0 27 33 4 9 11 63 5 0 4 5 4 0 0 90__________________________________________________________________________ table 4__________________________________________________________________________water peak wave height at side depth open clos total water mid end of tank wall head over ing ing open velocity chan chan floor angletest ft reef sec sec sec ft sec reef nel nel o o__________________________________________________________________________81 17 0 3 5 3 0 2 0 45 7082 18 0 3 5 3 5 2 5 45 7083 19 0 3 5 4 0 2 5 45 7084 20 0 3 5 4 0 3 0 45 7085 21 0 3 5 4 5 3 5 45 7086 22 0 3 5 5 0 4 0 45 7087 22 5 3 5 5 0 4 5 45 7088 17 0 3 5 3 0 2 0 45 9089 18 0 3 5 3 0 2 5 45 9091 20 0 3 5 4 0 4 0 45 9092 21 0 3 5 4 5 4 0 45 9093 22 0 3 5 5 0 4 5 45 9095 26 0 3 5 5 0 4 0 45 90__________________________________________________________________________ tables 3 and 4 refer to the butterfly valve embodiment of fig6 8 in these tables the tests 31 38 and 81 95 were ones wherein the reservoir had an elevated sloping floor and the entire reservoir was.