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Fig. 8. Estimation of baseflow NO3– concentrations for 1960 to 2050. (a) Lines A, B, and C, projected basin-wide mean annual concentration in ground water recharge 
(total NO3–) scenarios, extended into the past (1920) and future (2050) sufficiently to generate baseflow concentration (Cbf) 
predictions between 1960 and 2050. Scenarios are described in the text. See Fig. 7a for explanation of vertical point diagram. (b) Lines A', B', C' are corresponding Cbf estimates. Shaded area in A' represents Cbf (excess N2). Cross-hair represents year 2000. (c) Cbf 
(±SD) values (solid circles) from the lower left quadrant (1960 to 2000) in Fig. 8b are superimposed on historical baseflow NO3– measurements (small open circles). Solid line: best fit historical data (slope = 0.152 mg L–1 yr–1). Dashed line: best fit Cbf backcasts (slope = 0.159 mg L–1 yr–1).
