**4. Conclusion**

Geological and geotechnical assessments have been applied to estimate degree of fracture and characterize both construction and dam foundation materials in order to use for engineering geological mapping purposes which can serve as guide while dam construction. The interpretation presented in this chapter shows that quaternary deposits can be used as both embankment materials and dam foundation particularly where his layer is more thickened. The weak thickness of this soil in the island site contributes to emplacement of dam on Ntem formations. Mapping fracture zones and thus weathered grade in the Ntem Formations lead to improve it by engineering processes as a GIN method that leads to improve it. In addition, it has been demonstrated that, cross plots of velocity, density values can be used to predict and identify zones of fracture, zone of weathering, nature and thickness of layers. Previous work [4], cited in this chapter has shown that Precambrian Ntem

*Construction Materials and Dam Foundation While Memve'ele Dam Building in the Craton's… DOI: http://dx.doi.org/10.5772/intechopen.93758*

Formation based on geological and geotechnical results have been used for engineering design and during Memve'ele dam construction. This approach may have application in other civil applications.
