1. The attached Excel file Guadalupe.xls (also Guadalupe.csv in comma separated text form) contains the annual maximum flow (cfs) for the Guadalupe River at Victoria for each water year (1 Oct - 30 Sept) from 1935 to 1997. These data are also stored in the LRC server in \class\maidment\gishydro99\frequency. For these data:

- Calculate the mean, standard deviation and coefficient of skewness for the original data and for their logarithms to base 10.
- Prepare a probability plot of the discharge as a lognormal distribution assuming the Blom plotting formula for determining the exceedance probability
- Using this distribution, estimate the 10-year and 100-year return period discharges (cfs) for the Guadalupe River at Victoria.
- The October 1998 flood of the Guadalupe River at Cuero is estimated to be 394,000 cfs. How does that compare to your estimated 100 year flow downstream at Victoria?

- Calculate the mean and standard deviation of the original data
- Prepare a probability plot of the annual maximum daily precipitation (in) as an extreme value type I distribution using the Gringorton plotting formula
- Using this distribution, estimate the 10-year and 100-year return period values for daily precipitation (in)