The study corridor is found in Sidama zone, SNNPRS. It is situated in the Central sectorrnof the MER system. The study area with 1582 km2, comprises parts of the two adjacentrncatchments namely Lake Awassa and upper Gidabo River, which is delineated arbitrarilyrnso as to determine whether there is groundwater circulation between them or not andrnquantifying the amounts. Recently, the Awassa lake level is continuously rising sincernsome times and evacuate so many residences from the lake shore and damage properties.rnThis rising of the lake level causes a major threat for the Awassa town and surroundingrnrural communities.rnIntegrated methodologies are used to find out the groundwater flow system andrnhydrochemistry of the corridor along with employing the appropriate software likernGlobal Mapper, Surfer, ArcGIS, ArcView, and Aquachem that facilitate for analyses andrninterpretations of the data in order to get the output. The secondary date are collectedrnfrom the concerning offices and some primary date are obtained during field work.rnAccordingly, groundwater flow system is considered as shallow and deep aquifer casesrnand the outputs indicate that there is the same flow trend within the two flow systems.rnGroundwater flows take place from south east towards north west and to the west; andrnthere are also flows from central west (Yirba area) to the north (Lake Awassa) in thernstudy corridor. The total groundwater flowing amount that outflow from upper Gidabornriver catchmetnt is quantified to be 5.81MCM.rnOn the other hand, hydrochemical data analysis part also reveals: evolution of majorrnions, water types, potablity of water for human consumption, spatial distribution of somernmajor ions including fluoride and direction of groundwater flow. For example, the waterrnsample from hot spring and Lake Awassa is Na-HCO3 type, which indicates the presencernof evolution. Whereas cold springs mostly from highlands and the eastern riftrnescarpment has the water type of Na-Ca-HCO3, shows minor evolution. The increasingrntrends of the phisico-chemical analyses indicate that there is groundwater outflowrntowards the lake region