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uk.sci.weather (UK Weather) (uk.sci.weather) For the discussion of daily weather events, chiefly affecting the UK and adjacent parts of Europe, both past and predicted. The discussion is open to all, but contributions on a practical scientific level are encouraged. |
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#1
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During the last few weeks, I have noticed during the recent downpours, and
shortly afterwards, that the local brook has not been flooding as it has in past years. Although the flow rate is up, the depth of water is pretty much the same as during dry weather. This got me thinking. Is it possible that the persistent heavy rain of the last couple of years has softened the underlying ground, and that the water is now soaking back into the ground, replenishing the water table, rather than flowing across and off the surface as it has in other years? If this isn't the case, then where is all the rainfall going, because it doesn't appear to be flowing down the brook in the quantity I would have expected after such heavy rain? As far as I can tell, nothing has changed in the brook, it is still spring fed a couple of miles upstream, the parkland and farm fields are still there to drain into it, and the downstream weirs and grills are still as blocked up as ever. For anyone interested, it is the Billing Brook in Northampton, about a mile from Overstone Park (its source) to the north of the town. Normal dry conditions will be about 6" deep and 3-6 feet wide, and under flood conditions, up to 4 feet deep and about 20 feet wide. This afternoon an hour after a very heavy storm, and during the next downpour that soaked me and the dog right through, it wasn't even a foot deep. So, where is all that water going? jim, Northampton |
#2
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Just checked the local weather station site from Pitsford, 3 miles north of
here. Rainfall so far today = 16.14mm, most of it since 2pm. jim |
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