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Detecting groundwater storage change using micro-gravity survey in Waterloo Moraine

Micro-gravity surveying based on recent absolute and relative gravimetry technology has been used to detect groundwater storage change through measuring in-situ spatiotemporal gravity change worldwide for decades. The 1 to 5 parts per billion of the Earth's gravity attraction is
detectable, which is equivalent to the attraction of a water mass slab of 2.4 - 12 cm in thickness. With all the standard geophysical effects accurately corrected for, the resulting gravity changes can primarily reflect local and regional total water mass storage changes. To derive groundwater
storage change, surface water and soil moisture storage changes are also required by hydrological methods to separate the groundwater change from the total water mass change at the final step.
In the development of micro-gravity technology for aquifer mapping activity in Canada, two epochs of a pilot gravity survey were conducted in the Waterloo Moraine during the periods of May 10 - 18 and August 23 - September 2 2010, respectively. The same 85 field stations were occupied each time. A
reference station was established in the University of Waterloo using an absolute gravimeter. Two relative gravity meters and two GPS receivers were used for the surveys. Soil moisture data were also collected by Agriculture Canada in coordination with the gravity surveys.
In this paper, we will report the field plan, gravity and GPS survey, data processing and analysis of the two Waterloo gravity campaigns. We will also present preliminary results, conclusions and a future activity plan.

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