Flood: Moorhead protects stormwater infrastructure
Molly MacGregor (MPCA), who works out of the agency's Detroit Lakes office, said she spoke with Andy Bradshaw, stormwater coordinator the City of Moorhead. She writes:

In response to [your] question about stormwater and pollution, if it is not raining, then [Bradshaw said] the concern is to block anything that river water could back up into – the stormwater system, etc; The city has lift stations for some locations on the stormwater system where they will bring in a portable pump on a tractor (I am pushing my technical limits here!) and pump water out to keep pressure equalized on the city infrastructure. All new developments in Moorhead have stormwater detention ponds.

Here’s a link to how the U.S. Army Corps of Engineers helped Breckenridge address flood mitigation after the 1997 flood – I was told that stormwater ponds that can be pump-out spots during a flood were part of this project.

The International Red River Board assessed how well the jurisdictions (ND, MN and Manitoba) followed up with flood forecasting and mitigation after 1997 – it doesn’t mention stormwater but it does mention the movement of hazardous materials and nutrients due to the 1997 flood.