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

Check for flood warnings in this area

Latest recorded level 0.09m at 8:15am Wednesday 20 January 2021.

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
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Observed data

DateTime	Value	Error
2021-01-20T08:15Z	0.085	false
2021-01-20T08:00Z	0.085	false
2021-01-20T07:45Z	0.085	false
2021-01-20T07:30Z	0.085	false
2021-01-20T07:15Z	0.085	false
2021-01-20T07:00Z	0.085	false
2021-01-20T06:45Z	0.085	false
2021-01-20T06:30Z	0.085	false
2021-01-20T06:15Z	0.085	false
2021-01-20T06:00Z	0.085	false
2021-01-20T05:45Z	0.085	false
2021-01-20T05:30Z	0.086	false
2021-01-20T05:15Z	0.086	false
2021-01-20T05:00Z	0.085	false
2021-01-20T04:45Z	0.085	false
2021-01-20T04:30Z	0.086	false
2021-01-20T04:15Z	0.086	false
2021-01-20T04:00Z	0.086	false
2021-01-20T03:45Z	0.086	false
2021-01-20T03:30Z	0.087	false
2021-01-20T03:15Z	0.087	false
2021-01-20T03:00Z	0.088	false
2021-01-20T02:45Z	0.089	false
2021-01-20T02:30Z	0.089	false
2021-01-20T02:15Z	0.088	false
2021-01-20T02:00Z	0.087	false
2021-01-20T01:45Z	0.085	false
2021-01-20T01:30Z	0.085	false
2021-01-20T01:15Z	0.085	false
2021-01-20T01:00Z	0.085	false
2021-01-20T00:45Z	0.085	false
2021-01-20T00:30Z	0.085	false
2021-01-20T00:15Z	0.085	false
2021-01-20T00:00Z	0.085	false
2021-01-19T23:45Z	0.085	false
2021-01-19T23:30Z	0.085	false
2021-01-19T23:15Z	0.086	false
2021-01-19T23:00Z	0.086	false
2021-01-19T22:45Z	0.087	false
2021-01-19T22:30Z	0.087	false
2021-01-19T22:15Z	0.087	false
2021-01-19T22:00Z	0.088	false
2021-01-19T21:45Z	0.087	false
2021-01-19T21:30Z	0.088	false
2021-01-19T21:15Z	0.088	false
2021-01-19T21:00Z	0.089	false
2021-01-19T20:45Z	0.09	false
2021-01-19T20:30Z	0.092	false
2021-01-19T20:15Z	0.092	false
2021-01-19T20:00Z	0.094	false
2021-01-19T19:45Z	0.096	false
2021-01-19T19:30Z	0.103	false
2021-01-19T19:15Z	0.118	false
2021-01-19T19:00Z	0.154	false
2021-01-19T18:45Z	0.201	false
2021-01-19T18:30Z	0.205	false
2021-01-19T18:15Z	0.203	false
2021-01-19T18:00Z	0.204	false
2021-01-19T17:45Z	0.204	false
2021-01-19T17:30Z	0.204	false
2021-01-19T17:15Z	0.205	false
2021-01-19T17:00Z	0.204	false
2021-01-19T16:45Z	0.205	false
2021-01-19T16:30Z	0.204	false
2021-01-19T16:15Z	0.204	false
2021-01-19T16:00Z	0.204	false
2021-01-19T15:45Z	0.204	false
2021-01-19T15:30Z	0.204	false
2021-01-19T15:15Z	0.205	false
2021-01-19T15:00Z	0.205	false
2021-01-19T14:45Z	0.205	false
2021-01-19T14:30Z	0.206	false
2021-01-19T14:15Z	0.204	false
2021-01-19T14:00Z	0.205	false
2021-01-19T13:45Z	0.205	false
2021-01-19T13:30Z	0.206	false
2021-01-19T13:15Z	0.205	false
2021-01-19T13:00Z	0.205	false
2021-01-19T12:45Z	0.204	false
2021-01-19T12:30Z	0.251	false
2021-01-19T12:15Z	0.276	false
2021-01-19T12:00Z	0.276	false
2021-01-19T11:45Z	0.277	false
2021-01-19T11:30Z	0.277	false
2021-01-19T11:15Z	0.276	false
2021-01-19T11:00Z	0.277	false
2021-01-19T10:45Z	0.278	false
2021-01-19T10:30Z	0.277	false
2021-01-19T10:15Z	0.277	false
