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Scientific Investigations Report 2013–5135


Modeling the Water-Quality Effects of Changes to the Klamath River Upstream of Keno Dam, Oregon


Table 3. Number of days dissolved oxygen was simulated to be less than the 30-day criteria (and the average amount less than the criteria) at selected Oregon Department of Environmental Quality compliance locations for scenario 3 under the base case and Total Maximum Daily Load scenarios, Klamath River, Oregon, for years 2006–09.


[30-day criteria is based on Oregon Department of Environmental Quality regulations (Oregon Department of Environmental Quality, 2011). Abbreviations: segment, model segment; TMDL, total maximum daily load; WWTP, wastewater treatment plant; mg/L, milligram per liter]


Scenario Days less than 30-day dissolved oxygen criteria (and average less than the criteria, in mg/L)
Klamath River at
WWTP inflows
(segments 4, 8)
Klamath River at
Lost River Diversion
Channel inflow
Klamath River at
Miller Island
Klamath River at
Klamath Straits
Drain inflow
Klamath River
at Keno
Segment 8 Segment 19 Segment 38 Segment 69 Segment 95
2006
3(1a) Base case (current conditions) 101 (1.2) 119 (1.8) 124 (2.7) 127 (2.8) 128 (2.7)
3(1b) Sources at TMDL allocations 101 (1.2) 118 (1.7) 124 (2.6) 125 (2.6) 124 (2.4)
3(2a) Link River at TMDL target 0 0 16 (0.1) 85 (0.3) 27 (0.5)
3(2b) Link River and sources at TMDL 0 0 0 69 (0.2) 0
2007
3(1a) Base case (current conditions) 98 (1.8) 111 (2.5) 123 (3.1) 122 (3.1) 108 (2.3)
3(1b) Sources at TMDL allocations 98 (1.8) 110 (2.5) 121 (3.1) 114 (3.2) 102 (2.1)
3(2a) Link River at TMDL target 0 0 9 (0.1) 69 (0.4) 0
3(2b) Link River and sources at TMDL 0 0 0 62 (0.3) 0
2008
3(1a) Base case (current conditions) 97 (2.3) 119 (3.1) 138 (3.3) 143 (3.1) 142 (3.2)
3(1b) Sources at TMDL allocations 97 (2.3) 119 (3.1) 137 (3.3) 141 (3.0) 140 (3.0)
3(2a) Link River at TMDL target 0 4 (0.2) 22 (0.2) 41 (0.1) 82 (0.3)
3(2b) Link River and sources at TMDL 0 3 (0.2) 20 (0.2) 19 (0.1) 0
2009
3(1a) Base case (current conditions) 104 (2.3) 122 (3.3) 136 (3.7) 142 (3.4) 140 (3.5)
3(1b) Sources at TMDL allocations 103 (2.3) 122 (3.3) 136 (3.6) 140 (3.4) 136 (3.4)
3(2a) Link River at TMDL target 0 0 0 86 (0.1) 78 (0.3)
3(2b) Link River and sources at TMDL 0 0 0 57 (0.1) 0

First posted July 24, 2013

For additional information contact:
Director, Oregon Water Science Center
U.S. Geological Survey
2130 SW 5th Avenue
Portland, Oregon 97201
http://or.water.usgs.gov

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