Powrie, W. and Roberts, T.O.L.
Case history of a dewatering and recharge system in chalk
Géotechnique, 45, (4), . (doi:10.1680/geot.19220.127.116.119).
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The paper describes the performance of a dewatering and groundwater recharge system for a large excavation in chalk. The assessment of the effective bulk permeability of the chalk, and the probable hydraulic boundary conditions are discussed. The measured extraction and recharge flow rates, and the porewater pressures in certain locations, are in reasonable agreement with those calculated using a simple flownet analysis. The influence of groundwater chemistry on the effectiveness of the dewatering system is discussed with reference to an incident towards the end of the pumping period which led to the clogging of the pumps due to calcium carbonate precipitation following a rise in the pH of the groundwater.
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