USGS Scientific Investigations Report 2010–5038Suspended-Sediment Budget for the North Santiam River Basin, Oregon, Water Years 2005

Table 4.Regression models for the relation of turbidity and suspended-sediment concentration, North Santiam River basin, Oregon, water year 2008.

[Station reference: Complete station names are shown in table 1 and locations are shown in figure 1. N, number of samples; R², coefficient of determination; MSPE, model standard percent error; SSC, suspended-sediment concentration; T, turbidity]

Station reference	Regression model equation	Bias-correction factor	N	R²	Upper MSPE	Lower MSPE
North Santiam (Precipitation-driven)	log₁₀ SSC = 1.12 log₁₀ T + 0.224	1.12	151	0.95	60.0	37.5
North Santiam (Meltwater-driven)	log₁₀ SSC = 0.898 log₁₀T + 0.0772	1.03	40	0.95	28.8	22.4
Breitenbush	log₁₀ SSC = 1.06 log₁₀ T + 0.215	1.09	119	0.96	50.7	33.6
Blowout	log₁₀ SSC = 1.09 log₁₀ T + 0.140	1.10	169	0.95	54.7	35.3
Niagara	log₁₀ SSC = 0.727 log₁₀ T + 0.163	1.10	78	0.84	54.1	35.1
Rock	log₁₀ SSC = 1.05 log₁₀ T + 0.243	1.06	27	0.94	45.3	31.2
Little North	log₁₀ SSC = 1.02 log₁₀ T + 0.209	1.12	131	0.92	60.9	37.8
Mehama	log₁₀ SSC = 0.931 log₁₀ T + 0.164	1.15	137	0.87	73.2	42.2

Suspended-Sediment Budget for the North Santiam River Basin, Oregon, Water Years 2005–08