IOWA CITY, Iowa (CBS 2/ FOX 28) — It has been more than seven years since flood waters took out the Delhi dam, causing the city's lake to drain and disappear.

"It's becoming a recreational lake once again, after this year," said Jason Ruffatti, University of Iowa senior in Civil Engineering.

With the lake now fully restored, University of Iowa students are using engineering skills to protect the city of Delhi from unclean water, and make sure years of rebuilding won't go to waste.