zone 4 line a preliminary suspended sediment load estimates hy08 rand eads rivermetrics llc ...
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Zone 4 Line APreliminary Suspended Sediment Load
Estimates HY08
Rand EadsRiverMetrics LLC
503-435-7516
Sources Pathways and Loadings WorkgroupDecember 8, 2008
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Zone 4 Line A HY07• 11/10/06 – 4/30/07• Rainfall 10.38 in.• 21 storms• Max Q 308 cfs• Total Q 33,400 cfs• 84 SSC analyzed• Max SSC 2,744 mg/L• Max turbidity 1590 TU• Est. load 139.6 MT
HY08• 1/31/08 – 6/11/08• Rainfall 2.11 in.• 18 storms• Max Q 241 cfs• Total Q 22,900 cfs• 66 SSC analyzed• Max SSC 2,095 mg/L• Max turbidity 892 TU• Est. load 94.7MT
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Changes in Data Collection Methods from HY07 to HY08
• Bed-mounted boom provided complete data record for season
• Turbidity sensor and sampler intake at depth-proportional sampling position
• Improved debris shedding
• Possible increase in sand to fine ratio
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r2 = 0.89 r2 = 0.90
r2 = 0.89 r2 = 0.89
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0.14”
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0.12”
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0.38”
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0.12”
Storms account for ~95% of the seasonal load
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Zone 4 Sampling HY09
• 9 rising turbidity thresholds (50 - 970)
• 6 falling turbidity thresholds (925 – 100)
• Early season contaminate rising thresholds: 105, 319, 670, 970
• Mid season contaminate rising thresholds: 72, 220, 462, 670
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