The Exploitation of Aquifers - Hydrogeology: Objectives, Methods, Applications - page 191

Figure 102 Catchment systems for coastal waters using drainage galleries.
Finally, if the hypothesis of saline contamination through deep
paleodrains is considered, according to mechanisms visible in the Bay of
Bali or in Argostoli (see chap. A9), an attempt could be made to locate and
block the drains.