Table 1: Potential for surfacing internal erosion in glacial moraine core embankment dams
Kenny & Lau (1985, 1986)
Max filter Unstable core/Unstable core Stable core/
and stable filter
or stable core and
1. Internally unstable if H/F < 1, internally stable if H/F ≥ 1 2. Always high potential if DF15 > 9 DB95 regardless of internal stability. Foster & Fell (2001) continuing erosion boundary. Re-grade core soil on the 4.75mm sieve. 3. Sherard and Dunnigan (1989) no erosion boundary (soil group 2 base soils).