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Table 3 Landslide dam stability assessment indices assessed against the recorded behaviour of the Peace River regional landslide dams

From: Longevity of dams from landslides with sub-channel rupture surfaces, Peace River region, Canada

Indices Formula Published Thresholds Reference and Region Applied
   Unstable Uncertain Stable  
Blockage BI = log(VD/AC) < 4 4–5 > 5 Canuti et al. 1998; Casagli and Ermini 1999 (Italy)
Impoundment II = log(VD/VL) < 0   > 0 Casagli and Ermini 1999 (Italy)
   < 1   > 1 Korup 2004 (New Zealand)
Dimensionless Blockage DBI = log(ACHD/VD) > 3.08 2.75–3.08 < 2.75 Ermini and Casagli 2003 (world-wide)
   > 5 3–5 < 3 Korup 2004 (New Zealand)
   > 3.98 2.43–3.98 < 2.43 Tacconi Stefanelli et al. 2016 (Italy)
Backstow IS = log(HD3/VL) < −3 −3 - 0 > 0 Korup 2004 (New Zealand)
Relief IR = log(HD/HR) < −1   > −1 Korup 2004 (New Zealand)
Hydromorphologic HDSI = log(VD/ACS) < 5.74 5.74–7.44 > 7.44 Tacconi Stefanelli et al. 2016 (Italy)
   < 5.26 5.26–8.07 > 8.07 Tacconi Stefanelli et al. 2017 (Peru)