THE DOG HAS HAD ITS DAY
Carmichael Road, Hudson, Wisconsin—September 2016 44° 56’ 48”N 92° 43’ 37”W Elevation 820 feet
At this greyhound racing park in Hudson, Wisconsin, vacant since 2001, the Trumpet cairn marks the 485 yards x 254 yards of impervious pavement. This lot, the size of six football fields, is an area where rain cannot soak into the ground: instead, it runs into the local storm water system. The gray sky indicates that some of Hudson’s annual average 33.42 inches of precipitation is on the way. The average in autumn months is 2.81 inches; therefore, almost 2 million gallons of water fell on this parking lot in September. Most of this water flows into the nearby St. Croix River.
Impervious surfaces and flooding- https://water.usgs.gov/edu/impervious.html
Rainfall calculator at http://water.usgs.gov/edu/activity-howmuchrain.html