Laserfiche WebLink
<br />1 <br /> <br /> <br /> <br /> <br /> <br />ll <br /> <br />1 <br />1 <br /> <br /> <br /> <br />1 <br /> <br />Rather, the source appears to be the high dis- <br />charge - nearly 5000 cfs. <br />To examine the relationship between river flow <br />and water quality, concentrations of the <br />selected parameters were plotted against the <br />corresponding river flow. <br />Parameters which appear to have some correlation <br />with flow rate are TDS, TSS, and total iron. <br />(See Appendix C). Data points in these figures <br />are coded by season in order to determine <br />whether water quality is more strongly influ- <br />enced by the combination of season and flow than <br />by either season or flow alone. TDS concentra- <br />tions appear to decrease with increasing flow. <br />Total suspended solids exhibits an increase with <br />flow during the period between July and <br />September. The high flow events which occur <br />during this period presumably result from in- <br />tense rainstorms, which are more capable of <br />entraining sediment than the snowmelt runoff <br />which occurs during the period between April and <br />June. Total iron appears to increase exponenti- <br />ally with flow rate. <br />Comparison of pre-mining water quality with <br />' operational water quality data shows no change <br /> <br />-24- <br />1 <br />