.178	false
2020-09-23T21:00Z	0.181	false
2020-09-23T20:45Z	0.185	false
2020-09-23T20:30Z	0.191	false
2020-09-23T20:15Z	0.196	false
2020-09-23T20:00Z	0.207	false
2020-09-23T19:45Z	0.229	false
2020-09-23T19:30Z	0.269	false
2020-09-23T19:15Z	0.261	false
2020-09-23T19:00Z	0.248	false
2020-09-23T18:45Z	0.171	false
2020-09-23T18:30Z	0.173	false
2020-09-23T18:15Z	0.175	false
2020-09-23T18:00Z	0.178	false
2020-09-23T17:45Z	0.182	false
2020-09-23T17:30Z	0.187	false
2020-09-23T17:15Z	0.194	false
2020-09-23T17:00Z	0.209	false
2020-09-23T16:45Z	0.233	false
2020-09-23T16:30Z	0.225	false
2020-09-23T16:15Z	0.192	false
2020-09-23T16:00Z	0.183	false
2020-09-23T15:45Z	0.191	false
2020-09-23T15:30Z	0.2	false
2020-09-23T15:15Z	0.211	false
2020-09-23T15:00Z	0.252	false
2020-09-23T14:45Z	0.296	false
2020-09-23T14:30Z	0.415	false
2020-09-23T14:15Z	0.167	false
2020-09-23T14:00Z	0.167	false
2020-09-23T13:45Z	0.167	false
2020-09-23T13:30Z	0.167	false
2020-09-23T13:15Z	0.168	false
2020-09-23T13:00Z	0.168	false
2020-09-23T12:45Z	0.167	false
2020-09-23T12:30Z	0.167	false
2020-09-23T12:15Z	0.168	false
2020-09-23T12:00Z	0.167	false
2020-09-23T11:45Z	0.167	false
2020-09-23T11:30Z	0.167	false
2020-09-23T11:15Z	0.167	false
2020-09-23T11:00Z	0.167	false
2020-09-23T10:45Z	0.167	false
2020-09-23T10:30Z	0.167	false
2020-09-23T10:15Z	0.167	false
2020-09-23T10:00Z	0.168	false
2020-09-23T09:45Z	0.168	false
2020-09-23T09:30Z	0.168	false
2020-09-23T09:15Z	0.168	false
2020-09-23T09:00Z	0.168	false
2020-09-23T08:45Z	0.168	false
2020-09-23T08:30Z	0.169	false
2020-09-23T08:15Z	0.169	false
2020-09-23T08:00Z	0.169	false
2020-09-23T07:45Z	0.17	false
2020-09-23T07:30Z	0.171	false
2020-09-23T07:15Z	0.171	false
2020-09-23T07:00Z	0.172	false
2020-09-23T06:45Z	0.173	false
2020-09-23T06:30Z	0.174	false
2020-09-23T06:15Z	0.176	false
2020-09-23T06:00Z	0.178	false
2020-09-23T05:45Z	0.181	false
2020-09-23T05:30Z	0.186	false
2020-09-23T05:15Z	0.193	false
2020-09-23T05:00Z	0.184	false
2020-09-23T04:45Z	0.189	false
2020-09-23T04:30Z	0.194	false
2020-09-23T04:15Z	0.189	false
2020-09-23T04:00Z	0.181	false
2020-09-23T03:45Z	0.181	false
2020-09-23T03:30Z	0.18	false
2020-09-23T03:15Z	0.18	false
2020-09-23T03:00Z	0.181	false
2020-09-23T02:45Z	0.177	false
2020-09-23T02:30Z	0.176	false
2020-09-23T02:15Z	0.176	false
2020-09-23T02:00Z	0.176	false
2020-09-23T01:45Z	0.176	false
2020-09-23T01:30Z	0.176	false
2020-09-23T01:15Z	0.176	false
2020-09-23T01:00Z	0.176	false
2020-09-23T00:45Z	0.176	false
2020-09-23T00:30Z	0.176	false
2020-09-23T00:15Z	0.175	false
2020-09-23T00:00Z	0.175	false
2020-09-22T23:45Z	0.175	false
2020-09-22T23:30Z	0.175	false
2020-09-22T23:15Z	0.175	false
2020-09-22T23:00Z	0.175	false
2020-09-22T22:45Z	0.175	false
2020-09-22T22:30Z	0.175	false
2020-09-22T22:15Z	0.175	false
2020-09-22T22:00Z	0.175	false
2020-09-22T21:45Z	0.175	false
2020-09-22T21:30Z	0.175	false
2020-09-22T21:15Z	0.175	false
2020-09-22T21:00Z	0.175	false
2020-09-22T20:45Z	0.175	false
2020-09-22T20:30Z	0.175	false
2020-09-22T20:15Z	0.175	false
2020-09-22T20:00Z	0.175	false
2020-09-22T19:45Z	0.175	false
2020-09-22T19:30Z	0.175	false
2020-09-22T19:15Z	0.175	false
2020-09-22T19:00Z	0.174	false
2020-09-22T18:45Z	0.174	false
2020-09-22T18:30Z	0.174	false
2020-09-22T18:15Z	0.174	false
2020-09-22T18:00Z	0.174	false
2020-09-22T17:45Z	0.174	false
2020-09-22T17:30Z	0.175	false
2020-09-22T17:15Z	0.174	false
2020-09-22T17:00Z	0.175	false
2020-09-22T16:45Z	0.174	false
2020-09-22T16:30Z	0.175	false
2020-09-22T16:15Z	0.175	false
2020-09-22T16:00Z	0.175	false
2020-09-22T15:45Z	0.175	false
2020-09-22T15:30Z	0.175	false
2020-09-22T15:15Z	0.175	false
2020-09-22T15:00Z	0.175	false
2020-09-22T14:45Z	0.175	false
2020-09-22T14:30Z	0.175	false
2020-09-22T14:15Z	0.174	false
2020-09-22T14:00Z	0.175	false
2020-09-22T13:45Z	0.175	false
2020-09-22T13:30Z	0.175	false
2020-09-22T13:15Z	0.175	false
2020-09-22T13:00Z	0.175	false
2020-09-22T12:45Z	0.174	false
2020-09-22T12:30Z	0.175	false
2020-09-22T12:15Z	0.175	false
2020-09-22T12:00Z	0.175	false
2020-09-22T11:45Z	0.175	false
2020-09-22T11:30Z	0.175	false
2020-09-22T11:15Z	0.175	false
2020-09-22T11:00Z	0.175	false
2020-09-22T10:45Z	0.175	false
2020-09-22T10:30Z	0.175	false
2020-09-22T10:15Z	0.175	false
2020-09-22T10:00Z	0.175	false
2020-09-22T09:45Z	0.175	false
2020-09-22T09:30Z	0.175	false
2020-09-22T09:15Z	0.175	false
2020-09-22T09:00Z	0.175	false
2020-09-22T08:45Z	0.175	false
2020-09-22T08:30Z	0.175	false

