River level River Bulbourne at Hemel Hempstead, Old Fishery Lane

Check for flood warnings in this area

Latest recorded level 0.63m at 4:30am Wednesday 13 November 2019.

River levels at this location in the last 5 days

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• Measured level
• When the water level reaches 1.80m 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
2019-11-13T04:30Z	0.625	false
2019-11-13T04:15Z	0.625	false
2019-11-13T04:00Z	0.625	false
2019-11-13T03:45Z	0.625	false
2019-11-13T03:30Z	0.625	false
2019-11-13T03:15Z	0.625	false
2019-11-13T03:00Z	0.625	false
2019-11-13T02:45Z	0.625	false
2019-11-13T02:30Z	0.625	false
2019-11-13T02:15Z	0.625	false
2019-11-13T02:00Z	0.626	false
2019-11-13T01:45Z	0.626	false
2019-11-13T01:30Z	0.626	false
2019-11-13T01:15Z	0.626	false
2019-11-13T01:00Z	0.626	false
2019-11-13T00:45Z	0.627	false
2019-11-13T00:30Z	0.627	false
2019-11-13T00:15Z	0.627	false
2019-11-13T00:00Z	0.627	false
2019-11-12T23:45Z	0.627	false
2019-11-12T23:30Z	0.628	false
2019-11-12T23:15Z	0.629	false
2019-11-12T23:00Z	0.629	false
2019-11-12T22:45Z	0.63	false
2019-11-12T22:30Z	0.63	false
2019-11-12T22:15Z	0.631	false
2019-11-12T22:00Z	0.631	false
2019-11-12T21:45Z	0.632	false
2019-11-12T21:30Z	0.633	false
2019-11-12T21:15Z	0.633	false
2019-11-12T21:00Z	0.634	false
2019-11-12T20:45Z	0.634	false
2019-11-12T20:30Z	0.634	false
2019-11-12T20:15Z	0.634	false
2019-11-12T20:00Z	0.635	false
2019-11-12T19:45Z	0.635	false
2019-11-12T19:30Z	0.635	false
2019-11-12T19:15Z	0.634	false
2019-11-12T19:00Z	0.635	false
2019-11-12T18:45Z	0.633	false
2019-11-12T18:30Z	0.632	false
2019-11-12T18:15Z	0.629	false
2019-11-12T18:00Z	0.625	false
2019-11-12T17:45Z	0.621	false
2019-11-12T17:30Z	0.619	false
2019-11-12T17:15Z	0.618	false
2019-11-12T17:00Z	0.617	false
2019-11-12T16:45Z	0.617	false
2019-11-12T16:30Z	0.616	false
2019-11-12T16:15Z	0.616	false
2019-11-12T16:00Z	0.615	false
2019-11-12T15:45Z	0.615	false
2019-11-12T15:30Z	0.615	false
2019-11-12T15:15Z	0.614	false
2019-11-12T15:00Z	0.614	false
2019-11-12T14:45Z	0.614	false
2019-11-12T14:30Z	0.615	false
2019-11-12T14:15Z	0.615	false
2019-11-12T14:00Z	0.616	false
2019-11-12T13:45Z	0.616	false
2019-11-12T13:30Z	0.616	false
2019-11-12T13:15Z	0.616	false
2019-11-12T13:00Z	0.616	false
2019-11-12T12:45Z	0.618	false
2019-11-12T12:30Z	0.619	false
2019-11-12T12:15Z	0.619	false
2019-11-12T12:00Z	0.62	false
2019-11-12T11:45Z	0.621	false
2019-11-12T11:30Z	0.622	false
2019-11-12T11:15Z	0.623	false
2019-11-12T11:00Z	0.625	false
2019-11-12T10:45Z	0.625	false
2019-11-12T10:30Z	0.626	false
