• Detailed 2D channel and floodplain modeling • Combined 1D channel flow with 2D floodplain flow areas • Combined 1D channel and overbank flow with 2D flow areas behind levees • Simplified to detailed dam failure i.e., dam breach analyses • Simplified to detailed levee failure i.e., levee breach analyses • 1D flow that suddenly expands laterally into the floodplain overbank area • Flow outside of well-defined single channel • Interconnected or braided streams, meanders, loops • Alluvial fans and estuaries • And many other situations…