The long-term annual precipitation in Lacombe, Alberta is included in the Table below. a) Using the Hazen method to determine the expected annual precipitation for return period of 2, 20, 50, and 100 years. b) what is the probability of occurrence and return period of an annual precipitation greater or equal to 60 cm? c) What is the probability that more than 60 cm of annual precipitation would happen at least once in 2015-2019? Table: Annual precipitation in Lacombe, Alberta Total Precipitation Year (cm) Year 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 Total Precipitation Year (cm) 44.4 50.6 51.5 26.8 50.2 49.0 53.6 34.2 46.3 41.8 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 46.8 34.4 45.4 41.4 52.3 55.9 37.3 38.6 51.5 50.2 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 Total Precipitation (cm) 66.3 43.5 48.6 48.9 49.4 32.9 31.0 30.2 39.4 36.4