Heavy rain led to flash flooding and river flooding in and close to Delaware County, IA, starting late afternoon on Sunday, October 7th. Portions of Delaware County saw rainfall amounts as high as 5 to 6 inches over a 6-hour period. These rainfall amounts translate to the 1% annual chance rainfall event for a 6-hour duration. This means that there is a 1% chance of this amount of rainfall occurring in any given year.
Flooding affected many locations in and close to Delaware County, including the City of Manchester. There were reports of street and basement flooding. Flood waters washed out bridges and roads in Delaware County.
Below are the radar-estimated rainfall amounts for this event through 4 am Monday, October 8th. These maps are from the Doppler radars located at NOAA/NWS Quad Cities, IA/IL, and at NOAA/NWS La Crosse, WI.
NOAA/NWS Quad Cities, IA/IL, Doppler radar estimated rainfall through 4 am CDT, Monday, October 8th.
NOAA/NWS La Crosse, WI, Doppler radar estimated rainfall through 4 am CDT, Monday, October 8th.
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