2021-01-19T10:00Z	0.277	false
2021-01-19T09:45Z	0.277	false
2021-01-19T09:30Z	0.277	false
2021-01-19T09:15Z	0.275	false
2021-01-19T09:00Z	0.27	false
2021-01-19T08:45Z	0.24	false
2021-01-19T08:30Z	0.167	false
2021-01-19T08:15Z	0.168	false
2021-01-19T08:00Z	0.168	false
2021-01-19T07:45Z	0.168	false
2021-01-19T07:30Z	0.169	false
2021-01-19T07:15Z	0.17	false
2021-01-19T07:00Z	0.17	false
2021-01-19T06:45Z	0.171	false
2021-01-19T06:30Z	0.172	false
2021-01-19T06:15Z	0.173	false
2021-01-19T06:00Z	0.175	false
2021-01-19T05:45Z	0.176	false
2021-01-19T05:30Z	0.176	false
2021-01-19T05:15Z	0.177	false
2021-01-19T05:00Z	0.177	false
2021-01-19T04:45Z	0.179	false
2021-01-19T04:30Z	0.183	false
2021-01-19T04:15Z	0.187	false
2021-01-19T04:00Z	0.187	false
2021-01-19T03:45Z	0.188	false
2021-01-19T03:30Z	0.191	false
2021-01-19T03:15Z	0.196	false
2021-01-19T03:00Z	0.198	false
2021-01-19T02:45Z	0.196	false
2021-01-19T02:30Z	0.181	false
2021-01-19T02:15Z	0.163	false
2021-01-19T02:00Z	0.155	false
2021-01-19T01:45Z	0.154	false
2021-01-19T01:30Z	0.154	false
2021-01-19T01:15Z	0.154	false
2021-01-19T01:00Z	0.154	false
2021-01-19T00:45Z	0.154	false
2021-01-19T00:30Z	0.154	false
2021-01-19T00:15Z	0.154	false
2021-01-19T00:00Z	0.154	false
2021-01-18T23:45Z	0.154	false
2021-01-18T23:30Z	0.154	false
2021-01-18T23:15Z	0.154	false
2021-01-18T23:00Z	0.154	false
2021-01-18T22:45Z	0.154	false
2021-01-18T22:30Z	0.154	false
2021-01-18T22:15Z	0.154	false
2021-01-18T22:00Z	0.154	false
2021-01-18T21:45Z	0.154	false
2021-01-18T21:30Z	0.155	false
2021-01-18T21:15Z	0.155	false
2021-01-18T21:00Z	0.155	false
2021-01-18T20:45Z	0.155	false
2021-01-18T20:30Z	0.155	false
2021-01-18T20:15Z	0.156	false
2021-01-18T20:00Z	0.156	false
2021-01-18T19:45Z	0.156	false
2021-01-18T19:30Z	0.157	false
2021-01-18T19:15Z	0.157	false
2021-01-18T19:00Z	0.159	false
2021-01-18T18:45Z	0.16	false
2021-01-18T18:30Z	0.162	false
2021-01-18T18:15Z	0.164	false
2021-01-18T18:00Z	0.167	false
2021-01-18T17:45Z	0.171	false
2021-01-18T17:30Z	0.181	false
2021-01-18T17:15Z	0.206	false
2021-01-18T17:00Z	0.278	false
2021-01-18T16:45Z	0.374	false
2021-01-18T16:30Z	0.378	false
2021-01-18T16:15Z	0.377	false
2021-01-18T16:00Z	0.378	false
2021-01-18T15:45Z	0.379	false
2021-01-18T15:30Z	0.379	false
2021-01-18T15:15Z	0.378	false
2021-01-18T15:00Z	0.378	false
2021-01-18T14:45Z	0.378	false
2021-01-18T14:30Z	0.376	false
2021-01-18T14:15Z	0.378	false
2021-01-18T14:00Z	0.377	false
2021-01-18T13:45Z	0.378	false
2021-01-18T13:30Z	0.377	false
2021-01-18T13:15Z	0.377	false
2021-01-18T13:00Z	0.376	false
2021-01-18T12:45Z	0.376	false
2021-01-18T12:30Z	0.375	false
2021-01-18T12:15Z	0.376	false
2021-01-18T12:00Z	0.377	false
2021-01-18T11:45Z	0.377	false
2021-01-18T11:30Z	0.376	false
2021-01-18T11:15Z	0.378	false
2021-01-18T11:00Z	0.376	false
2021-01-18T10:45Z	0.378	false
2021-01-18T10:30Z	0.377	false
2021-01-18T10:15Z	0.375	false
2021-01-18T10:00Z	0.376	false
2021-01-18T09:45Z	0.378	false
