Investigation of Groundwater Production Impacts on Surface Water Discharge & Spring Flow

Mammoth, California

Mammoth Community Water District

The Mammoth Community Water District (MCWD) is the principal water purveyor and wastewater treatment entity in the Mammoth Basin area. The MCWD has developed a water supply plan to meet the current and future water demands using a combination of local water resources, recycled water, and imported water. This plan includes the potential for long-term increases in groundwater production.

WEI was retained by the MCWD to conduct an investigation to estimate the impacts of historical and future MCWD production on spring discharge in the Valentine Reserve and the Hot Creek headwater springs area. The purpose of this investigation was to estimate the impacts of past and current groundwater production in specific locations within Mammoth. The investigation included the collection and compilation of data and reports and the updating of the time history characterization of district groundwater production impacts on spring and surface water discharges. The analysis demonstrated that the historical groundwater production of the MCWD and the Snowcreek Golf Course has not impacted the springs that discharge to the Valentine Reserve or Hot Creek.

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