2019-11-12T10:15Z	0.626	false
2019-11-12T10:00Z	0.626	false
2019-11-12T09:45Z	0.626	false
2019-11-12T09:30Z	0.626	false
2019-11-12T09:15Z	0.627	false
2019-11-12T09:00Z	0.627	false
2019-11-12T08:45Z	0.627	false
2019-11-12T08:30Z	0.628	false
2019-11-12T08:15Z	0.628	false
2019-11-12T08:00Z	0.628	false
2019-11-12T07:45Z	0.628	false
2019-11-12T07:30Z	0.628	false
2019-11-12T07:15Z	0.628	false
2019-11-12T07:00Z	0.629	false
2019-11-12T06:45Z	0.629	false
2019-11-12T06:30Z	0.628	false
2019-11-12T06:15Z	0.629	false
2019-11-12T06:00Z	0.629	false
2019-11-12T05:45Z	0.629	false
2019-11-12T05:30Z	0.629	false
2019-11-12T05:15Z	0.629	false
2019-11-12T05:00Z	0.629	false
2019-11-12T04:45Z	0.629	false
2019-11-12T04:30Z	0.629	false
2019-11-12T04:30Z	0.629	false
2019-11-12T04:15Z	0.63	false
2019-11-12T04:15Z	0.63	false
2019-11-12T04:00Z	0.63	false
2019-11-12T04:00Z	0.63	false
2019-11-12T03:45Z	0.629	false
2019-11-12T03:45Z	0.629	false
2019-11-12T03:30Z	0.63	false
2019-11-12T03:30Z	0.63	false
2019-11-12T03:15Z	0.63	false
2019-11-12T03:15Z	0.63	false
2019-11-12T03:00Z	0.629	false
2019-11-12T03:00Z	0.629	false
2019-11-12T02:45Z	0.63	false
2019-11-12T02:45Z	0.63	false
2019-11-12T02:30Z	0.63	false
2019-11-12T02:30Z	0.63	false
2019-11-12T02:15Z	0.63	false
2019-11-12T02:15Z	0.63	false
2019-11-12T02:00Z	0.63	false
2019-11-12T02:00Z	0.63	false
2019-11-12T01:45Z	0.63	false
2019-11-12T01:45Z	0.63	false
2019-11-12T01:30Z	0.631	false
2019-11-12T01:30Z	0.631	false
2019-11-12T01:15Z	0.631	false
2019-11-12T01:15Z	0.631	false
2019-11-12T01:00Z	0.631	false
2019-11-12T01:00Z	0.631	false
2019-11-12T00:45Z	0.632	false
2019-11-12T00:45Z	0.632	false
2019-11-12T00:30Z	0.633	false
2019-11-12T00:30Z	0.633	false
2019-11-12T00:15Z	0.632	false
2019-11-12T00:15Z	0.632	false
2019-11-12T00:00Z	0.633	false
2019-11-12T00:00Z	0.633	false
2019-11-11T23:45Z	0.634	false
2019-11-11T23:45Z	0.634	false
2019-11-11T23:30Z	0.634	false
2019-11-11T23:30Z	0.634	false
2019-11-11T23:15Z	0.634	false
2019-11-11T23:15Z	0.634	false
2019-11-11T23:00Z	0.635	false
2019-11-11T23:00Z	0.635	false
2019-11-11T22:45Z	0.636	false
2019-11-11T22:45Z	0.636	false
2019-11-11T22:30Z	0.635	false
2019-11-11T22:30Z	0.635	false
2019-11-11T22:15Z	0.636	false
2019-11-11T22:15Z	0.636	false
2019-11-11T22:00Z	0.635	false
2019-11-11T22:00Z	0.635	false
2019-11-11T21:45Z	0.633	false
2019-11-11T21:45Z	0.633	false
2019-11-11T21:30Z	0.632	false
2019-11-11T21:30Z	0.632	false
2019-11-11T21:15Z	0.63	false
2019-11-11T21:15Z	0.63	false
2019-11-11T21:00Z	0.629	false
2019-11-11T21:00Z	0.629	false
2019-11-11T20:45Z	0.628	false
2019-11-11T20:45Z	0.628	false
