Lake Manitoba flood prevention project flawed, First Nations study suggests A group of Interlake First Nations in Manitoba are raising concerns about the provincial government’s plans to prevent flooding in the region. Social Sharing CBC News · Posted: Feb 11, 2021 11:02 PM CT | Last Updated: February 12 This map shows the north and south basins of Lake St. Martin, connected by a narrow strip of water. The Interlake Reserves Tribal Council says the province's original modelling for the floodwater diversion project was flawed because it treated the lake as one basin.(Submitted by IRTC) A group of Interlake First Nations in Manitoba are raising concerns about the provincial government's plans to prevent flooding in the region.