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<br />'7) <br /> <br />N <br />oo,J <br />...:J <br />W <br /> <br />TABLE 5 <br /> <br />CHANNEL CHANGES AT AT&SF RAILWAY BRIDGE <br />PURGATOIRE RIVER NEAR LAS ANIMAS, COLORADO <br /> <br />SEDIMENT RANGE 22 <br /> <br />Date of <br />Survey <br /> <br />Change in Cross-Sectional <br />Area Below Girder <br />Since Original Survey <br />(sq.-ft.) <br /> <br />January 1942 (Orig.) <br /> <br />December 1943 <br /> <br />-10 <br /> <br />September 1944 <br /> <br />-35 <br /> <br />December 1945 <br /> <br />-32 <br /> <br />April 1951 <br /> <br />+630 <br /> <br />October 1953 <br /> <br />-10 <br /> <br />August 1957 <br /> <br />-1,053 <br /> <br />March 1962 <br /> <br />-738 <br /> <br />October 1966 <br /> <br />-751 <br /> <br />NOTES: Original opening under bridge girder = 8,000. <br />= Smaller opening denoting aggradation. <br />+ = Larger opening denoting degradation. <br /> <br />Change Since <br />Original Survey <br />(percent) <br /> <br /> -0.12 <br /> -0.43 <br /> -0.41 <br /> +7.87 <br /> -0.12 <br /> -13,16 <br /> -9.22 <br /> -9.46 <br />sq. ft. <br />