Question

Please check out these directions before the pictures! I hope someone is able to help! Thank you!

11.14 Empirical method. Plot (Q vs. P)data.

Correction to (b) probability of a flow of 1000 cfs

11.15 Use theoretical method (frequency factor).

Plot the flood-freq. curve (Q vs. P)theory.

+ Repeat (a) and (b) in Prob. 11.14.

rhe neak-flow data on an annual basis from Cedar River near Austin, MN, are listed in the following table. Plot the flood-frequency curve on lognormal probability paper. ermine the (a) magnitude of a flood having a return period of 100 years (probability of 1%), and (b) probability of a flow of 100 cfs. Peak- Peak Peak Peak ow ow Ow ow Year 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 Year 1991 1992 2110 2004 3410 1993 8270 2005 2190 1994 1995 1996 1997 1998 124002010 7580 1999 47202011 4640 2000 3250 2012 3190 2001 2002 Year 7750 5440 3580 5260 4000 8800 7070 1972 7520 6990 1974 5570 1965 1966 1967 1968 1969 1970 979 4940 4260 9400 9530 2330 990 9400 3740 3250 2920 3830 1430 3880 2003 8690 5740 2006 4140 2007 4070 3910 1300 2009 3290 4440 2008 1400 1973 1975 1976 1977 2710 2190 2250 4810 2013 10800 3060 2014 2500 he flood sequence of Problem 11.14, perform a frequency analysis by the theoretical method adopting the lognormal distribution.

These are the answers BEFROE using the constraints listed above. I thought I’d include them as a reference.

Answer 1

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