Abstract: Most of the reservoirs constructed in the Yellow River Delta alluvial plain,in general,have the water depth of 4~5 meters,but the destruction of their dams by seepage is not uncommon.However,Chunhua reservoir has a design storage depth of 8.5 meters,and its impermeable security is particularly prominent.This paper presents two anti-seepage solutions: A,vertical spreading plastics in dam foundation;and B,laying composite geomembrane at upstream slope and vertical plastics combined with underlying impermeable...