Alluvial Fan Maps and Graphics
Alluvial fans are broad, gently sloping, fan-shaped landforms made of sediment and debris deposited when a stream emerges from steep hillslopes onto a wide, flat valley. Because these streams drain upland areas, alluvial fans are more prone to floods and debris flows. Here are visualizations featuring alluvial fans along Washington's Lake Chelan and Methow Valley. Made for the Washington Geological Survey
