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Department of Water and Environmental Regulation HYANN V87 Output 08/02/2023 Site 616011 Swan River - Walyunga Variable 151.00 Stream Discharge Volume in Megalitres Year Annual Days Rank Total Missing (Megalitres) ----------------------------------------------- 1970 189500 134 29 1971 137300 11 38 1972 150700 4 34 1973 326100 61 16 1974 1270000 1 1975 311400 18 1976 144000 36 1977 77300 49 1978 304400 20 1979 95180 46 1980 121700 40 1981 711400 9 3 1982 200700 3 28 1983 959300 2 1984 313200 34 17 1985 121500 41 1986 356100 14 1987 210000 27 1988 329500 15 1989 228100 24 1990 424000 11 1991 371100 13 1992 628200 5 1993 226700 25 1994 182300 31 1995 593400 7 1996 682200 4 1997 174000 33 1998 188400 30 1999 563800 8 2000 548500 9 2001 86130 47 2002 80980 48 2003 267100 22 2004 111000 43 2005 292000 21 2006 107400 44 2007 140100 37 2008 181900 32 2009 246100 23 2010 23790 53 2011 135000 39 2012 35050 52 2013 150100 35 2014 118000 42 2015 45270 50 2016 222100 26 2017 452600 10 2018 310600 19 2019 102800 45 2020 39540 51 2021 605600 6 2022 423900 12 2023 4.2 328 54 Total 15320000 584 Minimum 4.2 Maximum 1270000 Mean 283600 Median 205300