This was National Public Works Week. Pella Public Works Director Denny Buyert says the department is responsible for a vast amount of public infrastructure including about 61 miles of streets, 77 miles of water lines and 76 miles of sanitary sewer lines. He says 27 employees are on staff. The Knoxville Public Works Department visited elementary schools this week to educate students on the vital sewer, street and water quality maintenance the department provides.