2021-01-18T09:30Z	0.378	false
2021-01-18T09:15Z	0.376	false
2021-01-18T09:00Z	0.376	false
2021-01-18T08:45Z	0.376	false
2021-01-18T08:30Z	0.374	false
2021-01-18T08:15Z	0.372	false
2021-01-18T08:00Z	0.349	false
2021-01-18T07:45Z	0.206	false
2021-01-18T07:30Z	0.156	false
2021-01-18T07:15Z	0.156	false
2021-01-18T07:00Z	0.156	false
2021-01-18T06:45Z	0.157	false
2021-01-18T06:30Z	0.157	false
2021-01-18T06:15Z	0.157	false
2021-01-18T06:00Z	0.157	false
2021-01-18T05:45Z	0.157	false
2021-01-18T05:30Z	0.157	false
2021-01-18T05:15Z	0.157	false
2021-01-18T05:00Z	0.157	false
2021-01-18T04:45Z	0.157	false
2021-01-18T04:30Z	0.158	false
2021-01-18T04:15Z	0.158	false
2021-01-18T04:00Z	0.158	false
2021-01-18T03:45Z	0.158	false
2021-01-18T03:30Z	0.159	false
2021-01-18T03:15Z	0.158	false
2021-01-18T03:00Z	0.159	false
2021-01-18T02:45Z	0.158	false
2021-01-18T02:30Z	0.159	false
2021-01-18T02:15Z	0.159	false
2021-01-18T02:00Z	0.159	false
2021-01-18T01:45Z	0.159	false
2021-01-18T01:30Z	0.159	false
2021-01-18T01:15Z	0.16	false
2021-01-18T01:00Z	0.16	false
2021-01-18T00:45Z	0.16	false
2021-01-18T00:30Z	0.16	false
2021-01-18T00:15Z	0.16	false
2021-01-18T00:00Z	0.161	false
2021-01-17T23:45Z	0.161	false
2021-01-17T23:30Z	0.161	false
2021-01-17T23:15Z	0.161	false
2021-01-17T23:00Z	0.161	false
2021-01-17T22:45Z	0.161	false
2021-01-17T22:30Z	0.161	false
2021-01-17T22:15Z	0.161	false
2021-01-17T22:00Z	0.162	false
2021-01-17T21:45Z	0.161	false
2021-01-17T21:30Z	0.162	false
2021-01-17T21:15Z	0.162	false
2021-01-17T21:00Z	0.162	false
2021-01-17T20:45Z	0.162	false
2021-01-17T20:30Z	0.163	false
2021-01-17T20:15Z	0.163	false
2021-01-17T20:00Z	0.163	false
2021-01-17T19:45Z	0.163	false
2021-01-17T19:30Z	0.163	false
2021-01-17T19:15Z	0.164	false
2021-01-17T19:00Z	0.164	false
2021-01-17T18:45Z	0.164	false
2021-01-17T18:30Z	0.164	false
2021-01-17T18:15Z	0.164	false
2021-01-17T18:00Z	0.165	false
2021-01-17T17:45Z	0.165	false
2021-01-17T17:30Z	0.165	false
2021-01-17T17:15Z	0.165	false
2021-01-17T17:00Z	0.166	false
2021-01-17T16:45Z	0.166	false
2021-01-17T16:30Z	0.166	false
2021-01-17T16:15Z	0.167	false
2021-01-17T16:00Z	0.167	false
2021-01-17T15:45Z	0.167	false
2021-01-17T15:30Z	0.167	false
2021-01-17T15:15Z	0.167	false
2021-01-17T15:00Z	0.168	false
2021-01-17T14:45Z	0.168	false
2021-01-17T14:30Z	0.168	false
2021-01-17T14:15Z	0.168	false
2021-01-17T14:00Z	0.168	false
2021-01-17T13:45Z	0.169	false
2021-01-17T13:30Z	0.169	false
2021-01-17T13:15Z	0.169	false
2021-01-17T13:00Z	0.169	false
2021-01-17T12:45Z	0.17	false
2021-01-17T12:30Z	0.17	false
2021-01-17T12:15Z	0.17	false
2021-01-17T12:00Z	0.171	false
2021-01-17T11:45Z	0.174	false
2021-01-17T11:30Z	0.175	false
2021-01-17T11:15Z	0.175	false
2021-01-17T11:00Z	0.175	false
2021-01-17T10:45Z	0.176	false
2021-01-17T10:30Z	0.176	false
2021-01-17T10:15Z	0.176	false
2021-01-17T10:00Z	0.177	false
2021-01-17T09:45Z	0.177	false
2021-01-17T09:30Z	0.178	false
2021-01-17T09:15Z	0.178	false
2021-01-17T09:00Z	0.178	false
