Based on the property on which the method depends the geophysical techniques can be broadly classified as: 1. Gravity Prospecting 2. Magnetic Prospecting 3. Electrical and Electro-Magnetic Prospecting 4. Seismic Prospecting 5. Well Logging Techniques. 1. Gravity Prospecting Method: The gravity method of geophysical prospecting is based on the fact that the gravitational attraction of sub-surface bodies directly up on [...]
Some clues regarding the water bearing properties of rocks are given as follows: (i) Permeability and non-porosity which is significant in water yielding of rocks. (ii) Beside weathering and texture, the presence of numerous sets of joints, fractures, cleavages and faults breccias form the good water bearing zones in igneous and metamorphic rocks. (iii) Solution opening in limestones and dolomites [...]
The factors to be carefully studied before selecting a site for sinking a well are: (i) Topography: The valley regions are more favourable than the slopes and the top of hill rocks. (ii) Climate: Maximum temperature, the annual rainfall region, intensity of sunlight and humidity are of considerable value. Semi-arid zones are more favourable than arid zones. (iii) Vegetation: (a) [...]