Question 4: (25 Points) The annual 7-day minimum average flows for the Buffalo River in Tennesse are given below. Plot the low-flow frequency curve on log Gumble paper. Determine (a) the 10-year 7-day low flows, and (b) the probability of a 160 cfs flow. (Gupta: P11.35) Year Flow (cfs) Year Flow (cfs) 1972 207.8 1989 128.5 1973 209.0 1990 141.2 1974 196.6 1991 156.2 1975 151.4 1992 187.6 1976 117.2 1993 195.3 1977 141.1 1994 184.0 1978 184.0 1995 144.9 1979 206.6 1996 153.7 1980 262.1 1997 157.5 1981 284.5 1998 187.8 1982 252.0 1999 211.2 1983. 151.0 2000 121.0 1984 184.0 2001 138.6 1985 229.3 2002 200.3 1986 214.2 2003 163.8 1987 165.1 2004 182.7 1988 122.2 2005 124.7