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<br />similar in size, shape and orientation as Squaw Creek backwater. In 1988, <br />BA 249.7 was dry, so BA 249.3 at the mouth of Old Charley Wash was sampled. A <br />new, persistent, relatively deep, backwater at RMI 250.7 (Sand Beach) was <br />added to the sampling program in 1988. <br /> <br />Mapping of backwaters was undertaken to determine their surface area and <br />volume and to relate, if possible, size of these backwaters to limnological <br />characteristics or other environmental attributes. length of the backwater <br />was measured. Two to five transects were then established and measured to <br />determine width; depth was determined at three points along the transect. <br />From this information, surface area and volume of backwaters was later <br />estimated. <br /> <br />Figures 2 to 11 illustrate the general size and shape of the 10 backwaters <br />sampled in 1988, at both high and low river flows. Surface area of shallow <br />backwaters changes more noticeably than deeper backwaters. Surface area and <br />volume for these backwaters are listed in Table 1. <br /> <br />14 <br />