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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 10. Wetland calculator results (required wetland area and removal rates) for model segments 28 and 54 of the Link‑Keno reach for influent maximum, average, and minimum biochemical oxygen demand and total suspended solids per 100 cubic feet per second of flow diverted to a wetland in the Link-Keno reach of the Klamath River, Oregon.

[Model segments are shown in figure 12. Calculated maximum, average, and minimum values include the 4 years (2006–09), where the treatment period was for May 1–October 31 for each year. Range of required area: All removal rates listed are the average of the results of three models: (1) RCM model; (2) Declining k model (Crites and Tchobanoglous, 1998), (3) Water budget model (Tchobanoglous and others, 2000). Abbreviations: BOD, biochemical oxygen demand; TSS, total suspended solids; na, not applicable; mg/L, milligram per liter; –, no removal]

  Calculated input   Wetland tool results

Range of required
area for 50 percent
BOD removal
TSS removal
for identified
wetland area

BOD removal

TSS removal
at maximum
BOD removal
28 Maximum 20.38 45.46 128–160 77–80 75 (70–79) 83–85
54 15.96 34.45 135–166 75–78 71 (67–75) 80–82
28 Average 7.88 13.41 1193–208 56–59 51 (47–55) 56–59
54 6.47 10.90 na2 na2 44 (40–47) 48–51
28 Minimum 31.36 45.93
54 31.28 44.55

1At minimum water temperature, the maximum BOD removal efficiency was 47 percent.

2No value is indicated because maximum BOD removal rates are less than 50 percent. 

3At low BOD concentrations, BOD was not removed from the water. BOD increased.

4At low TSS concentrations, TSS was not removed from the water. TSS increased.

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

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