Just 0.16 inches of rain has fallen so far this month at BWI,
behind only September 1884, when only 0.09 inches of rain fell. It’s a dramatic
change from last September, when more than 9 inches of rain fell, and from a
wet trend spanning the past 18 months.
Still, stream flow levels are close to
normal around Central Maryland despite the lack of rain. At times of low
precipitation, more groundwater tends to seep out and keep streams going, and
groundwater levels are healthy, said Jonathan Dillow, a supervisory hydrologist
with the U.S. Geological Survey.
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