In most of the civil engineering applications, a depth of 60m with a typical depth value of 20m is used.įor a limited distance say 1 to 2m, the well might penetrate an impermeable layer lying below the pumped aquifer. This helps to produce yield and interactive drawdown. To have sufficient wetted area of intake in the aquifer, adequate well depth have to be provided. The use of deep well with vacuum systems to dewater a shaft over a stratified ground material. This type requires adequate vacuum capacity to undergo the dewatering operation efficiently.įig.2. The installation of deep well system incorporating vacuum is shown in figure-2. This phenomenon avoids seepage from the perched water into the excavation. In areas, there are rock layer below the ground table this method work best.Īn increase in hydraulic gradient to the well because of the use of vacuum creates a vacuum within the surrounding. This is applied for related works of tunnels, caissons sunk, shafts and the areas with fine grained sand or stratified soils that are pervious. In order to dewater small deep excavations, the deep well systems can be used in conjunction with the deep wells. The installation of filter also helps to improve the yield. This arrangement helps to prevent the infiltration of the foundation materials into the well. When such a system is installed, a filter is placed around the screen. These systems will make use of a screen that have a diameter of 6 to 4 inches with lengths ranging up to 300 feet. The deep wells arrangement for the purpose of dewatering is similar to that for commercial water wells. Working and Arrangement of Deep Well System Suitability of Deep Well Dewatering System.Operation of Deep Well System for Dewatering of Excavations.Working and Arrangement of Deep Well System.Here the excavation can be pre*drained for the complete depth. This will let the construction area to free from burden by the equipment that is used for dewatering. The main significance of deep wells as a means of dewatering is that they can be installed all around the periphery of the excavation. These can be dewatered by pumping from deep wells by using a turbine or a submersible pump. The excavations and the shaft made can be 300 feet in depth. This is mainly employed for the ground preparation for the construction of tunnels, dams, powerhouses, shafts, and locks. This hence demands higher rate of pumping for dewatering. The method of deep well dewatering systems is more suitable in areas where deep excavations are performed. This method can also be employed to remove the artesian pressure of the ground area under consideration. □ Reading time: 1 minuteDeep well systems are dewatering methods used to remove the water from pervious sand or rocks formations beneath the excavations.
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