2019-11-11T20:30Z	0.628	false
2019-11-11T20:30Z	0.628	false
2019-11-11T20:15Z	0.628	false
2019-11-11T20:15Z	0.628	false
2019-11-11T20:00Z	0.628	false
2019-11-11T20:00Z	0.628	false
2019-11-11T19:45Z	0.628	false
2019-11-11T19:45Z	0.628	false
2019-11-11T19:30Z	0.629	false
2019-11-11T19:30Z	0.629	false
2019-11-11T19:15Z	0.629	false
2019-11-11T19:15Z	0.629	false
2019-11-11T19:00Z	0.63	false
2019-11-11T19:00Z	0.63	false
2019-11-11T18:45Z	0.631	false
2019-11-11T18:45Z	0.631	false
2019-11-11T18:30Z	0.631	false
2019-11-11T18:30Z	0.631	false
2019-11-11T18:15Z	0.631	false
2019-11-11T18:15Z	0.631	false
2019-11-11T18:00Z	0.633	false
2019-11-11T18:00Z	0.633	false
2019-11-11T17:45Z	0.633	false
2019-11-11T17:45Z	0.633	false
2019-11-11T17:30Z	0.633	false
2019-11-11T17:30Z	0.633	false
2019-11-11T17:15Z	0.635	false
2019-11-11T17:15Z	0.635	false
2019-11-11T17:00Z	0.635	false
2019-11-11T17:00Z	0.635	false
2019-11-11T16:45Z	0.636	false
2019-11-11T16:45Z	0.636	false
2019-11-11T16:30Z	0.636	false
2019-11-11T16:30Z	0.636	false
2019-11-11T16:15Z	0.637	false
2019-11-11T16:15Z	0.637	false
2019-11-11T16:00Z	0.637	false
2019-11-11T16:00Z	0.637	false
2019-11-11T15:45Z	0.637	false
2019-11-11T15:45Z	0.637	false
2019-11-11T15:30Z	0.637	false
2019-11-11T15:30Z	0.637	false
2019-11-11T15:15Z	0.637	false
2019-11-11T15:15Z	0.637	false
2019-11-11T15:00Z	0.637	false
2019-11-11T15:00Z	0.637	false
2019-11-11T14:45Z	0.636	false
2019-11-11T14:45Z	0.636	false
2019-11-11T14:30Z	0.636	false
2019-11-11T14:30Z	0.636	false
2019-11-11T14:15Z	0.637	false
2019-11-11T14:15Z	0.637	false
2019-11-11T14:00Z	0.637	false
2019-11-11T14:00Z	0.637	false
2019-11-11T13:45Z	0.637	false
2019-11-11T13:45Z	0.637	false
2019-11-11T13:30Z	0.638	false
2019-11-11T13:30Z	0.638	false
2019-11-11T13:15Z	0.637	false
2019-11-11T13:15Z	0.637	false
2019-11-11T13:00Z	0.633	false
2019-11-11T13:00Z	0.633	false
2019-11-11T12:45Z	0.632	false
2019-11-11T12:45Z	0.632	false
2019-11-11T12:30Z	0.633	false
2019-11-11T12:30Z	0.633	false
2019-11-11T12:15Z	0.633	false
2019-11-11T12:15Z	0.633	false
2019-11-11T12:00Z	0.633	false
2019-11-11T12:00Z	0.633	false
2019-11-11T11:45Z	0.633	false
2019-11-11T11:45Z	0.633	false
2019-11-11T11:30Z	0.633	false
2019-11-11T11:30Z	0.633	false
2019-11-11T11:15Z	0.632	false
2019-11-11T11:15Z	0.632	false
2019-11-11T11:00Z	0.631	false
2019-11-11T11:00Z	0.631	false
2019-11-11T10:45Z	0.63	false
2019-11-11T10:45Z	0.63	false
2019-11-11T10:30Z	0.631	false
2019-11-11T10:30Z	0.631	false
2019-11-11T10:15Z	0.631	false
2019-11-11T10:15Z	0.631	false
2019-11-11T10:00Z	0.632	false
