Funding to improve Flat Creek’s water quality has finally been approved in what city officials called a “monumental” agreement with the U.S. Army Corps of Engineers. Six years in the making, Gainesville City Council on Tuesday night authorized spending about $670,000 for the stream restoration project aimed at restoring water flow and repairing the native ecosystem. Flat Creek, which runs 6 miles from downtown Gainesville to Lake Lanier, has suffered from pollution and contamination resulting from litter and sewage spills.