Mass Wasting - Hydrogeology: Objectives, Methods, Applications - page 253

Figure 124 Ardisson landslide (La Trinité, Alpes-Maritimes). Support and surveillance
mechanisms.
1-draining substitution, 2-array of subhorizontal drains, 3-monitoring piezometer, 4-pumping
well.
and enables a very effective drainage, with the collected discharge
varying from 0.1 L·s -1 to 30 to 40 L·s -1 depending on the season. An
embankment of the same type was put in place in the northwestern
valley, in order to stop the toe of the slide and to facilitate hydraulic
evacuation.
• 10 arrays of subhorizontal drains, drilled in periphery in view to drain
the persistent piezometric domes.
• 6 vertical drains equipped with automatic pumps, along the highway
to drawdown the aquifer in the rockfi ll area.