4.3 Aquifer Hydraulics

The delta aquifer consists of deeply incised paleochannels filled with sediments, underneath the present river channel, with a total storage capacity at 150 Mm³ (Figure 17). The Omdel wellfield of 33 boreholes was developed here in the 1970s to augment coastal supplies. The production wells tap the 70 to 110 m thick sandy-gravel alluvium (Christelis and Struckmeier, 2001; Geyh and Ploethner, 1995).

Figure 17 – OMDEL aquifer with the main channel and side channels (Geyh and Ploethner, 1995).