Floodeye Flood Warning System for Tewkesbury

Floodeye Flood Warning System for Tewkesbury

 
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FLOODeye™© Widget LIVE
 
Floodeye Flood Warning Widget for Tewkesbury
 
NOTE: Floodeye's core system has been upgraded (19:00 21 Feb 2020) to work round the river guage reliability problem. Several river guages are fed into calculations to acheive a more overall reliable result (but not fool proof if several break down).
 
The live Tewkesbury version above displays Real Time information, auto updating about every 15 minutes. Currently the rise or fall shown is the average hourly change over the last four hours.
 
Please note that Tewkesbury Town centre and parking (Spring Gardens area) is flood safe, well above historic flood heights, shops, cafes and pubs open normaly, do not believe the media that indicates otherwise.
 
Unique to Floodeye, water (river) heights are reported in Meters AOD (OS Map Heights), thus anyone can quickly tell when water may reach a location once they know the locations standard measure of land height (AOD).
 
 Floodeye Widget   click to view the basic live widget on your device.
 
Floodeye Home Screen Icon The guide at the top of this page illustrates the basic features. See further down how to use this simple widget to help you predict flood risk.
 
The Home Screen button (icon) on the left is available automatically to compatible browsers and devices.
 
FLOODeye Widgets can be produced for other areas, see contact details at the bottom of this page.
 
 
Current State of the Tewkesbury Rivers
 
Here's a live extract from the RiverFlowView™ © System showing the state of the local rivers. Please note that in this basic map, colour Red indicates some flooding of low lying areas.
 
RiverFlowView for Tewkesbury
 
 
Using the Tewkesbury FLOODeye™© Widget
 
Floodeye Widget Mobile Devicve A key project purpose is to encourage confidence and know how in working round and understanding the occasional floods.
 
The example mobile device on the right shows the basic Floodeye Widget with automatic Pop Up Warnings for Car Parks and Roads. Sponsors are invited to support their local Floodeye.
 
Knowing the land height of the location (as shown on high quality maps) and noting the river height shown on the widget, you can see how much water needs to rise to reach the location. It's not difficult to know when lower level roads are near to flooding.
 
Some example Tewkesbury land heights are:
  • Vine Yards Car Park 10.55 mAOD (meters Above Ordnance Datum)
  • Northway Lane (lower end by Canterbury Leys) 11.05 mAOD
  • Outside White Bear (Bredon Road) 12.0 mAOD
  • Mythe Road A38 causway 12.4 mAOD
  • Bredon Road end near The Old Black Bear Pub 14.0 mAOD
  • Spring Gardens Car Park 16.0 mAOD (too high to flood)
Steady or increasing water level Rate of Change (mm/hr - millimeters per hour) over hours will give you some clue as to how long rising water might take to reach a location.
 
Typically rivers rise slowly, it's only in severe flood risk situations (eg: 75mm rain fall over 2 days on top of saturated ground and existing high river flows) steady rise rates over many hours may reach more than 50 mm/hr (2 inches/hour).
 
For comparison, the River Avon average rise during the 2007 July Floods was 75 mm/hr over 48 hours, the peak hit 140 mm/hr. Keeping an occasional eye on the Rate of Change can provide early warning of flood events.
 
Floodeye Flood Warning Widget for Tewkesbury When to Be Concerned: The example left shows the river level Red (some flooding), the Rate of Change (rise) is high at 73mm per hour (average) over the last four hours.
 
Until the Rate of Change starts to significantly reduce or fall, flood risk to some property is high (in this example). Knowing your local land height will help you know the risk.
 
Please note: it is not unusual to see a short lived high Rate of Change during peak tides, heavy showers and river sluice adjustments (eg: Abbey Mill), these subside quickly.
 
 
Pop Up Flood Warnings
 
Floodeye Vine Yards Car park Pop Up Flood Warning Widget for Tewkesbury
 
Floodeye Vine Yards Car park Pop Up Flood Warning Widget for Tewkesbury
 
Pop up and other automatic warnings are part of the Floodeye system such as the examples above. These can be set to Pop Up on likely flooding, to warn the public, thus avoiding the loss of cars during unexpected flood events.
 
 
Flash Flood Warning
 
Some of the local smaller rivers can rise very quickly given wet ground and high rainfall. For example Tewkesbury's Carrant River and Tirlebrook, water can rise 2 meters (6 feet) in some locations in less than one hour. In one case during the 2007 July floods, it took just 20 minutes to reach 2 meters local depth (Tirlebrook east of M5). There was a similar event in the Carrant Valley at about the same time.
 
There are occasional saturated (very wet) ground conditions that enable rain to run off quickly into local water courses near top of bank flows. Given such conditions, just an additional 15mm of rain spread over a couple of hours has been shown to produce small localised floods (eg: Carrant Valley, flooding of Bredon Road by White Bear Pub).
 
The Floodeye Widget should not be relied upon to see all flood circumstances, the Tewkesbury version simply monitors the river levels and calculates the local water height. Like all electronic systems they can break down. While the Floodeye internet systems are almost fail safe (built in redundancy), the river gauges are less reliable.
 
Floodeye is created and maintained by WWW Support Services after a unique 10 year in depth study of Tewkesbury area flooding. For any further information or to contribute to the project Tel UK: 0776 044 1720
 
 
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