2021-01-17T08:45Z	0.179	false
2021-01-17T08:30Z	0.179	false
2021-01-17T08:15Z	0.18	false
2021-01-17T08:00Z	0.181	false
2021-01-17T07:45Z	0.181	false
2021-01-17T07:30Z	0.181	false
2021-01-17T07:15Z	0.182	false
2021-01-17T07:00Z	0.182	false
2021-01-17T06:45Z	0.183	false
2021-01-17T06:30Z	0.183	false
2021-01-17T06:15Z	0.184	false
2021-01-17T06:00Z	0.184	false
2021-01-17T05:45Z	0.184	false
2021-01-17T05:30Z	0.185	false
2021-01-17T05:15Z	0.185	false
2021-01-17T05:00Z	0.186	false
2021-01-17T04:45Z	0.186	false
2021-01-17T04:30Z	0.187	false
2021-01-17T04:15Z	0.187	false
2021-01-17T04:00Z	0.187	false
2021-01-17T03:45Z	0.188	false
2021-01-17T03:30Z	0.189	false
2021-01-17T03:15Z	0.189	false
2021-01-17T03:00Z	0.189	false
2021-01-17T02:45Z	0.19	false
2021-01-17T02:30Z	0.19	false
2021-01-17T02:15Z	0.19	false
2021-01-17T02:00Z	0.191	false
2021-01-17T01:45Z	0.191	false
2021-01-17T01:30Z	0.192	false
2021-01-17T01:15Z	0.193	false
2021-01-17T01:00Z	0.193	false
2021-01-17T00:45Z	0.194	false
2021-01-17T00:30Z	0.194	false
2021-01-17T00:15Z	0.195	false
2021-01-17T00:00Z	0.195	false
2021-01-16T23:45Z	0.196	false
2021-01-16T23:30Z	0.196	false
2021-01-16T23:15Z	0.197	false
2021-01-16T23:00Z	0.197	false
2021-01-16T22:45Z	0.198	false
2021-01-16T22:30Z	0.199	false
2021-01-16T22:15Z	0.2	false
2021-01-16T22:00Z	0.201	false
2021-01-16T21:45Z	0.201	false
2021-01-16T21:30Z	0.202	false
2021-01-16T21:15Z	0.202	false
2021-01-16T21:00Z	0.203	false
2021-01-16T20:45Z	0.204	false
2021-01-16T20:30Z	0.204	false
2021-01-16T20:15Z	0.205	false
2021-01-16T20:00Z	0.206	false
2021-01-16T19:45Z	0.206	false
2021-01-16T19:30Z	0.207	false
2021-01-16T19:15Z	0.207	false
2021-01-16T19:00Z	0.208	false
2021-01-16T18:45Z	0.208	false
2021-01-16T18:30Z	0.209	false
2021-01-16T18:15Z	0.209	false
2021-01-16T18:00Z	0.21	false
2021-01-16T17:45Z	0.21	false
2021-01-16T17:30Z	0.211	false
2021-01-16T17:15Z	0.211	false
2021-01-16T17:00Z	0.211	false
2021-01-16T16:45Z	0.212	false
2021-01-16T16:30Z	0.213	false
2021-01-16T16:15Z	0.213	false
2021-01-16T16:00Z	0.213	false
2021-01-16T15:45Z	0.214	false
2021-01-16T15:30Z	0.215	false
2021-01-16T15:15Z	0.215	false
2021-01-16T15:00Z	0.216	false
2021-01-16T14:45Z	0.217	false
2021-01-16T14:30Z	0.218	false
2021-01-16T14:15Z	0.219	false
2021-01-16T14:00Z	0.222	false
2021-01-16T13:45Z	0.225	false
2021-01-16T13:30Z	0.225	false
2021-01-16T13:15Z	0.227	false
2021-01-16T13:00Z	0.228	false
2021-01-16T12:45Z	0.231	false
2021-01-16T12:30Z	0.233	false
2021-01-16T12:15Z	0.238	false
2021-01-16T12:00Z	0.236	false
2021-01-16T11:45Z	0.228	false
2021-01-16T11:30Z	0.221	false
2021-01-16T11:15Z	0.218	false
2021-01-16T11:00Z	0.217	false
2021-01-16T10:45Z	0.22	false
2021-01-16T10:30Z	0.222	false
2021-01-16T10:15Z	0.227	false
2021-01-16T10:00Z	0.234	false
2021-01-16T09:45Z	0.24	false
2021-01-16T09:30Z	0.24	false
2021-01-16T09:15Z	0.236	false
2021-01-16T09:00Z	0.245	false
2021-01-16T08:45Z	0.26	false
2021-01-16T08:30Z	0.27	false
2021-01-16T08:15Z	0.27	false