Forecast data

Key information

• Station name: Howletts Lane, Ruislip (TEMP)
• Station ID: 9307
• River name: Cannon Brook
• Typical range: 0.02m to 0.82m
• Highest level on record: 1.05m on 15 October 2018
• Site datum: 40.98mAOD (what does this mean?)

How are river levels measured?

The Environment agency uses a network of monitoring stations across the country. Each one has its own datum - a height in metres fixed relative to mean sea level. This height is expressed as metres above ordnance datum (mAOD). The river levels we provide for each monitoring station are all relative to its site datum.

If we didn't do this, we'd show some very high measurements, which could cause confusion. By using a local site datum, the river levels are easier to understand, especially by users familiar with the data from a particular monitoring station.

A river's height above ordnance datum can be seen by adding the site datum to the river level.

How often are river levels measured?

We use measuring stations like this one to collect water level data, usually once or twice a day. We collect data more frequently when there's a greater risk of flooding. That's why the graph might show a short time lag since the last measurement.

How might river levels affect flood risk?

Typical range

This is the usual range of river levels at this station, based on historical data.

Above typical

This means that flooding is possible because river levels at this station are currently higher than usual.
Many factors can influence the possibility of flooding - river levels are only one indicator. Always check if there's a flood warning in place at a particular location.

Below typical

This means that river levels at this station are currently lower than usual.
Drought or water management measures may be in place. Please check for the latest information on water resources and restrictions in your area.

• View nearby measuring stations

• View the flood information service for England
• Check the long term flood risk for an area in England.

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