Vacuum wellpoints are well suited for a wide range of soil permeability’s (fine to coarse grained soils). They are generally 15 to 25 feet deep and constrained by the limits of the vacuum to pull water out of the ground. They typically have a 3-foot length of slotted well screen at the bottom and are most often spaced from 2 to 10 feet on center, depending on the soils type.