Effect of Moisture Content on Earth Resistivity — Moisture content is one of the controlling factors in earth resistivity. The moisture content is expressed in percent by weight of the dry soil. Dry earth weighs about 1 440 kg per cubic metre and thus 10 percent moisture content is equivalent to 144 kg of water per cubic metre of dry soil. A difference of a few percent moisture will therefore, make a very marked difference in the effectiveness of earth connection if the moisture content falls below 20 percent. The normal moisture content of soils ranges from 10 percent in dry seasons to 35 percent in wet seasons, and an approximate average may be perhaps 16 to 18 percent. It should be recognized, however, that moisture alone is not the predominant factor in the low resistivity of soils; for example, earth electrodes driven directly in the beds of rivers or mountain streams may present very high resistance to earth. If the water is relatively pure, it will be high resistivity and unless the soil contains sufficient natural elements to form a conducting electrolyte, the abundance of water will not provide the soil with adequate conductivity. The value of high moisture content in soils is advantageous in increasing the solubility of existing natural elements in the soil, and in providing for the solubility of ingredients which may be artificially introduced to improve the soil conductivity. We, at Atul Casting and Metal Works manufactures all earthing related products such as G.I Strips, G.I plates, G.I Rods, G.I Pipes, C.I covers, Cable Trays, G.I Wire, Manhole Covers and Route Markers for past 50 + Years in heart of New Delhi. Call us at +91 9873361672 for best deals