A well point system consists of multiple well points spaced around an excavation site that are connected to a header pipe and pump. The well points are driven or jetted into the ground and draw groundwater into the riser pipes. This water is then pumped out through the header pipe. Spacing of well points typically ranges from 0.75m to 3m, though clay seals and sand filters can improve performance in silts. Well point systems are effective in sandy soils and can lower groundwater levels up to 5-6 meters, making them a relatively cheap and flexible dewatering option. However, they are not effective beyond 4-6 meters of drawdown and may require multiple stages.