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<br />Arkansas River at Las
<br />Animas, CO
<br />0,85
<br />0,86
<br />0,92
<br />0,75
<br />0,88
<br />0,90
<br />.0,77
<br />0,81
<br />0,65
<br />0,90
<br />0.94
<br />0,95
<br />0,85
<br />
<br />Purgatoire River at
<br />Las Animas, CO
<br />0,77
<br />0,79
<br />0.80
<br />0,82
<br />0,82
<br />0.88
<br />0,78
<br />0.84
<br />0,90
<br />0,89
<br />0,77
<br />0,77
<br />0,86
<br />
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<br />data set. The "Post '81" curve does more closely mimic the "Pre-Dam" curve in the 10% to
<br />50% range,
<br />
<br />Historic Sediment Information
<br />
<br />During the first stage of the study, suspended sediment data from John Martin Reservoir
<br />sedimentation reports were analyzed, Relatively long-term records of discharge-suspended
<br />sediment exist for the Arkansas River at Las Animas, and below John Martin Dam, as well as
<br />the Purgatoire River at Las Animas gage stations. The records for both of the Arkansas River
<br />locations covered the period of October 1942 to March 1972, The Purgatoire River period of
<br />record was July 1948 to March 1972.
<br />
<br />Mathematical analyses were performed for each of these locations and the results
<br />plotted, The analyses consisted of entering the values into a spreadsheet program, performing
<br />unit conversions to arrive at water discharge in cubic feet per second (cfs) and suspended
<br />sediment discharge in tons per day (ton/d), elimination of zero discharges, sorting, and finally,
<br />correlation analyses of the logs (base 10) of the watllr versus the suspended sediment
<br />discharges, These analyses were performed for the entire data sets, as well as by months. Table
<br />3-1 provides information on the success of the mathematical representations, The figures in
<br />Appendix A show the scatter data and linear relations,
<br />
<br />Table 3-1. Correlation (R2 values) of discharge ver~us suspended sediment.
<br />
<br />Time Period
<br />January
<br />February
<br />March
<br />April
<br />May
<br />June
<br />July
<br />August
<br />September
<br />October
<br />November
<br />December
<br />Aggregate
<br />
<br />Arkansas River below
<br />John Martin Dam, CO
<br />0.72
<br />0,52
<br />0,78
<br />0.34
<br />0.05
<br />0.02
<br />0,05
<br />O.oI
<br />0,00
<br />0.18
<br />055
<br />0,61
<br />0,69
<br />
<br />14
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