Water Finding Survey – As we have to make Nature to Work, and for matching the Incoming and Outgoing cycle of natural water, there should be enough underground water sources / streams for charging rain water & developing under ground balloons of water via underground streams in the Rock formation. Water in the Borewell is not available from any River / Lake / reservoir, water coming into the borewell aquifer are all flowing sources which is based on the natural Hydrogeological Cycle (Refer Fig. Below) of the region, and as such, we get the per hour yield from the borewell. Water aquifers are usually recharged from local sources of percipitation. Confined aquifers, however, frequently receive recharge many miles from the well.
I. Hydro geological Survey by SCHLUMBERGER V.E.S. method (ERM Method)– The Vertical Electrical Sounding (V.E.S.) is done using the Schlumberger electrode array configuration and the Schlumbereger automatic analysis method of interpretation shall be adopted.Vertical Electrical Sounding survey methodology – The object of V.E.S. is to deduce the variation of resistivity with depth below a given point on the ground surface and to correlate it with the available geological information in order to infer the depths and resistivities of the layers present. In V.E.S. method, the potential electrodes are moved only occasionally, and current electrodes are moved outwards in steps. AB ≥ 5MN In coarse, granular soils, the groundwater surface is generally marked by an abrupt change in water saturation and thus by a change of resistivity. In fine-grained soils, however, there may be no such resistivity change coinciding with a piezometric surface. Generally, since the resistivity of a soil or rock is controlled primarily by the pore water conditions, there are wide ranges in resistivity for any particular soil or rock type, and resistivity values cannot be directly interpreted in terms of soil type or lithology. Commonly, however, zones of distinctive resistivity can be associated with specific soil or rock units on the basis of local field or drill hole information, and resistivity surveys can be used profitably to extend field investigations into areas with very limited or nonexistent data. Also, resistivity surveys may be used as a reconnaissance method, to detect anomalies that can be further investigated by complementary geophysical methods and/or drill holes.Limitations of the Resistivity Method for Water Finding Survey – Thin layer may sometimes not be detectable on the field graph within the errors of field measurements. The thin layer will then be averaged into on overlying or underlying layer in the interpretation. Thin layers of small resistivity contrast with respect to background will be missed. Thin layers of greater resistivity contrast will be detectable, but equivalence limits resolution of boundary depths, etc. The delectability of a layer of given resistivity depends on its relative thickness which is defined as the ratio of Thickness/Depth.Disadvantages of the Resistivity Method for Water Finding Survey – 1. Interpretations are ambiguous; consequently, independent geophysical and geological controls are necessary to discriminate between valid alternative interpretation of the resistivity data (Principles of Suppression & Equivalence)
2. Interpretation is limited to simple structural configurations. 3. Topography and the effects of near surface resistivity variations can MASK the effects of deeper variations.
4. The depth of penetration of the method is limited by the maximum electrical power that can be introduced into the ground and by the practical difficulties of laying out long length of cable.
5. Accuracy of depth determination is substantially lower than with Dowsing or with drilling.
WATER DIVING - DOWSING METHOD
Dowsing is a type of divination employed in attempts to locate ground water, buried metals or ores, gemstones, Oil grave sites and many other objects and materials, as well as so-called currents of earth radiation (Ley lines), without the use of scientific apparatus. Dowsing is also known as divining (especially in reference to interpretation of results), or (when searching specifically for water) water finding, water witching or water dowsing.A pendulum of crystal, metal or other materials suspended on a chain or Dowsing Rods are used in divination and dowsing. The person holding the pendulum aims to hold it as steadily as possible over the center and its movements are held to indicate answers to the questions.Specifically, dowsing could be explained in terms of sensory cues, expectancy effects and probability. Dowsing apparatus has no power of its own but merely amplifies slight movements of the hands caused by a phenomenon known as the ideomotor effect: people's subconscious minds may influence their bodies without their consciously deciding to take action. This would make the dowsing rods a conduit for the diviner's subconscious knowledge or perception; these abilities may be explained by postulating human sensitivity to small magnetic field gradient changes.During the Water Finding Survey our experts study on the basic vital aspects which are as follows – a) Average Rain Fall of the Area. The climate of Andhra Pardesh is referred as Agro-Climatic zones. The North Eastern Coastal zone receives normal or more than 1200mm of annual Rainfall. The State receives about 66% of rainfall from south-west monsoon (June-September) and about 25% from north-east monsoon (October-December). The remaining 9% is received during winter and summer months.b) Geological situation of the plot i.e. vertical height of plot from actual Sea level & horizontal distance, to avoid sea water intrusion into the Dug Well and shallow borewell for maintaining the required water quality & quantity.
The depth of the Borewell is limited, by considering the MSL of the region the average drilling depth & the saturation level with respect to the quality of rocks & can be ascertained; there are number of Creeks dissecting the area which protrudes in the main land and give rise to the mud flangs and swamps.c) Natural Growth of vegetation in & around the plot, for knowing the ‘Natural Gravity Belt’ in the plot.
The earth being stamped by feet emits a loud sound; Various ecological and environmental interactions are mentioned as indicators of groundwater i.e. a tree united with another tree species, and morphological, physiological, and mutational features of plants and plant cover. The occurrence of water below the surface at depths ranging from 3.43 to 171.40 m with the help of various plants and grass varieties could be known.d) Previous records of the surrounding areas borewells. We have been in the Water Management Industry from over four decades now, Our experts makes a study of all available information on existing wells i.e. information pertaining to the drilling and construction of wells would be the main sources of information, depth. thickness. and description of rock formations penetrated: water level variations as successive strata are penetrated; yields from water-bearing formations penetrated and the corresponding draw downs; the form of well construction; and the yield and draw down of the well upon completion. variations in yield and water quality and a history of any problems associated with the well since its completion.After considering the above given four aspects; to maintain the Quality & to achieve the targeted water quantity for the project & for all secondary use, a Test Borewell must be carried out at the appropriate location recommended in your premises by Water Finding Survey to develop the perfect ‘Tailor-Made’ Dug Well-cum-Shallow Borewell system as per your requirement.We have undertaken various Result Oriented 'Turn-Key' projects for various farmers, Industries, Infrastructure companies etc. for making management of Ground Water Resources from 1 lakh Litres to 15 Lakh Litres of Ground Water per day for their various needs.Wish u all the Best!Regards,YASH D SHAH
