text: *[http://www.epa.gov/owow/showcase/whiteriver/river_bend/riverbend.html EPA - River Bend Project]
  *[https://web.archive.org/web/20021231051820/http://dnr.metrokc.gov/wlr/flood/maintenance.html Levee and Revetment Routine Maintenance]
  *[http://www.fhwa.dot.gov/engineering/hydraulics/pubs/hec/hec11si.pdf US DOT - Design of Riprap Revetment]