2019-11-11T10:00Z	0.632	false
2019-11-11T09:45Z	0.632	false
2019-11-11T09:45Z	0.632	false
2019-11-11T09:30Z	0.632	false
2019-11-11T09:30Z	0.632	false
2019-11-11T09:15Z	0.632	false
2019-11-11T09:15Z	0.632	false
2019-11-11T09:00Z	0.632	false
2019-11-11T09:00Z	0.632	false
2019-11-11T08:45Z	0.633	false
2019-11-11T08:45Z	0.633	false
2019-11-11T08:30Z	0.633	false
2019-11-11T08:30Z	0.633	false
2019-11-11T08:15Z	0.634	false
2019-11-11T08:15Z	0.634	false
2019-11-11T08:00Z	0.635	false
2019-11-11T08:00Z	0.635	false
2019-11-11T07:45Z	0.636	false
2019-11-11T07:45Z	0.636	false
2019-11-11T07:30Z	0.637	false
2019-11-11T07:30Z	0.637	false
2019-11-11T07:15Z	0.639	false
2019-11-11T07:15Z	0.639	false
2019-11-11T07:00Z	0.641	false
2019-11-11T07:00Z	0.641	false
2019-11-11T06:45Z	0.642	false
2019-11-11T06:45Z	0.642	false
2019-11-11T06:30Z	0.643	false
2019-11-11T06:30Z	0.643	false
2019-11-11T06:15Z	0.645	false
2019-11-11T06:15Z	0.645	false
2019-11-11T06:00Z	0.649	false
2019-11-11T06:00Z	0.649	false
2019-11-11T05:45Z	0.653	false
2019-11-11T05:45Z	0.653	false
2019-11-11T05:30Z	0.661	false
2019-11-11T05:30Z	0.661	false
2019-11-11T05:15Z	0.671	false
2019-11-11T05:15Z	0.671	false
2019-11-11T05:00Z	0.681	false
2019-11-11T05:00Z	0.681	false
2019-11-11T04:45Z	0.693	false
2019-11-11T04:45Z	0.693	false
2019-11-11T04:30Z	0.688	false
2019-11-11T04:15Z	0.69	false
2019-11-11T04:00Z	0.687	false
2019-11-11T03:45Z	0.687	false
2019-11-11T03:30Z	0.667	false
2019-11-11T03:15Z	0.637	false
2019-11-11T03:00Z	0.636	false
2019-11-11T02:45Z	0.636	false
2019-11-11T02:30Z	0.636	false
2019-11-11T02:15Z	0.636	false
2019-11-11T02:00Z	0.636	false
2019-11-11T01:45Z	0.636	false
2019-11-11T01:30Z	0.636	false
2019-11-11T01:15Z	0.636	false
2019-11-11T01:00Z	0.636	false
2019-11-11T00:45Z	0.636	false
2019-11-11T00:30Z	0.636	false
2019-11-11T00:15Z	0.636	false
2019-11-11T00:00Z	0.636	false
2019-11-10T23:45Z	0.636	false
2019-11-10T23:30Z	0.635	false
2019-11-10T23:15Z	0.635	false
2019-11-10T23:00Z	0.634	false
2019-11-10T22:45Z	0.634	false
2019-11-10T22:30Z	0.633	false
2019-11-10T22:15Z	0.633	false
2019-11-10T22:00Z	0.632	false
2019-11-10T21:45Z	0.631	false
2019-11-10T21:30Z	0.63	false
2019-11-10T21:15Z	0.629	false
2019-11-10T21:00Z	0.629	false
2019-11-10T20:45Z	0.628	false
2019-11-10T20:30Z	0.627	false
2019-11-10T20:15Z	0.626	false
2019-11-10T20:00Z	0.625	false
2019-11-10T19:45Z	0.625	false
2019-11-10T19:30Z	0.624	false
2019-11-10T19:15Z	0.624	false
2019-11-10T19:00Z	0.624	false
2019-11-10T18:45Z	0.624	false
2019-11-10T18:30Z	0.624	false
2019-11-10T18:15Z	0.625	false
2019-11-10T18:00Z	0.625	false
