Number Page 



18 Schematic diagram of the plan view and cross 



section of a typical split channel river 85 



19 Maximum depths and corresponding top widths of 

 undisturbed major, side, and high-water channels 



at four split channel study sites 86 



20 Schematic diagram of the plan view and two 



cross sections of a typical meandering river 87 



21 Maximum depths and corresponding top widths of 

 undisturbed major, side, and high-water channels 

 at 15 study sites with meandering, sinuous, and 



straight configurations 88 



22 Schematic diagram of the plan view and cross 



section of a typical sinuous river 90 



23 Schematic diagram of the plan view and cross 



section of a typical straight river 90 



24 Schematic diagram of an al I uv i a I fan 91 



25 Comparative aerial photography of the Nome 

 River showing change in channel configuration 



resulting from gravel removal activities 96 



26 Aerial photograph of the Ugnuravik River pit 



site showing the insufficient buffer zone 98 



27 Aerial photograph of the Tanana R i ver-Upstream 

 site with substantial buffer zone separating 



the pit from the active side channel 100 



28 Aerial photograph of the Prospect Creek pit 

 showing wide buffer zone separating the pit 



from the active channel 101 



29 Schematic diagram illustrating definitions of 



channel geometric and hyraulic variables 102 



50 Average hydraulic geometry of river channels 



expressed by relations of width, depth, and veloc- 

 ity to discharge at two locations along a river 

 (modified from Leopold, Wolman, and Miller 1964) . . . 104 



31 Schematic diagram showing change in water 

 surface slope in response to a change in 

 water discharge 105 



XIII 



