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<br />RESULTS <br /> <br />Data and analysis of channel change for <br />streamflow-gaging stations are presented by site. <br />The results for each site generally are organized as <br />follows: (1) site information, (2) cross-section <br />analysis, and (3) PZF analysis. Sites on the same <br />stream are presented in downstream order. <br /> <br />09512800 Agua Frla River near Rock <br />Springs, Arizona <br /> <br />The Agua Fria River near Rock Springs (fig. 1) <br />has a drainage area of 1,111 mi2 and usually has a <br />small base flow. Channel alluvium generally is <br />coarse gravel but ranges in size from boulders to <br />silt. Outcrops of bedrock restrict lateral movement <br /> <br />of the stream channel at the cableway and the <br />gaging station. All current-meter measurements of <br />discharge were made at the cableway about 500 ft <br />upstream from the gaging station. The left bank of <br />the cableway cross section is a bedrock cliff, and <br />the right bank is on the inside of a bend in the <br />channel, which is unconsolidated alluvium. The <br />cableway cross section is much more constricted <br />than the cross section at the control for the gaging <br />station. The cableway cross section would have <br />about one-half the cross-sectional area of the <br />gaging-station cross section for the same discharge. <br /> <br />Data for cross sections were reconstructed <br />from cross-section surveys and current-meter <br />measurements (figs. 2-5; table 1). The current- <br />meter measurements were made from the cable- <br />way. The surveyed cross sections are 315 and <br />800 ft downstream from the gaging station, at the <br /> <br /> <br />35,000 <br /> <br />o <br />z <br />o <br />u <br />~ 30,000 <br />a: <br />w <br />a. <br />t- <br />w <br />W <br />LL. <br />U <br />in <br />:::::l <br />U <br />Z <br />ui <br />Cl <br />~ 15,000 <br />J: <br />u <br />~ <br />o <br />>- <br />...J <br /><( <br />o <br />w <br />Cl <br /><( <br />a: <br />w <br />> <br /><( <br /> <br />Cross-sectional area <br /> <br />J <br /> <br />25,000 <br /> <br />20,000 <br /> <br />. <br /> <br />10,000 <br /> <br /> <br />26 <br /> <br />Average dally <br />discharge <br /> <br />5,000 <br /> <br />o <br />1 <br /> <br />11 16 21 <br />JANUARY 1993 <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br /> <br />31 <br /> <br />5 <br /> <br />10 15 20 <br />FEBRUARY 1993 <br /> <br />25 <br /> <br />1,600 <br /> <br />1,500 <br /> <br />600 <br /> <br />t- <br />W <br />W <br />LL. <br />W <br />a: <br /><( <br />:::::l <br />o <br />en <br />z <br /><i <br />w <br />a: <br /><( <br />...J <br /><( <br />Z <br />o <br />i= <br />u <br />w <br />en <br />U, <br />en <br />o <br />a: <br />u <br /> <br />500 <br /> <br />400 <br /> <br />300 <br /> <br />200 <br /> <br />100 <br /> <br />o <br /> <br />Figure 2. Average daily discharge and cross-sectional area, determined from current-meter measurements, <br />at cableway, Agua FriaRiver near Rock Springs, Arjzona, 1993. <br /> <br />8 Determination of Channel Change for Selected Streams, Maricopa County, Arizona <br />