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<br />CONTENTS <br /> <br />Page <br /> <br />Abstract ........ ................ ....... ...... ..... ........... ...... ........... ........................................ .... ................ ..................... I <br />Introduction. .... ....... ..... ....... .................. ....... ............... .................. .... .................. ......................................... I <br />Purpose and scope. ....................... ....... ................. .................. ...................... ............................ ......... .... I <br />Acknowledgments.................... .... ..... ................. .................... ...................... .......................... ........ ....... 3 <br />Mechanisms of channel change ..... ...................... .... ............................. .................. ...... ..... ...... ................... 3 <br />Channel scour and fill .. ..................... ............. ........... ....... ................... ............ ....... ...... ..... .... ................ 3 <br />Aggradation and degradation ............ ....... ............... ..... .... ............................... .................. .................... 3 <br />Methods of determination of channel changes ........................................................................................... 4 <br /> <br />Site selection ................................. ... ..................... ..... ........... ... .......... ..... .... ............................ .............. 4 <br />Site survey.. .... ............. .................. ........... ... .......... .................... ......... ............. ........................ ... ... ........ 4 <br />Channel geometry..................... ...................... ................ .... ........... ......... ................. ............... .............. 4 <br />Point -of-zero- flow method.... .......................... ................ ........... ......... ..................... ........... .... ..... ......... 7 <br />Results . ........ ................ ....... ...... ..... ................. ...................... ........... ......... ............... ...... ..... ...... .................. 8 <br />09512800 Agua Fria River near Rock Springs, Arizona ...................................................................... 8 <br />09514100 Gila River at Estrella Parkway, near Goodyear, Arizona..................................................... 12 <br /> <br />Hassayampa River............................... ............... .................... .......................... ............ ............ ...... ....... 14 <br />09515500 Hassayampa River at Box Canyon, near Wickenburg, Arizona .......................................... 16 <br />09516000 Hassayampa River at U.S. Highway 60, at Wickenburg, Arizona....................................... 21 <br />09516500 Hassayampa River near Morristown, Arizona ..................................................................... 21 <br />09517000 Hassayampa River near Arlington, Arizona ........................................................................ 26 <br />09513800 New River at New River, Arizona ....................................................................................... 26 <br />09517280 Tiger Wash near Aguila, Arizona ........................................................................................ 32 <br />09510000 Verde River below Bartlett Dam, Arizona........................................................................... 34 <br />09514200 Waterman Wash near Buckeye, Arizona ............................................................................. 36 <br /> <br />Summary ..................................................................................................................................................... 41 <br />Short-term channel change ...................... ... .............. ....... ........... ......... ................... ............... ....... .... .... 41 <br />Long-term channel change .............. ......... ............. ...................... ...................... ................. ........... ........ 41 <br />Point-of-zero- flow method ........... ....... ....... .......... ........ .............. ...................... ... ........ ...... ................... 41 <br />Selected references.................................. ... .... ............. ..... ............... ........................ ,.. ........ ......... .......... ...... 42 <br />Cross-section data.................................. ........ ............. ..... ............... ........................ ................ .................... 43 <br /> <br />FIGURES <br /> <br />I. Map showing location of study area and channel-change study sites, Maricopa County, <br /> <br />Arizona.............. ............ ....... ................. .... ..... ....... ........... ....... ..... ......... ........ ........................ <br />2-8. 09512800 Agua Fria River near Rock Springs, Arizona. <br />2. Graph showing average daily discharge and cross-sectional area, determined from <br />current-meter measurements, at cableway, 1993........................................................... <br />3. Graph showing cross section from discharge measurements at cableway: <br />A. Scour, January 7 through February 8, 1993............................................................ <br /> <br />B. Fill, February 8-24, 1993........................................................................................ <br />4. Graph showing annual peak discharge and cross-sectional area from surveys <br />during indirect measurements of discharge at cross-section 2, 1970--97......,................ <br />5. Graph showing cross sections from surveys during indirect measurements of <br /> <br />discharge, 1975-96...... ........................ ............... .................... .... ........... ......................... <br /> <br />2 <br /> <br />8 <br /> <br />9 <br />9 <br /> <br />10 <br /> <br />11 <br /> <br />Contents I <br />