In addition to programs designed to diminish the amount of phosphorus runoff into Lake Okeechobee and the amount of exotic plants that are in the lake, LOPP includes a Lake Okeechobee Construction Program, which comprises the Lake Okeechobee Water Retention/Phosphorus Removal Project, a Critical Restoration Project authorized in the federal Water Resources Development Act of 1996. This Critical Project includes the restoration of isolated wetlands and construction of large retention areas, or Stormwater Treatment Areas, which improve the water quality of runoff draining from areas up to several hundred square miles in size. The Lake Okeechobee Construction Program also includes a Comprehensive Everglades Restoration Plan Project – the Lake Okeechobee Watershed Project - which is designed to improve water quality to Lake Okeechobee and downstream receiving waters.