4.11.3. Mechanical Surging In this method, a close-fitting surge plunger, moving up and down in the well casing, forces water to flow into and out of the well screen. The initial movements of the plunger should be relatively gentle so that the material blocking the screen may go into suspension and then move into the well. To minimise the problem of the fine materials going back to the aquifer from the well, the fine material should be removed from the well as often as possible. The surging method is capable of breaking sand bridges and produces good results. However, it is not very effective in developing filter-packed wells because the water movement is confined only up to the filter pack and the aquifer remains unaffected by the surging action.
