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<br /> <br /> <br />Figure 4 Left: Canyon.bound reaches allernatmg With more open sections In bends <br />characterize most deserl rivers (San Juan River, photograph by U.S Bureau o! <br />Reclamallon). Right: In wider, valley sections. meandenng channels and sandbars are <br />common and npanan woodlands develop on flOOdplains (Gila River, New Mexico), <br /> <br /> <br /> <br />Figure 5 Lett: Boulder Canyon reach of the Colorado River pnor to Hoover Dam, <br />contrasted With; RighI lhe same reach atter lhe dam was In place 10 form Lake <br />Mead. Arizona-Nevada (photographs prOVided by US. Bureau of Reclamation). <br /> <br />- - <br /> <br />--- <br /> <br />.: <br /> <br />~ <br /> <br />> <br /> <br /> <br />, <br /> <br />replaced frum aom'e. and unlined channels s()on are <br />dt"erl~' inCIsed. Arroyo (umn,l: (Fig, "'7) due co <br />water"hl:J abUSl: mch ,as on'f.I:razlng <;Timubtc:s <br />(urthl:r erOSIOn, draEnlllt: Water ubll:s to decrt'ase <br />s[.Ihillry nen more. Groundwater IS pumped from <br />bl:neath the desert tlollr far faSTer than it IS restored. <br />seepJ,l:e lOW channels LuIs .:is "-.lTn tablt:'s drop. .lod <br />streams ce.lsl: [0 thw. R1r.lfl.:in vegetatIOn dls,lppears. <br /> <br />Figure 6 Impenal Dam. Aflzona-Gallfornla. a major diversion <br />on the lower Colorado River. from which canals supply <br />agncultural and domestiC waler for southern California <br />(photograph prOVided by U.S Bureau of ReClamation). <br /> <br />4 <br />