2021-01-16T08:00Z	0.247	false
2021-01-16T07:45Z	0.201	false
2021-01-16T07:30Z	0.174	false
2021-01-16T07:15Z	0.172	false
2021-01-16T07:00Z	0.171	false
2021-01-16T06:45Z	0.171	false
2021-01-16T06:30Z	0.168	false
2021-01-16T06:15Z	0.167	false
2021-01-16T06:00Z	0.167	false
2021-01-16T05:45Z	0.166	false
2021-01-16T05:30Z	0.166	false
2021-01-16T05:15Z	0.166	false
2021-01-16T05:00Z	0.166	false
2021-01-16T04:45Z	0.166	false
2021-01-16T04:30Z	0.167	false
2021-01-16T04:15Z	0.167	false
2021-01-16T04:00Z	0.167	false
2021-01-16T03:45Z	0.167	false
2021-01-16T03:30Z	0.168	false
2021-01-16T03:15Z	0.168	false
2021-01-16T03:00Z	0.168	false
2021-01-16T02:45Z	0.168	false
2021-01-16T02:30Z	0.169	false
2021-01-16T02:15Z	0.169	false
2021-01-16T02:00Z	0.17	false
2021-01-16T01:45Z	0.17	false
2021-01-16T01:30Z	0.171	false
2021-01-16T01:15Z	0.172	false
2021-01-16T01:00Z	0.173	false
2021-01-16T00:45Z	0.175	false
2021-01-16T00:30Z	0.178	false
2021-01-16T00:15Z	0.182	false
2021-01-16T00:00Z	0.188	false
2021-01-15T23:45Z	0.199	false
2021-01-15T23:30Z	0.231	false
2021-01-15T23:15Z	0.315	false
2021-01-15T23:00Z	0.396	false
2021-01-15T22:45Z	0.398	false
2021-01-15T22:30Z	0.398	false
2021-01-15T22:15Z	0.397	false
2021-01-15T22:00Z	0.398	false
2021-01-15T21:45Z	0.398	false
2021-01-15T21:30Z	0.398	false
2021-01-15T21:15Z	0.398	false
2021-01-15T21:00Z	0.399	false
2021-01-15T20:45Z	0.399	false
2021-01-15T20:30Z	0.398	false
2021-01-15T20:15Z	0.398	false
2021-01-15T20:00Z	0.399	false
2021-01-15T19:45Z	0.399	false
2021-01-15T19:30Z	0.399	false
2021-01-15T19:15Z	0.4	false
2021-01-15T19:00Z	0.399	false
2021-01-15T18:45Z	0.399	false
2021-01-15T18:30Z	0.4	false
2021-01-15T18:15Z	0.402	false
2021-01-15T18:00Z	0.401	false
2021-01-15T17:45Z	0.401	false
2021-01-15T17:30Z	0.4	false
2021-01-15T17:15Z	0.402	false
2021-01-15T17:00Z	0.402	false
2021-01-15T16:45Z	0.402	false
2021-01-15T16:30Z	0.401	false
2021-01-15T16:15Z	0.402	false
2021-01-15T16:00Z	0.402	false
2021-01-15T15:45Z	0.403	false
2021-01-15T15:30Z	0.403	false
2021-01-15T15:15Z	0.404	false
2021-01-15T15:00Z	0.404	false
2021-01-15T14:45Z	0.403	false
2021-01-15T14:30Z	0.403	false
2021-01-15T14:15Z	0.404	false
2021-01-15T14:00Z	0.404	false
2021-01-15T13:45Z	0.405	false
2021-01-15T13:30Z	0.404	false
2021-01-15T13:15Z	0.406	false
2021-01-15T13:00Z	0.405	false
2021-01-15T12:45Z	0.405	false
2021-01-15T12:30Z	0.405	false
2021-01-15T12:15Z	0.406	false
2021-01-15T12:00Z	0.406	false
2021-01-15T11:45Z	0.406	false
2021-01-15T11:30Z	0.407	false
2021-01-15T11:15Z	0.405	false
2021-01-15T11:00Z	0.405	false
2021-01-15T10:45Z	0.405	false
2021-01-15T10:30Z	0.404	false
2021-01-15T10:15Z	0.405	false
2021-01-15T10:00Z	0.412	false
2021-01-15T09:45Z	0.409	false
2021-01-15T09:30Z	0.412	false
2021-01-15T09:15Z	0.41	false
2021-01-15T09:00Z	0.403	false
2021-01-15T08:45Z	0.394	false
2021-01-15T08:30Z	0.353	false
2021-01-15T08:15Z	0.194	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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