ABSTRACT
This chapter describes some other less commonly used dewatering and groundwater control systems and outlines conditions appropriate to their use.
The systems described in this chapter are
1. Ejector systems, which are appropriate to low-permeability soils such as very silty sands or silts
2. Horizontal wellpointing, which is mainly suitable for dealing with large trenching or pipeline projects of limited depth
3. Horizontal wells 4. Pressure relief wells 5. Collector wells 6. Siphon drains 7. Electro-osmosis, which is applicable to very low-permeability soils or
for increasing the shear strength of very soft soils 8. Artificial recharge systems 9. Applications of dewatering and groundwater control technologies
used for the control or remediation of contaminated groundwater
Some of the techniques described are specialized and, perhaps, rather esoteric in nature. An engineer working in groundworks and excavations might spend a whole career in the field and never have to apply any of these techniques. Nevertheless, it is important to be aware of the specialist methods that may be of help when faced with difficult conditions.
