Description: <span style="font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;">Drainage basins or geographic regions referenced when presenting runoff and flood conditions or forecasts. Some large basins have been divided into sub-basins to better illustrate local impacts and conditions. Geographic regions are established by the Hydrologic Forecasting and Water Management Branch. They generally follow drainage basins, but have been modified to avoid splitting urban areas.</span>