Regressions of Sw-add-dyn and total NO3-N concentration to estimate Sw-amb were based on 14 and 21 data points at Beehive and Middle Fork, respectively (Fig. 4A,B). Results at Beehive (r2 = 0.69, P = 0.0003) and Middle Fork (r2 = 0.97, P < 0.0001) displayed linear relationships between Sw-add-dyn and concentration as predicted by M-M kinetics (Fig. 4). Ambient spiraling metrics derived from these models differed predictably from BTCintegrated values (Table 3). Sw-add-int values were 2.3–2.8 times longer, Vf-tot-int measures were 1.75–2.3 times lower, and Utot-int metrics 2.7–10.9 times greater than ambient parameters with enrichments of 5–25 times background concentrations during slug additions (Table 3).