beta This is a new service – your feedback will help us to improve it.

Coronavirus (COVID-19): how we're protecting our flood warning service

River level River Colne at London Colney

Latest recorded level 0.81m at 5:30am Tuesday 11 August 2020.

Levels: last 5 days and next 36 hours

You're missing out. A graph should be visible here.
Upgrade your browser to see and use all the features of this service.


You're missing out. A graph should be visible here.

Javascript must be enabled.

Observed data

DateTime Value Error
0.81 false
0.811 false
0.81 false
0.81 false
0.81 false
0.811 false
0.81 false
0.811 false
0.81 false
0.811 false
0.811 false
0.811 false
0.81 false
0.81 false
0.81 false
0.81 false
0.81 false
0.811 false
0.811 false
0.81 false
0.81 false
0.81 false
0.81 false
0.81 false
0.81 false
0.811 false
0.811 false
0.811 false
0.811 false
0.811 false
0.811 false
0.814 false
0.814 false
0.817 false
0.817 false
0.818 false
0.817 false
0.817 false
0.817 false
0.818 false
0.816 false
0.817 false
0.819 false
0.818 false
0.814 false
0.805 false
0.804 false
0.8 false
0.795 false
0.788 false
0.788 false
0.79 false
0.798 false
0.806 false
0.812 false
0.813 false
0.814 false
0.814 false
0.814 false
0.81 false
0.798 false
0.793 false
0.792 false
0.793 false
0.802 false
0.811 false
0.812 false
0.811 false
0.812 false
0.812 false
0.812 false
0.812 false
0.812 false
0.812 false
0.812 false
0.813 false
0.813 false
0.813 false
0.813 false
0.813 false
0.813 false
0.813 false
0.814 false
0.814 false
0.814 false
0.814 false
0.814 false
0.815 false
0.815 false
0.815 false
0.815 false
0.815 false
0.815 false
0.815 false
0.815 false
0.815 false
0.816 false
0.816 false
0.816 false
0.816 false
0.816 false
0.816 false
0.816 false
0.817 false
0.817 false
0.817 false
0.817 false
0.818 false
0.818 false
0.819 false
0.818 false
0.819 false
0.819 false
0.819 false
0.819 false
0.819 false
0.82 false
0.82 false
0.821 false
0.821 false
0.822 false
0.822 false
0.822 false
0.823 false
0.823 false
0.823 false
0.823 false
0.823 false
0.823 false
0.824 false
0.823 false
0.824 false
0.824 false
0.825 false
0.824 false
0.825 false
0.825 false
0.825 false
0.825 false
0.83 false
0.827 false
0.824 false
0.825 false
0.826 false
0.822 false
0.818 false
0.819 false
0.82 false
0.826 false
0.828 false
0.829 false
0.829 false
0.829 false
0.83 false
0.83 false
0.83 false
0.825 false
0.824 false
0.824 false
0.83 false
0.831 false
0.832 false
0.832 false
0.833 false
0.834 false
0.835 false
0.835 false
0.835 false
0.836 false
0.836 false
0.837 false
0.837 false
0.838 false
0.838 false
0.838 false
0.839 false
0.839 false
0.84 false
0.84 false
0.841 false
0.841 false
0.842 false
0.842 false
0.842 false
0.843 false
0.844 false
0.844 false
0.845 false
0.845 false
0.846 false
0.846 false
0.847 false
0.847 false
0.847 false
0.847 false
0.848 false
0.848 false
0.849 false
0.849 false
0.85 false
0.85 false
0.85 false
0.851 false
0.851 false
0.852 false
0.852 false
0.852 false
0.853 false
0.853 false
0.853 false
0.853 false
0.854 false
0.854 false
0.855 false
0.855 false
0.856 false
0.856 false
0.857 false
0.857 false
0.857 false
0.858 false
0.858 false
0.859 false
0.859 false
0.859 false
0.86 false
0.86 false
0.86 false
0.861 false
0.861 false
0.861 false
0.862 false
0.862 false
0.862 false
0.863 false
0.863 false
0.864 false
0.864 false
0.865 false
0.865 false
0.865 false
0.866 false
0.865 false
0.866 false
0.866 false
0.867 false
0.868 false
0.868 false
0.869 false
0.869 false
0.87 false
0.87 false
0.87 false
0.871 false
0.871 false
0.872 false
0.873 false
0.874 false
0.874 false
0.875 false
0.875 false
0.875 false
0.876 false
0.877 false
0.878 false
0.879 false
0.879 false
0.879 false
0.88 false
0.881 false
0.882 false
0.882 false
0.883 false
0.883 false
0.884 false
