Abstract
Investigations in a newly constructed subsea road tunnel in the Iddefjord granite at Hvaler and test-pumping of boreholes on land indicate that a topographic or geophysical anomaly is no guarantee of a substantially transmissive fracture zone. Many prominent fracture zones appear to have depressed transmissivity due to secondary swelling-clay mineral infillings. No current geophysical technique can adequately distinguish these zones from transmissive ones. Given that siting of boreholes on the basis of geology alone can be unreliable, hydrogeologists should concentrate on quantifying the chances of a successful boring, and optimizing those chances by sensible location, favourable borehole orientation and use of artificial enhancement techniques.
Similar content being viewed by others
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Banks, D., Rohr-Torp, E. & Skarphagen, H. Groundwater Resources In Hard Rock; Experiences from The Hvaler Study, Southeastern Norway. HYJO 2, 33–42 (1994). https://doi.org/10.1007/s100400050040
Published:
Issue Date:
DOI: https://doi.org/10.1007/s100400050040