Waterproofing and drainage considerations are especially needed in cases where groundwater is likely to build up in the soil and potentially raise the water table. This higher water table causes hydrostatic pressure to be exerted underneath basement floors and against basement walls. Generally speaking, complete waterproofing and drainage considerations are rarely implemented into residential structures (both past and present). Essentially, waterproofing is required anytime a concrete structure is built at or below grade.
The main component of any waterproofing system is a point to discharge the water in the system. When existing drainage has been blocked or there are no additional drainage options, your consultant may suggest a sump pump. A pit is dug out in your basement, which will be the lowest point of your waterproofing system. A high quality plastic liner is installed inside of the pit allowing water to flow into it through gravity drainage.