AIH Professional Hydrologist — Groundwater Examination

Practice session

An unconfined regional sand aquifer receives diffuse precipitation recharge. Long-term mean annual precipitation is 800 mm/year with a weighted mean chloride concentration of 2.0 mg/L in rainwater. Shallow pristine groundwater below the water table has an average chloride concentration of 25.0 mg/L. Assuming chloride behaves conservatively and there are no anthropogenic, evaporite, or marine sources, what is the estimated mean annual groundwater recharge rate using the chloride mass balance (CMB) method?

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