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Department of Water and Environmental Regulation HYANN V83 Output 19/04/2021 Site 616011 Swan River - Walyunga Variable 151.00 Stream Discharge Volume in Megalitres Year Annual Days Rank Total Missing (Megalitres) ----------------------------------------------- 1970 189500 134 27 1971 137300 11 36 1972 150700 4 32 1973 326100 61 14 1974 1270000 1 1975 311400 16 1976 144000 34 1977 77300 47 1978 304400 18 1979 95180 44 1980 121700 38 1981 711400 9 3 1982 200700 3 26 1983 959300 2 1984 313200 34 15 1985 121500 39 1986 356100 12 1987 210000 25 1988 329500 13 1989 228100 22 1990 424000 10 1991 371100 11 1992 628200 5 1993 226700 23 1994 182300 29 1995 593400 6 1996 682200 4 1997 174000 31 1998 188400 28 1999 563800 7 2000 548500 8 2001 86130 45 2002 80980 46 2003 267100 20 2004 111000 41 2005 292000 19 2006 107400 42 2007 140100 35 2008 181900 30 2009 246100 21 2010 23790 51 2011 135000 37 2012 35050 50 2013 150100 33 2014 118000 40 2015 45270 48 2016 222100 24 2017 452600 9 2018 310600 17 2019 102800 43 2020 39540 49 2021 23420 258 52 Total 14310000 514 Minimum 23420 Maximum 1270000 Mean 275200 Median 195100