ICS 93.020                          WRD 05

Reaffirmed 2020

1. Scope

This standard lays down guidelines for the requirement and extent of geological explorations to be carried out for gravitydamsand overflow structures in order to evaluate geological and geomechanical characteristics of dam foundations and abutments, for evolving safe and economicdesignsfor constructionof these structures. For achieving this objective, guidelines have been given in this standard. However, special explorationsmayhaveto be carriedout, if extraordinary geologicalconditions, suchaslandslide, subsidence,caverns major fault/shear zones, excessive springflow, gas emanations, etc, are encountered during preliminary investigations. Significance of such adverse geological features in relation to the proposed structure is to be thoroughly understood for est'mation of the magnitude of the problemand for devisingappropriate treatment/remedial measures.

2. REFERENCES

The following standardscontain provisionswhichthrough reference inthis text,constituteprovisionsof thisstandard. At the time of publication, the editions indicated were valid.All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below:

6955 : 1973 Code of practice for subsurface exploration for earth and rockfilldams

6065 : Part 1 : 1985 Recommendations for the preparation of geologicalandgeotechnical mapsfor river valleyprojects: Part I Scales(first revision)