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Thanks Please can you elaborate on the pumping sump. Could this be installed as a permanent fixture? within the sub soil?

I am more concerned with water build up in the subsoil as thios will increase the pressures on the permanent structure and the methods to control this.

Please can someone advise me on the practical methods of controlling ground water pressure in a permanent earth retaining structure. Everywhere i look there is info on temporary structures but not much for permanent. Thanks in advance.