USGS Scientific Investigations Report 2013–5016  - Macrophyte and pH Buffering Updates to the  Klamath River Water-Quality Model Upstream of  Keno Dam, Oregon 

Table 6. Enhanced pH buffering input parameters in the water-quality model for the Link River to Keno Dam reach of the Klamath River, Oregon. 

[Abbreviations: pK_a, acid dissociation constant; OM, organic matter; POM, particulate matter] 

Parameter	Value	Description
PHBUFC	ON	Option to use enhanced buffering routines
NCALKC	ON	Option to use nonconservative alkalinity algorithms
NH4BUFC	ON	Specifies whether ammonia/ammonium is included in pH buffering
PO4BUFC	ON	Specifies whether phosphoric acid is included in pH buffering
OMBUFC	ON	Specifies whether organic matter is included in pH buffering
OMTYPE	MONO	MONO specifies discrete pK_a values
NAG	2	Number of organic acid/base groups to model
POMBUFC	OFF	Specifies whether POM is included in OM buffering
SDEN1	0.1925	Site density for organic group 1, in moles of acid/base sites per mole of carbon in OM
SDEN2	0.6466	Site density for organic group 2, in moles of acid/base sites per mole of carbon in OM
PK1	5.584	The pK_a values (negative log10 of the acid dissociation constant)
PK2	9.594	The pK_a values (negative log10 of the acid dissociation constant)