5 | CONCLUSION

Based on water table measurement in 16 months, the water table was increasing and directly proportional to rainfall data. It can be concluded that in the arid region, for shallow groundwater aquifers water table fluctuation is highly influenced by rainfall.
The best-fitted-semi-variogram is the exponential model type, which has the lowest RMSE value. Within this given period of water table measurements, the first nine months of data (dry season, November 2018 – July 2019) has a weak spatial dependence (>75%), and during wet season or the second period (wet season) data from August 2019 – February 2020, has strong spatial dependence (<25%).
Based on the cross-validation analysis of the Kriging map using data of weak and strong spatial dependences, the following conclusions can be drawn:
Based on the results of the water table map, the water table is increasing from August 2019 to February 2020. The groundwater is flowing from East to West direction and South-East to North-West direction, which is almost similar to the stream direction on the surface. This result corresponds to the streams elevations where it is assumed that the groundwater is flowing from the higher stream elevation (Southern stream) to the lower stream elevation (Northern stream). On the other hand, a Kriging map using weak spatial dependence data (November 2018 – July 2019) shows that the flow direction is going outside the farm in random directions. It happens because the water tables in the wells do not change in time due to there is no feeding from the rainfall, and therefore, there is no specified direction on the flow.