The objective of this research is identification of soda spring sources andrncharacterization of hydroelectrically evolution on the basis of waterrnsample data hemispherical analysis. This is attempted throughrnunderstanding of geological settings, archaeological effects, andrntectonic activity including other factors.rnGeologically it is composed of sedimentary rock and volcanic products,rnthe later is recognized to be younger resulted from tertiary andrnquaternary volcanic episodes. Its products spread over the large part asrnout crop overlying the earlier. Mesozoic sedimentary sequences arernlimited to the western edge, which is noticed as Adigrate sandstone.rnSome hydrometrological parameters are briefly addressed precipitationrndepth from isohytal computation is 1143.1-mm/year while arithmetic isrn1137.67mm/year, temperature is found to be 18.1oC and annual meanrnactual evapotranspiration using SEBAL modeling is 320.4mm.rnRoughly it can be said scoracious and fractured basalts are the majorrneconomical water bearing formations while ignimbrite is the confiningrnlayer; moreover geological structures play key role in controlling waterrnresources of the area.rnNoticing the eleven variables (pH, Ca2+ Mg2+ K+, Na+, HCO3-, CO3-, Cl-,rnSO42-,TDS) at least two Ionic evolution can be notable (Seifu Kebede etrnal, 2005): fresh low TDS Ca-Mg-HCO3- type envisages most western partsrnand northern highland (ambo fault belt). Second type high TDS Na-rnHCO3_ is limited to thermal spring emerging zone controlled by regionalrndeep seating geological structures. Perceptible high CO2 presence fromrnsediment carbonation and magma degassing is responsible for thernevolution, when transferring takes place from shallow circulating to deeprngroundwater system. In the deep groundwater system both the igneousrnand Mesozoic sediments most likely contribute for the high ionic species.rnKey words: Earth processes; Basalt; Igniter; Eleven variables; Ionicrnevolution; Degassing.