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Panel: A-minus-R is a valid regulatory metric but models must be regionally tailored
Summary
At a Nov. 19 State Water Resources Control Board expert-panel meeting, panelists endorsed A-minus-R as a valid metric to estimate potential nitrate discharge while urging flexibility in model choice and more region-specific calibration before imposing a single-model mandate.
An expert panel convened by the State Water Resources Control Board on Nov. 19 recommended using the A-minus-R (A–R) metric to estimate potential nitrate discharges but stressed the need for region-specific modeling and clearer guidance before any statewide mandate. The panel also recommended allowing regional coalitions or third parties to select and calibrate the hydrologic or hydrogeologic models that best fit local conditions.
The panel’s chair of technical contributors, Daniel Geiser, extension specialist at UC Davis, said the group ‘‘agreed that A menos R es una métrica válida a utilizar para, pues, estimar o calcular los descargas potenciales de nitrato’’ and emphasized that the metric is…
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