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]


Model segment		Calculated input			Wetland tool results
		Influent BOD (mg/L)	Influent TSS (mg/L)		Range of required area for 50 percent BOD removal (acres)	TSS removal for identified wetland area (percent)	Average (maximum) BOD removal (percent)	TSS removal at maximum BOD removal (percent)
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