Design a pumping system to lower the groundwater level, including: selecting the method of pumping to lower the groundwater level; Specify the input geotechnical parameters for calculation; Calculating the structure of the underground water pumping well, the water collection volume of each pumping well to lower the groundwater and selecting the appropriate pump; Calculating the number of pumping wells to lower groundwater for the whole project; Determine the lowering of the groundwater level at each location
Design a pumping system to lower the groundwater level including:
Deep point well | Needle well system |
In the calculation equations for the pump to lower the groundwater level, the most important input parameter is the permeability coefficient. The permeability coefficient can be obtained from laboratory test results such as constant water column, variable water column, from correlation equations or field pumping experiments.
Due to the non-formular effect of sampling, the soil samples do not fully represent the properties of rocks in nature. The results of laboratory experiments such as variable water column or constant water column are therefore not applicable to the analysis and design of the pumping system to lower the groundwater level. The most reliable method for determining the permeability coefficient is the field suction pump test.
In addition, when calculating the pump to lower the groundwater level, we need to consider whether the aquifer is pressurized water or non-pressurized water, the initial groundwater level elevation, aquifer thickness...
The amount of water entering a well will depend on several factors:
Two types of aquifers are commonly encountered in groundwater lowering pumps | Deep point well structure |
Some commercial software is commonly used to calculate and model groundwater levels quite accurately
The Seep module in the Geo-studio software suite
Calculation of pump flow to lower groundwater in case of stable infiltration using Plaxis 2D . software
Modflow software simulates groundwater level lowering for both stable and unstable water levels.
In addition, the calculation of lowering the groundwater level is carried out by different methods. In the construction of deep excavations, the progress of lowering the groundwater level should be carried out in stages, in order to ensure maximum savings while the excavation work still takes place in dry conditions.
Lower the groundwater level to a depth of 6m
Lower the groundwater level to a depth of 12m
Lower the groundwater level to a depth of 15m
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