Channel incision is the deepening of the channel of a stream by erosion. Deepened channels are called arroyos in the American Southwest, gullies in Australia. The Rio Puerco, west of Albuquerque, New Mexico is a notorious example in the American Southwest.
- "Channel and Hillslope Processes Revisited in the Arroyo de los Frijoles Watershed near Santa Fe, New Mexico" by Allen C. Gellis, William W. Emmett, and Luna B. Leopold, U.S. Geological Survey Professional Paper 1704
- Modeling of gully evolution
- Rio Puerco On-Line USGS
- "The Rio Puerco Arroyo Cycle and the History of Landscape Changes" Scott Aby, U.S. Geological Survey, Albuquerque, New Mexico; Allen Gellis, U.S. Geological Survey, Albuquerque, New Mexico; and Milan Pavich, U.S. Geological Survey, Reston, Virginia
- "Erosion in the Rio Puerco: Geography and Processes" by Raymond D. Watts, U.S. Geological Survey, Denver, Colorado; Richard Pelltier, U.S. Geological Survey, Denver, Colorado; and Peter Molnar, Colorado State University, Ft. Collins, Colorado
- "The Arroyo Problem in the Southwestern United States" Brandon J. Vogt, U.S. Geological Survey
- Rio Puerco project