The electrical resistivity soundings were carried out for determination of depth of sub strata. The results of resistivity survey were verified by actual sounding tests by static cone penetration tests, logging of auger holes and tests pits. The results also resembles with the geology of the area. The electrical resistivity method is a non-destructive method for subsurface investigation. In this method, a known amount of current is injected into the earth and the resulting potential difference is measured. The method is based on the fact that different subsurface materials offer different resistance to the passage of an electrical current. Thus, by the determination of vertical and lateral variations in this resistance the subsurface deposits can be delineated.

Delhi is occupied by Pre-Cambrian Quartzites overlain by unconsolidated Quaternary sediments. The grey to brownish grey quartzites are often hard and massive, forming a major coaxially refolded antiform, plugging towards southwest. The strike of the major planar structure is towards NE-SW with steep south-easterly dips. The quartzite occupy the central and southern part of the area, while the Quaternary sediments cover the rest of the area.

The depth of bed rock could not be reached due to short length of sounding and the maximum depth investigated was 41.0 m. Even at this depth, the quartzite could not be found which is also supported by the geology of the central part of the Delhi. Water table was found around 4.0 m between 8.0 to 41.0 m, some soft rock was detected. It was later confirmed that the scrap of construction material, i. e., sand stone was dumped in the test area and over a long period, it went to this depth.

This paper describes the details of the field procedure, interpretation of field data, the results of electrical resistivity sounding for delineation of substrata and confirmatory tests by actual sounding tests carried out at the site of proposed building of Sansadiya Gyanpith in the Parliament House Complex.