2019-11-10T17:45Z	0.625	false
2019-11-10T17:30Z	0.625	false
2019-11-10T17:15Z	0.625	false
2019-11-10T17:00Z	0.625	false
2019-11-10T16:45Z	0.624	false
2019-11-10T16:30Z	0.623	false
2019-11-10T16:15Z	0.622	false
2019-11-10T16:00Z	0.621	false
2019-11-10T15:45Z	0.621	false
2019-11-10T15:30Z	0.621	false
2019-11-10T15:15Z	0.621	false
2019-11-10T15:00Z	0.621	false
2019-11-10T14:45Z	0.622	false
2019-11-10T14:30Z	0.622	false
2019-11-10T14:15Z	0.622	false
2019-11-10T14:00Z	0.623	false
2019-11-10T13:45Z	0.623	false
2019-11-10T13:30Z	0.623	false
2019-11-10T13:15Z	0.623	false
2019-11-10T13:00Z	0.624	false
2019-11-10T12:45Z	0.624	false
2019-11-10T12:30Z	0.624	false
2019-11-10T12:15Z	0.625	false
2019-11-10T12:00Z	0.626	false
2019-11-10T11:45Z	0.626	false
2019-11-10T11:30Z	0.627	false
2019-11-10T11:15Z	0.628	false
2019-11-10T11:00Z	0.628	false
2019-11-10T10:45Z	0.629	false
2019-11-10T10:30Z	0.629	false
2019-11-10T10:15Z	0.629	false
2019-11-10T10:00Z	0.63	false
2019-11-10T09:45Z	0.63	false
2019-11-10T09:30Z	0.631	false
2019-11-10T09:15Z	0.632	false
2019-11-10T09:00Z	0.632	false
2019-11-10T08:45Z	0.633	false
2019-11-10T08:30Z	0.633	false
2019-11-10T08:15Z	0.633	false
2019-11-10T08:00Z	0.633	false
2019-11-10T07:45Z	0.633	false
2019-11-10T07:30Z	0.633	false
2019-11-10T07:15Z	0.633	false
2019-11-10T07:00Z	0.634	false
2019-11-10T06:45Z	0.634	false
2019-11-10T06:30Z	0.634	false
2019-11-10T06:15Z	0.635	false
2019-11-10T06:00Z	0.635	false
2019-11-10T05:45Z	0.636	false
2019-11-10T05:30Z	0.636	false
2019-11-10T05:15Z	0.637	false
2019-11-10T05:00Z	0.637	false
2019-11-10T04:45Z	0.637	false
2019-11-10T04:30Z	0.637	false
2019-11-10T04:15Z	0.638	false
2019-11-10T04:00Z	0.64	false
2019-11-10T03:45Z	0.642	false
2019-11-10T03:30Z	0.645	false
2019-11-10T03:15Z	0.652	false
2019-11-10T03:00Z	0.658	false
2019-11-10T02:45Z	0.649	false
2019-11-10T02:30Z	0.633	false
2019-11-10T02:15Z	0.633	false
2019-11-10T02:00Z	0.633	false
2019-11-10T01:45Z	0.633	false
2019-11-10T01:30Z	0.634	false
2019-11-10T01:15Z	0.634	false
2019-11-10T01:00Z	0.634	false
2019-11-10T00:45Z	0.635	false
2019-11-10T00:30Z	0.636	false
2019-11-10T00:15Z	0.637	false
2019-11-10T00:00Z	0.637	false
2019-11-09T23:45Z	0.64	false
2019-11-09T23:30Z	0.642	false
2019-11-09T23:15Z	0.646	false
2019-11-09T23:00Z	0.652	false
2019-11-09T22:45Z	0.662	false
2019-11-09T22:30Z	0.666	false
2019-11-09T22:15Z	0.659	false
2019-11-09T22:00Z	0.649	false
2019-11-09T21:45Z	0.64	false
2019-11-09T21:30Z	0.634	false
2019-11-09T21:15Z	0.635	false
2019-11-09T21:00Z	0.634	false
2019-11-09T20:45Z	0.633	false
2019-11-09T20:30Z	0.632	false
