The U.S. Army Corps of Engineers is planning to increase the Jackson River’s water flow with a controlled dam release. The release from the Gathright Dam near Covington is part of a study to determine whether controlled releases effectively remove algae and improve water quality in the lower Jackson River. Beginning around 6 a.m. Tuesday, water gradually will be released until the flow peaks at 3,500 cubic feet per second. Normally, releases at this time of year are at a constant flow and height. The corps says in a news release that the maximum surge will last two hours. Then the flow will gradually fall to 195 cubic feet per second. The release will be the fifth conducted this year.