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Determination of volumes of hydrogeological units by means of the code ArcGIS enabled estimation of the approximate amount of groundwater in layers and assessment of the duration of its total exchange (Table 2).

Table 2

Groundwater amounts and exchange durations in the EAB

Hydrogeological unitVolume (km3)Effective porosityGroundwater amount A (km3)Annual water exchange E (km3 year−1)Duration of total water exchange T = A/E (years)
1,163 0.3 349.0 4.073 86 
D3 15 0.03 0.4 0.072 
D3-2 1,633 0.15 244.9 0.963 254 
D2Nr 1,347 0.01 13.5 0.236 57 
D2-1 1,331 0.15 199.7 0.157 1,269 
S-O 4,366 0.03 131.0 1.069 123 
S-Or 10,658 0.01 106.6 0.045 2,368 
O-Cm 4,371 0.05 218.5 0.041 5,289 
Cmr 1,598 0.01 16.0 0.012 1,295 
Vr 740 0.15 111.0 0.015 7,259 
Kt 414 0.15 62.2 0.006 10,323 
Gd 1,751 0.15 262.6 0.013 20,792 
PR 7,157 0.01 71.6 0.002 36,994 
Total 36,543  1,786.9   
Hydrogeological unitVolume (km3)Effective porosityGroundwater amount A (km3)Annual water exchange E (km3 year−1)Duration of total water exchange T = A/E (years)
1,163 0.3 349.0 4.073 86 
D3 15 0.03 0.4 0.072 
D3-2 1,633 0.15 244.9 0.963 254 
D2Nr 1,347 0.01 13.5 0.236 57 
D2-1 1,331 0.15 199.7 0.157 1,269 
S-O 4,366 0.03 131.0 1.069 123 
S-Or 10,658 0.01 106.6 0.045 2,368 
O-Cm 4,371 0.05 218.5 0.041 5,289 
Cmr 1,598 0.01 16.0 0.012 1,295 
Vr 740 0.15 111.0 0.015 7,259 
Kt 414 0.15 62.2 0.006 10,323 
Gd 1,751 0.15 262.6 0.013 20,792 
PR 7,157 0.01 71.6 0.002 36,994 
Total 36,543  1,786.9   

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