Variable Linear Langmuir   2010 2011 2010 2011   R2 NS R2 NS R2 NS R2 NS Runoff 0.90 0.84 0.84 0.79 0.90 0.84 0.84 0.79 Sediment 0.96 0.96 0.96 0.86 0.96 0.96 0.96 0.86 Total P 0.95 0.50 0.74 0.38 0.95 0.68 0.73 0.36 SP 0.93 0.75 0.58 0.36 0.93 0.92 0.58 -15 Tile Flow 0.52 0.45 0.37 0.37 0.52 0.45 0.37 0.37 SP-Tile 0.17 -1.83 NA NA 0.16 -1.28 NA NA

NA = Data not available.

Table 2: APEX R2 and Nash Sutcliffe Efficiency (NS) recalibration (2010) and revalidation (2011) values.