Abstract:
The Weja River Catchment Study Area Located in the Central Ethiopia Rifty Valley to
West of Lake Ziway and Total Catchment Study Area 967S.km Was Simulated Study
Area Ground Water Flow Modeling by Using MODFLOW USGS-2005(MODFLOW
USGS-2005 Version, 3.1).
The aims of the Modeling Ground Water Flow MODFLOW Quantify Hydraulics and
Aquifer Parameters of Study Area by Existed Data Collections from Desk of Office and
Minster Sector and giving Emphasis Well and Fields Data that Inputs for Raw Data for
MODFLOW Modeling and The approaches to achieve the objective of the research
involve data collection, analysis and synthesis with understanding the flow system of
the Study Area.
Sensitivity analysed for Ground Water Flow System and Aquifer Parameters Were Time
Steps Response for Natural and Man Mad Influence of Study Area Stream Flow,
The Scenarios Analysed the Study Area System of Flow for Ground Water Extraction and
Natural Drain System (spring) Simulated time Steps Response that Due to Over Extraction
of Discharge the Ground Water Flow System Were Time Steps Transited Flow From
Steady State to Unsteady State Ground Water Flow System and Drawn Dawn Was
Increased Time Steps.
MODFLOW USGS-2005 Analysed the Hydraulics Conductivity of Ground Water Flow
System Were Increased Time Steps and Porosity and Other Most Aquifer Parameters
Were Decreased Due to Increased Ground Water Outflow and Over Extraction of Ground
Water Storage Reservoir.
The Study Area Source of Stream Flow Were from Ground Water Storage Reservoir
Outflow to Surface Flow System in the Form of Stream Flow or springs.
Therefore Scenarios Simulated that Due to Over Extraction of Ground Water Level of
Ground Water Decline and Drown Dawn Were Increased Time Steps Due to that Ground
Water Outflow System by Spring Outflow Were Decreased and the Study Area Surface
Stream Flow Were Time Steps Dries Stream Were Formed on Weja River Catchment
