Whether the groundwater from the dam foundation or dam abutment to the
downstream or the downstream slope, or toward the adjacent river valley leakage, is
adverse to the project, the need to adopt engineering measures to deal with. Although
examples of impermeable or weakly permeable interlayers having a decisive effect
on dam foundation seepage are easy to understand, this is often overlooked by many
people, who simply rely on the WPT value to decide whether to install impermeable
curtains. The use of favourable hydrogeological factors can result in a significant
reduction in the scope of the survey and the workload of the base treatment.