0.884 false
0.885 false
0.886 false
0.886 false
0.886 false
0.887 false
0.887 false
0.888 false
0.888 false
0.888 false
0.889 false
0.89 false
0.89 false
0.891 false
0.891 false
0.892 false
0.892 false
0.892 false
0.892 false
0.893 false
0.894 false
0.894 false
0.894 false
0.894 false
0.895 false
0.896 false
0.896 false
0.896 false
0.897 false
0.897 false
0.897 false
0.897 false
0.898 false
0.898 false
0.899 false
0.899 false
0.9 false
0.9 false
0.9 false
0.9 false
0.9 false
0.901 false
0.901 false
0.901 false
0.902 false
0.902 false
0.902 false
0.903 false
0.903 false
0.903 false
0.903 false
0.903 false
0.904 false
0.904 false
0.904 false
0.905 false
0.905 false
0.905 false
0.905 false
0.906 false
0.906 false
0.907 false
0.907 false
0.907 false
0.908 false
0.907 false
0.908 false
0.909 false
0.909 false
0.909 false
0.909 false
0.91 false
0.91 false
0.909 false
0.909 false
0.909 false
0.91 false
0.911 false
0.911 false
0.912 false
0.912 false
0.912 false
0.913 false
0.913 false
0.914 false
0.913 false
0.914 false
0.914 false
0.915 false
0.915 false
0.915 false
0.915 false
0.915 false
0.916 false
0.916 false
0.916 false
0.916 false
0.917 false
0.917 false
0.917 false
0.917 false
0.918 false
0.918 false
0.919 false
0.919 false
0.919 false
0.919 false
0.919 false
0.919 false
0.919 false
0.919 false
0.919 false
0.918 false
0.919 false
0.919 false
0.919 false
0.919 false
0.919 false
0.919 false
0.919 false
0.92 false
0.919 false
0.92 false
0.92 false
0.92 false
0.92 false
0.919 false
0.919 false
0.919 false
0.919 false
0.919 false
0.92 false
0.919 false
0.92 false
0.92 false
0.92 false
0.92 false
0.92 false
0.92 false
0.92 false
0.92 false
0.92 false
0.92 false
0.92 false
0.92 false
0.92 false
0.92 false
0.92 false
0.92 false
0.92 false
0.92 false
0.92 false
0.92 false
0.92 false
0.92 false
0.92 false
0.92 false
0.92 false
0.92 false
0.92 false
0.921 false
0.921 false
0.921 false
0.921 false
0.922 false
0.922 false
0.922 false
0.922 false
0.922 false
0.922 false
0.922 false
0.922 false
0.923 false
0.923 false
0.923 false
0.924 false
0.923 false
0.924 false
0.924 false
0.924 false
0.924 false
0.924 false
0.925 false
0.925 false
0.925 false
0.925 false
0.925 false
0.926 false
0.926 false
0.926 false
0.926 false
0.927 false
0.927 false
0.927 false
0.927 false
0.928 false
0.928 false
0.928 false
0.928 false
0.928 false
0.929 false
0.929 false
0.929 false
0.929 false
0.929 false
0.929 false
0.93 false
0.93 false
0.93 false
0.93 false
0.931 false
0.93 false
0.93 false
0.931 false
0.931 false
0.931 false
0.932 false
0.932 false
0.932 false
0.932 false
0.933 false
0.933 false
0.933 false
0.933 false
0.933 false
0.934 false
0.934 false
0.934 false
0.935 false
0.934 false
0.935 false
0.935 false
0.935 false
0.935 false
0.936 false
0.936 false
0.936 false
0.936 false
0.937 false
0.937 false
0.937 false
0.937 false
0.937 false
0.937 false
0.937 false
0.937 false
0.937 false

Forecast data

0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.821
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.822
0.823
0.823
0.823
0.823
0.823
0.823
0.823
0.823
0.823
0.823
0.823
0.823
0.823
0.823
0.823
0.823
0.823
0.823
0.823
0.823
0.823
0.823
0.823
Forecasts contain uncertainty and can change frequently. For the latest information, always check for up to date flood warnings and alerts in your area.


What effect could these levels have on nearby areas?

Typical range at this location

0.94m to 1.85m.

Above 1.85m flooding of low-lying land may occur in these areas

Above 2.30m some property flooding may occur in these areas

Highest forecast level at this location

The highest level forecast in the next 36 hours is 0.82m at 12:00pm Wednesday 12 August 2020.

Highest level recorded at this location

2.72m on 30 October 2000


Share this page