The question is that, how much can we trust the indicators like SPI and GRI and the other indicators that analyze the changes in groundwater levels in relation to precipitation? Due to the fact that in many regions, including arid and semi-arid regions, the water table is very low and most likely due to high evaporation, rain does not play a role in groundwater recharge. Based on my Experiences in the assessment of groundwater in Kashan, located in the center of Iran in an arid and semi-arid region, precipitation does not feed the groundwater (based on the analysis of tritium and carbon-14 isotopes). It seems that in the subject of the effect of meteorological drought on the hydrogeological drought, isotope investigation could be so important. I think the meteorological and hydrogeological indicators such as SPI and GRI, are more reliable for moderate regions with high precipitation and sallow aquifers. I look forward to receiving your valuable opinions about this matter.
In dry areas, the groundwater level is usually deep and does not show a rapid response due to the sudden rain due to the depth. Even evaporation is not clear to the deep level except in the circumstances that the underground reservoir is subject to storage conditions. In this case, the fluctuation may result from feeding Far from mountain areas or riverbeds
Article Reconnaissance Drought Index Based Evaluation of Meteorologi...
Thanks dear Bayan and Muhammad. I see so many paper that report these indices in arid and semi-arid regions. But, most of these aquifers might be recharged more than 1000 years ago, under different climatic conditions. So, it is important to know which index is capable for arid and semi-arid regions. and before that we need isotopic investigation.
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