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Table 1. Hypothetical boundary conditions used to simulate ammonia and DO concentrations during summer and winter low streamflows
[ft3/s, cubic feet per second; mg/L, milligramsper liter; CBOD5, 5-day carbonaceous biochemical oxygen demand; DO, dissolved oxygen; °F, degrees Fahrenheit;
L, low; M, middle; H, high; Mgal/d, million gallons per day]
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Summer 1996 Summer 2006 Winter 1996 Winter 2006
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1 2 3 4 5 6 7 8 9 10 11 12
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Red River headwater source
Streamflow (ft3/s) 16 16 16 16 16 16 55 55 55 55 55 55
Ammonia (mg/L as N) .15 .15 .15 .15 .15 .15 .15 .15 .15 .15 .15 .15
CBOD5 (mg/L) 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5
DO (mg/L) 17.4 17.4 17.4 17.4 17.4 1 7.4 13.4 13.4 13.4 13.4 13.4 13.4
Water temperature (°F) 70.3 70.3 70.3 70.3 70.3 70.3 32.5 32.5 32.5 32.5 32.5 32.5
Reaeration coefficient2 L = M = H = L = M = H = L = 3M 4H L = 3M 4H
1.7 3.0 4.3 1.7 3.0 4.3 0 0
Moorhead treated wastewater point source
Discharge (Mgal/d)5 4.04 4.04 4.04 4.42 4.42 4.42 4.04 4.04 4.04 4.42 4.42 4.42
Ammonia (mg/L as N) 12.5 12.5 12.5 612.5 612.5 612.5 17.9 17.9 17.9 17.9 17.9 17.9
CBOD5 (mg/L) 5.7 5.7 5.7 5.7 5.7 5.7 3.2 3.2 3.2 3.2 3.2 3.2
DO (mg/L) 6.8 6.8 6.8 6.8 6.8 6.8 10.5 10.5 10.5 10.5 10.5 10.5
Fargo treated wastewater point source
Discharge (Mgal/d)5 9.00 9.00 9.00 10.7 10.7 10.7 9.00 9.00 9.00 10.7 10.7 10.7
Ammonia (mg/L as N) .30 .30 .30 .30 .30 .30 .04 .04 .04 .04 .04 .04
CBOD5 (mg/L) 1.5 1.5 1.5 1.5 1.5 1.5 2.7 2.7 2.7 2.7 2.7 2.7
DO (mg/L) 7.0 7.0 7.0 7.0 7.0 7.0 10.2 10.2 10.2 10.2 10.2 10.2
Sheyenne River point source
Streamflow (ft3/s) 13 13 13 13 13 13 19 19 19 19 19 19
Ammonia (mg/L as N) .10 .10 .10 .10 .10 .10 .10 .10 .10 .10 .10 .10
CBOD5 (mg/L) 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0
DO (mg/L) 8.6 8.6 8.6 8.6 8.6 8.6 12.7 12.7 12.7 12.7 12.7 12.7
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180 percent of saturation to more accurately define conditions during low streamflow.
2Per day, base e, 68°F.
3Varies by model subreach as follows: 0.46, 0.11, 0.11, 0.46, 0.11, 0.11, 0.11, 0.11, 0.11, 0.11, 0.11.
4Varies by model subreach as follows: 0.46, 0.46, 0.11, 0.46, 0.46, 0.11, 0.11, 0.11, 0.11, 0.11, 0.11.
5Dry-weather discharge resulting from lower inflow to plants because of less-than-normal precipitation, infiltration, and seepage into the sewage collection system.
6Maximum concentration is 0.3mg/L for condition4a, 4.2 mg/L for condition 5a, and 6.9 mg/L for condition 6a to prevent the instream instantaneous
minimum DO
concentration from being less than 5.0 mg/L at site 5.
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