Figure 7.
The graph depicts drawdown in metres on the y-axis from 0 to 20 and hydraulic conductivity in metres per second on the x-axis from 10 to the power negative 8 to 10 to the power negative 1. Zones are labelled Ejectors, Single stage wellpoints, Two stage wellpoints, Deepwells, and Sump pump. Upper labels indicate the vacuum necessary and the vacuum beneficial. Notes indicate that dewatering is not feasible and may not be necessary at low conductivity, and Excessive seepage flows cut off or wet excavation may be necessary at high conductivity.Range of application of groundwater control pumping methods in granular soils (from Preene et al. (2016), reproduced courtesy of CIRIA: Link to ciriaLink to the cited article; in the original figure the horizontal axis is labelled ‘Permeability’ rather than ‘Hydraulic conductivity’)