Table 6. Number of days chronic ammonia toxicity was greater than criteria (and average amount greater 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.
[2007 runs were bracketed by also using TIC calculated with pH during low-bloom conditions (leftmost values when a range is given) for the Link River, Lost River Diversion Channel, and Klamath Straits Drain inputs. Abbreviations: TMDL, total maximum daily load; segment, model segment; N, nitrogen; WWTP, wastewater treatment plant; mg/L, milligram per liter]
| Scenario |
Days greater than chronic ammonia toxicity criteria
(and average greater than the criteria, as ammonia, in mg/L N) |
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) |
111 (0.19) |
101 (0.21) |
98 (0.29) |
79 (0.29) |
68 (0.28) |
| 3(1b) |
Sources at TMDL allocations |
111 (0.19) |
102 (0.20) |
97 (0.28) |
78 (0.28) |
70 (0.27) |
| 3(2a) |
Link River at TMDL target |
122 (0.12) |
117 (0.10) |
119 (0.14) |
109 (0.16) |
101 (0.15) |
| 3(2b) |
Link River and sources at TMDL |
123 (0.12) |
119 (0.10) |
118 (0.13) |
110 (0.14) |
114 (0.11) |
| 2007 |
| 3(1a) |
Base case (current conditions) |
84 (0.21) |
74 (0.32) |
69 (0.35) |
54 (0.33) |
60 (0.34) |
| 3(1b) |
Sources at TMDL allocations |
85 (0.21) |
74 (0.32) |
70 (0.35) |
50–53
(0.33–0.32) |
62–62
(0.33–0.32) |
| 3(2a) |
Link River at TMDL target |
11–110
(0.02–0.07) |
20–76
(0.05–0.12) |
29–83
(0.09–0.16) |
33–86
(0.08–0.20) |
83–91
(0.09–0.12) |
| 3(2b) |
Link River and sources at TMDL |
12–111
(0.02–0.07) |
19–81
(0.05–0.12) |
38–85
(0.08–0.16) |
28–87
(0.08–0.18) |
65–86
(0.07–0.08) |
| 2008 |
| 3(1a) |
Base case (current conditions) |
118 (0.16) |
82 (0.23) |
71 (0.35) |
49 (0.37) |
47 (0.34) |
| 3(1b) |
Sources at TMDL allocations |
118 (0.16) |
87 (0.23) |
73 (0.34) |
49 (0.35) |
46 (0.34) |
| 3(2a) |
Link River at TMDL target |
137 (0.08) |
134 (0.09) |
149 (0.12) |
134 (0.15) |
109 (0.17) |
| 3(2b) |
Link River and sources at TMDL |
136 (0.08) |
144 (0.09) |
158 (0.12) |
151 (0.13) |
133 (0.12) |
| 2009 |
| 3(1a) |
Base case (current conditions) |
118 (0.19) |
110 (0.22) |
94 (0.26) |
43 (0.21) |
27 (0.20) |
| 3(1b) |
Sources at TMDL allocations |
119 (0.19) |
112 (0.22) |
95 (0.26) |
44 (0.20) |
28 (0.18) |
| 3(2a) |
Link River at TMDL target |
129 (0.13) |
124 (0.14) |
119 (0.16) |
98 (0.20) |
95 (0.18) |
| 3(2b) |
Link River and sources at TMDL |
129 (0.13) |
125 (0.15) |
121 (0.16) |
98 (0.18) |
96 (0.15) |
|
First posted July 24, 2013
Part or all of this report is presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Adobe Reader, free of charge. |
U.S. Department of the Interior |
U.S. Geological Survey