Jason Vogelgesang, right, and Thomas Doyle drive along a levee by the Raccoon River in Des Moines to survey the geology of the levee. (Photo by Cami Koons/Iowa Capital Dispatch)
Drive across the top of the levee; come back along the levee’s “toe” slope; pause when a flood wall or obstruction crosses the levee; move to the next section.
This has been the methodology for the Iowa Geological Survey team members the past several fall seasons as they survey the geological integrity of Iowa’s 900 miles of levees…