ABSTRACT
The use of artificial groundwater storage and recovery is rapidly becoming an essential component of water resources management systems. It improves their efficiency and cost-effectiveness by providing broad operational flexibility. The demand for new sites, the growing regulatory controls and the need to reduce the unit cost of underground storage could benefit from the use of new techniques that could improve site selection, monitoring and operation of groundwater recharge facilities. The use of surface geophysical methods can supplement and enhance the more traditional hydrogeological assessment methods such as geological mapping, subsurface drilling and pumping tests. For site selection the use of ground and aero-magnetic surveys, reflection and refraction seismic surveys, gravity and magnetotelluric surveys are good methods for hydrogeologic assessment. For monitoring and operational control vertical electric sounding, transient electromagnetic and temporal gravity surveys are applicable, particularly for groundwater mound tracking.
