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. 2022 May 1;6(5):e2021GH000524. doi: 10.1029/2021GH000524

Figure 3.

Figure 3

Nitrate estimates for the quaternary aquifer based on samples from 2006 to 2015: (a) Predicted NO3‐N concentration clipped to areas of confidence at 250 m resolution, (b) median probability of exceeding 0.4 mg/L NO3‐N at HUC12 watershed level, which is the most common detection limit in this region during this sampling period. (c) Median probability of exceeding 2 mg/L NO3‐N at HUC12 watershed level. (d) Cumulative frequency of watersheds at both exceedance levels. Note: Low median probabilities can be of significant consequence at local scales.