Series 8: These data describe blockage probabilities of logs passing under a flexible barrier. Each probability Pblockage is computed after 30 repetitions of introducing a log in a flume with a given slope (S, values = 2%, 4% or 6%), under a given discharge (Q, range: 1.5 l/s - 6.8 l/s) and with a flexible barrier having a given bottom clearance (z1, values = 10 mm, 15 mm or 20 mm). Each log has a given diameter (exact value: Dlog, class: Dlw) and length (exact value: Llog, class: Llw). The log mean density is assumed to be 770 kg/m3 (range of variation: 745 - 830 kg/m3).