Pressure systems are useful for which conditions?

• A. Flat terrain
• B. High water table only
• C. Low water table with gentle slope
• D. High water table, hilly terrain, and infiltration reduction

Answer: (D)

Pressure systems are used to control groundwater and seepage by applying controlled pressure to the soil, sealing cracks and redirecting pore water. This approach is especially effective when the groundwater is near the surface (high water table) and the terrain is uneven or sloped (hilly), where seepage pathways are more complex and infiltration can be a major issue. In such conditions, the ability to reduce infiltration and stabilize the ground with pressurized sealing or grouting provides the most benefit. In flatter areas or where the water table is not high, the need for this pressure-based control is much less, making the combination of high water table, hilly terrain, and infiltration reduction the best fit.