Ground Water Modelling of a Semi Arid Tank Cascaded Catchment in a Hard Rock Terrain Using Remote Sensing & GIS

ABSTRACT

INTRODUCTION

STUDY AREA AND LOCATION

DATA COLLECTION

GEOLOGY AND SOIL MAP

ESTIMATION OF RECHARGE COMPONENTS

Recharge from Rainfall

Recharge from Tanks

Recharge from Irrigation Water

Recharge from Surface Water Irrigation

Recharge from Ground Water Irrigation

Groundwater Draft

GROUNDWATER MODELLING

Visual MODFLOW

Model Simulation

At first the boundary of the study area map is imported into the model and the map is shown in Figure 5A. The study area has been discretized into an orthogonal grid of 60 rows, 60 columns and 2 vertical layers. The vertical cross-section of the aquifer is shown in Figure 6. This spatial discretization has been found to be adequate in view of the available data and the computational time. For the finite difference solution, a grid of 190m x 120m wasused furthermore, such a grid spacing, given the step chosen for the solution, meets the requirements for numerical stability, even in areas with intense pumping activity.

a. The details about pumping wells and water levels in observation wells during the period of 2007 to 2009 were imported into the model.

b. The hydrologic properties like hydraulic conductivity and storage coefficient based on lithology were imported for each layer is shown in Figure 7 & Ground Head Boundary condition is shown in fig-8.

Model Calibration

Zone Budget

CONCLUSION

ACKNOWLEDGEMENT

REFERENCES

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M.Krishnaveni, Center for Water Resources, Anna University, Chennai