Since it's past the one year anniversary - Here is a look in pictures posted on a local (Houston) news page. I'm sure other areas impacted by Harvey have their own pictures and stories to share.
https://www.click2houston.com/harvey
"A total of 1 trillion gallons of water fell across Harris County over the 4 day period which would fill NRG Stadium 1,472 times and cover Harris County’s 1,777 sq. miles with an average of 33.7 inches of water. This volume of water would also run Niagara Falls for 15 days."
Records Broken
The report includes a number of USGS gauge readings of stages that were taken during Hurricane Harvey, most of them record-breaking. The oldest record to fall was this one on Brays Bayou at Belle Park Drive.