2019-11-09T20:15Z	0.632	false
2019-11-09T20:00Z	0.632	false
2019-11-09T19:45Z	0.634	false
2019-11-09T19:30Z	0.636	false
2019-11-09T19:15Z	0.64	false
2019-11-09T19:00Z	0.643	false
2019-11-09T18:45Z	0.648	false
2019-11-09T18:30Z	0.653	false
2019-11-09T18:15Z	0.653	false
2019-11-09T18:00Z	0.649	false
2019-11-09T17:45Z	0.646	false
2019-11-09T17:30Z	0.647	false
2019-11-09T17:15Z	0.65	false
2019-11-09T17:00Z	0.656	false
2019-11-09T16:45Z	0.669	false
2019-11-09T16:30Z	0.681	false
2019-11-09T16:15Z	0.679	false
2019-11-09T16:00Z	0.654	false
2019-11-09T15:45Z	0.645	false
2019-11-09T15:30Z	0.644	false
2019-11-09T15:15Z	0.64	false
2019-11-09T15:00Z	0.632	false
2019-11-09T14:45Z	0.619	false
2019-11-09T14:30Z	0.602	false
2019-11-09T14:15Z	0.599	false
2019-11-09T14:00Z	0.598	false
2019-11-09T13:45Z	0.597	false
2019-11-09T13:30Z	0.596	false
2019-11-09T13:15Z	0.594	false
2019-11-09T13:00Z	0.593	false
2019-11-09T12:45Z	0.593	false
2019-11-09T12:30Z	0.593	false
2019-11-09T12:15Z	0.593	false
2019-11-09T12:00Z	0.593	false
2019-11-09T11:45Z	0.593	false
2019-11-09T11:30Z	0.593	false
2019-11-09T11:15Z	0.593	false
2019-11-09T11:00Z	0.593	false
2019-11-09T10:45Z	0.593	false
2019-11-09T10:30Z	0.593	false
2019-11-09T10:15Z	0.593	false
2019-11-09T10:00Z	0.594	false
2019-11-09T09:45Z	0.594	false
2019-11-09T09:30Z	0.594	false
2019-11-09T09:15Z	0.594	false
2019-11-09T09:00Z	0.594	false
2019-11-09T08:45Z	0.594	false
2019-11-09T08:30Z	0.594	false
2019-11-09T08:15Z	0.595	false
2019-11-09T08:00Z	0.595	false
2019-11-09T07:45Z	0.595	false
2019-11-09T07:30Z	0.596	false
2019-11-09T07:15Z	0.596	false
2019-11-09T07:00Z	0.596	false
2019-11-09T06:45Z	0.596	false
2019-11-09T06:30Z	0.597	false
2019-11-09T06:15Z	0.597	false
2019-11-09T06:00Z	0.597	false
2019-11-09T05:45Z	0.597	false
2019-11-09T05:30Z	0.597	false
2019-11-09T05:15Z	0.597	false
2019-11-09T05:00Z	0.598	false
2019-11-09T04:45Z	0.598	false
2019-11-09T04:30Z	0.598	false
2019-11-09T04:15Z	0.599	false
2019-11-09T04:00Z	0.599	false
2019-11-09T03:45Z	0.599	false
2019-11-09T03:30Z	0.6	false
2019-11-09T03:15Z	0.6	false
2019-11-09T03:00Z	0.6	false
2019-11-09T02:45Z	0.6	false
2019-11-09T02:30Z	0.6	false
2019-11-09T02:15Z	0.601	false
2019-11-09T02:00Z	0.601	false
2019-11-09T01:45Z	0.601	false
2019-11-09T01:30Z	0.601	false
2019-11-09T01:15Z	0.602	false
2019-11-09T01:00Z	0.602	false
2019-11-09T00:45Z	0.602	false
2019-11-09T00:30Z	0.603	false
2019-11-09T00:15Z	0.603	false
2019-11-09T00:00Z	0.604	false
2019-11-08T23:45Z	0.604	false
2019-11-08T23:30Z	0.604	false
2019-11-08T23:15Z	0.605	false
2019-11-08T23:00Z	0.605	false
