... and sealed into bedrock below the slip surface and later by a drainage adit driven on a rising gradient within the bedrock below the slip surface to connect with the bottom of the wells to convert them to gravity drainage. Artesian pressures beneath the toe berm at the north eastern end have been reduced...

... HYDROELECTRICITY POWER ELECTRICITY COUNTRIES DEVELOPING HYDROLOGY GEOLOGY SITE INVESTIGATION GAUGES HYDROGRAPHS INSTRUMENTATION ADITS MAPS TESTS DESIGN CONTROL DIVERSION SPILLWAYS BEDROCK FILL SLOPES PROTECTION TENDERS TENDERING DOCUMENTATION IMPOUNDING DAMS EARTHWORKS CONCRETE...