Ground Water Modeling Using the GMS Software. Specified Areas in Abraka Delta State Nigeria

Research Paper (undergraduate) from the year 2022 in the subject Geography / Earth Science - Physical Geography, Geomorphology, Environmental Studies, grade: 4.03, , course: Physics, language: English, abstract: This work presents the results of groundwater flow modeling in Abraka using the groundwater modeling software (GMS) which supports the MODFLOW as well as the MOD PATH. The model covers the three campuses of Delta State University and environs. A conceptual groundwater modeling approach was employed for the purpose of modeling; the source/sink coverage, recharge coverage, well extraction coverage, river leakage starting heads, Ibound, the top and bottom elevation, hydraulic conductivity and anisotropy; and later calibrated to get the residual of the computed heads verse the observed heads.

The hydraulic sensitivity likewise the effect of recharge and pumping rate was ascertained after calibration. The direction was ascertained as it moves in the direction of the Ethiope river with the velocity of the vector movement of the MODFLOW is given as 0.70016372204 m/day (8.1037465278×10-6 m/sec); likewise the MODPATH of which contaminant flows in the opposite direction of the river and few moving through the wells down to the aquifer with a porosity of 0.8 .volumetric analysis shows the total inflow of water is 138,069.96886253 and outflow -138,076.472868 with a difference of -6.504005432129.

The percent discrepancy value of the model is -0.0047% .This also shows the closeness the model is represents the groundwater condition in the study area The value of the total recharge rate on the aquifer is 12,728.870018005.