Dwex, through its expertise in dewatering technology and system design, innovates & develops optimum engineering solutions with in-depth consideration for environment protection, quality, cost effectiveness & project schedule; developing practical and flexible dewatering systems catering to diverse projects involving complex site and soil conditions.
Well Point Dewatering
Well Point Dewatering, a method of controlling or lowering the water table within a shallow excavation area.
Well Point systems are very effective in different soils conditions.
Single stage Well Point systems are used to a maximum depth of 3.0 meters. For deeper excavations multi-stage Well Point systems can be used.
Deep Well Dewatering
For deep excavations, dewatering can be carried out using Deep Well Systems.
Deep Wells can be used where limited space is available, at some distance from excavation, owing to its ability to form larger radius of influence.
Design of Deep Well dewatering system is more complex as compared to Well Point system and a specialist is required.
French Drain Dewatering
To control surface water or seepage of water between the cavities of hard impermeable strata, French Drain system proves very efficient.
French Drain System involves removing water through cavities of hard strata or draining surface water. The removal of groundwater can take place with the help of gravity, vacuum or submersible pumps.
Pumping tests is very helpful in investigation of ground properties for optimal dewatering system design.
Pumping test involves lowering ground water in controlled flow rates through a Deep Well & recording the flow rate along with drawdown in pre-defined locations of observation wells at regular intervals.
The test results are then used to calculate the permeability of the strata, which is then applied for optimum dewatering system design.
Numerical Modelling Design
Dewatering system design calculations are based on CIRIA, which helps to determine the flow rate into a proposed excavation area using seepage analysis.
Based on this, workable dewatering system is designed (with factor of safety).
Permeability, plot dimensions, depth, boundary conditions & proximity to water body form the major parameters for design calculations.
Computer Modelling Design
Computer modelling simulates steady and non-steady flow in an irregularly shaped flow system in which aquifer layers can be confined, unconfined, or a combination of confined and unconfined.
Hydraulic conductivities or transmissivities for any layer may differ spatially and be anisotropic, and the storage coefficient may be heterogeneous.
Proper interpretation of soil report and making use of dewatering experience can help form the basis of successful system design.