Hydrogeological Characterization of Tegona River Catchment, Bale Zone of Oromia Region
| dc.contributor.advisor | Nedaw Dessie (PhD) | |
| dc.contributor.author | Tola Adugna | |
| dc.date.accessioned | 2020-10-30T08:01:06Z | |
| dc.date.accessioned | 2023-11-09T14:11:13Z | |
| dc.date.available | 2020-10-30T08:01:06Z | |
| dc.date.available | 2023-11-09T14:11:13Z | |
| dc.date.issued | 2014-05-05 | |
| dc.description.abstract | This research was focused on characterizing the hydrogeology of Tegona river catchment, which is located in Bale administrative zone under the Oromia Regional State and situated at about 430 km from Addis in the southeast direction. The hydrogeology and hydrochemistry of the area was characterized by conducting detailed field mapping and sampling with subsequent laboratory analysis. Water balance and chloride mass balance methods were followed to estimate recharge. The main geological successions from youngest to oldest are Quaternary sediments, Quaternary plateau basalts, Tertiary alkali trachyte flows and Tertiary alkali trachyte and basalt flows. Different types of aquifers and aquicludes which range from very high permeability aquifers to impermeable rock units (T>500 m2/d, Q ≥ 7 l/sec to T<5 m2/d, Q = 0-1.5 l/s) were identified in the study area. The very high permeability aquifers of the area are Porous and weathered and/or fractured volcanic rocks mainly basalts and possessing the transmissivity values greater than 500 m2/d and discharge of Q ≥ 7 l/s. The high permeability aquifers of the area are made up of weathered and/or fractured volcanic rocks mainly basalts and possessing the transmissivity values of 50-500 m2/d and discharge of Q =4.5-7 l/s. The moderate permeability aquifers of the area are also characterized by weathered and/or fractured volcanic rocks mainly basalts, with transmissivity values of 5-50 m2/d and discharge of Q =2-4.5 l/s. similarly, the low permeability aquifers of the area are characterized by weathered and/or fractured basaltic rocks, with transmissivity values of T<5 m2/d and discharge of Q <1.5 l/s. Aquicludes and minor aquifers with dry and/or limited ground water resources are considered as impermeable rock unit. The recharge as estimated from water balance method was found to be 327.8 mm/year. Analysis of the area’s water chemistry indicates that Ca2+ and Mg2+ bicarbonate water is the dominant water type of the area. As far as water quality is concerned most of the water samples are found within the range of WHO standard. However, anomalies of Fe, TDS, Ca and, Na concentrations beyond the standard have been encountered in few water samples. Anomalous concentration of some elements which in some cases lead for public outcry has been recommended to be further investigated. | en_US |
| dc.identifier.uri | http://10.90.10.223:4000/handle/123456789/22975 | |
| dc.language.iso | en | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | Hydrogeological Characterization | en_US |
| dc.subject | Tegona River Catchment | en_US |
| dc.subject | Bale Zone | en_US |
| dc.subject | Oromia Region | en_US |
| dc.title | Hydrogeological Characterization of Tegona River Catchment, Bale Zone of Oromia Region | en_US |
| dc.type | Thesis | en_US |