2019-11-08T22:45Z	0.605	false
2019-11-08T22:30Z	0.606	false
2019-11-08T22:15Z	0.607	false
2019-11-08T22:00Z	0.607	false
2019-11-08T21:45Z	0.609	false
2019-11-08T21:30Z	0.609	false
2019-11-08T21:15Z	0.61	false
2019-11-08T21:00Z	0.612	false
2019-11-08T20:45Z	0.613	false
2019-11-08T20:30Z	0.616	false
2019-11-08T20:15Z	0.621	false
2019-11-08T20:00Z	0.611	false
2019-11-08T19:45Z	0.609	false
2019-11-08T19:30Z	0.609	false
2019-11-08T19:15Z	0.609	false
2019-11-08T19:00Z	0.609	false
2019-11-08T18:45Z	0.61	false
2019-11-08T18:30Z	0.61	false
2019-11-08T18:15Z	0.611	false
2019-11-08T18:00Z	0.611	false
2019-11-08T17:45Z	0.612	false
2019-11-08T17:30Z	0.612	false
2019-11-08T17:15Z	0.612	false
2019-11-08T17:00Z	0.613	false
2019-11-08T16:45Z	0.613	false
2019-11-08T16:30Z	0.614	false
2019-11-08T16:15Z	0.615	false
2019-11-08T16:00Z	0.616	false
2019-11-08T15:45Z	0.616	false
2019-11-08T15:30Z	0.617	false
2019-11-08T15:15Z	0.618	false
2019-11-08T15:00Z	0.619	false
2019-11-08T14:45Z	0.62	false
2019-11-08T14:30Z	0.621	false
2019-11-08T14:15Z	0.621	false
2019-11-08T14:00Z	0.622	false
2019-11-08T13:45Z	0.621	false
2019-11-08T13:30Z	0.622	false
2019-11-08T13:15Z	0.622	false
2019-11-08T13:00Z	0.624	false
2019-11-08T12:45Z	0.624	false
2019-11-08T12:30Z	0.625	false
2019-11-08T12:15Z	0.625	false
2019-11-08T12:00Z	0.626	false
2019-11-08T11:45Z	0.627	false
2019-11-08T11:30Z	0.627	false
2019-11-08T11:15Z	0.627	false
2019-11-08T11:00Z	0.628	false
2019-11-08T10:45Z	0.628	false
2019-11-08T10:30Z	0.628	false
2019-11-08T10:15Z	0.628	false
2019-11-08T10:00Z	0.628	false
2019-11-08T09:45Z	0.629	false
2019-11-08T09:30Z	0.629	false
2019-11-08T09:15Z	0.629	false
2019-11-08T09:00Z	0.629	false
2019-11-08T08:45Z	0.629	false
2019-11-08T08:30Z	0.629	false
2019-11-08T08:15Z	0.629	false
2019-11-08T08:00Z	0.629	false
2019-11-08T07:45Z	0.63	false
2019-11-08T07:30Z	0.63	false
2019-11-08T07:15Z	0.63	false
2019-11-08T07:00Z	0.63	false
2019-11-08T06:45Z	0.631	false
2019-11-08T06:30Z	0.631	false
2019-11-08T06:15Z	0.631	false
2019-11-08T06:00Z	0.631	false
2019-11-08T05:45Z	0.631	false
2019-11-08T05:30Z	0.632	false
2019-11-08T05:15Z	0.632	false
2019-11-08T05:00Z	0.632	false
2019-11-08T04:45Z	0.632	false

Forecast data

Key information

• Station name: Hemel Hempstead, Old Fishery Lane
• Station ID: 7186
• River name: River Bulbourne
• Typical range: 0.64m to 1.80m
• Highest level on record: 1.80m on 23 September 1992
• Site datum: 83.07mAOD (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
• View your property's long term risk of flooding

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