..., but it should be pointed out here that the vitally important condition of preventing any surface water percolating through to the sub-base, via french drains or in any other similar way, outweighed the additional cost incurred in theconstruction of this drain. Condition (7) was, in a sense, a challenge...

..., and of consolidating it when roads were widened or footpaths constructed. Those old ditchesprobably performed a vital function, which would bedestroyed by piping them with mortar-jointed pipes unless a sub-soil French drain or something of that nature were putin ; but often open ditches were piped and filled...

...R GLOSSOP © Thomas Telford and ICE 1947 SOILS DRAINAGE ROADS ENGINEERING METHODS CLASSIFICATION WATER TABLE GROUNDWATER FLOW MOVEMENT MOISTURE CONSOLIDATION CLAYS VEGETATION EFFECT SUBSURFACE FOUNDATIONS BEARING CAPACITY CONSOLIDATION FROST FRENCH STABILISATION...