Updated 11 Feb 2009
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Floods on Dorset Stour - at Bear Mead
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A comparison of circumstances leading to flooding at Bear Mead.
Flooding occurs when the rate of flow down the River Stour
exceeds about 80 cu metres/sec. This flow is produced by run-off
from a catchment area of 1,300 km2. High run-off can
occur if the water table is high with steady rain, or
low with excessive rain, or combinations
in between. An important factor is the height of the
water table above the river height ,Z, caused by earlier rainfall.
If Z is negative, the ground will absorb rain without runoff.
If positive most of the rain will run straight into the river.
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Unflooded
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Flooded
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Flood 8 10 Feb 2009
Z=+?, 39mms continuous [Note: previous melting snow drove
water table to 220]
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FLOOD-8
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Flood 7 15 Dec 2008
Z=+40, 20mms in 1 day [Note: heavy rain & floods in W Dorset & E Devon]
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FLOOD-7
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Flood 6 17 Mar 2008
Z=+49, 24mms in 2 days
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FLOOD-6
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Flood 5 16 Jan 2008
Z=+30, 95 mms in 12 days
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FLOOD-5
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Flood 4 6 Mar 2007
Z=+30, 58 mms in 5 days
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FLOOD-4
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Flood 3 31 Dec 2006
Z=+30, 54 mms in 3 days
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FLOOD-3
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Flood 2 26 Nov 2006
Z=+10, 120 mms in 10 days |
Flood 1 3 Dec 2005
Z=+10, 30 mms in 2 days
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