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Methodology  Aquifer Maps
The hydrogeological, geophysical and geochemical components of the pilot study are integrated to provide information on the aquifers in each pilot area. This includes in particular the geometry of aquifers and hydrogeological information on these aquifers. Also, aquifer characterization helps estimate the water budget and the aquifer resource availability.
A major output is 1:50,000 scale multiple-layer digital maps of the areas; in selected areas the scale of the maps is 1:10,000 scale. These maps are given both under 2-D and 3-D.
Technical maps are produced to support modeling and aquifer-based groundwater management. Besides these, descriptive maps are also produced at the block level or watershed level.
These maps integrate the different thematic layers, including:
Background maps, i.e. on lineaments, soil types, surficial geology, hydrogeology, fence-diagrams / cross-sections, etc
Aquifer maps:
Aquifer geometry maps,
Contour maps for water table and hydrostatic heads of different aquifers,
Groundwater flow maps,
Maps on aquifer depths, saturated/total thickness and estimated yield,
Maps on spatial variation of hydraulic parameters,
Maps on quality of groundwater in different aquifers,
Hydrogeological cross sections and 3-dimensional aquifer disposition diagrams,
Depth of drilling, discharge, well spacing and the limits,
Level of exploitation of aquifers and annual recharge, vulnerable aquifers, their protection and sites for their monitoring,
Dynamic and static resource and aquifer wise water budget, and
Areas for artificial recharge.
Example of thematic layers for an aquifer map.
Source: CGWB
Example of fence diagram showing aquifer disposition.
Source: CGWB