In this study, we verified the spring water flow estimation formula in previous years while keeping the underground structure as a black box. As results,
1) The validity of previous years’ estimation methods was verified for both annual water balance and short-term water balance for calculating daily flow.
2) In planning the return of the base site, it is necessary to consider the land use plan from the stage when the base is not accessible, but we have established a method that allows us to estimate the impact of development on the water cycle in this stage.
