AGET $220$

Rational Method Homework

$1.$ Using the NRCS Engineering Field Handbook, make a table of raimfall data following the template below. Be sure to use the geographic rainfall factor to adjust for location.

Rainfall Intensity and Rainfall Amounts for Different Retum Periods, for a $24-$hour duration storm for Martin, Weakley County. TN

$2.$ Make a second table for Mobile, Mobile County, AL$.$

$3.$ Calculate the peak runoff rate for a $40$ acre watershed which has a maximum length of flow of $10,000$ fect and an average slope of $\backslash (2\backslash \%\backslash ).$ The watershed is used for a pasture. The soil type for the pasture is a clay. The retum period for the design is $50$ years.

$4.$ Calculate the peak runoff rate for a $125$ acre watershed which has a maximum length of flow of $4,000$ feet and an average slope of $\backslash (2\backslash \%\backslash ).$ The watershed is comprised of $50$ acres of pasture, $50$ acres of woodland and $25$ acres of planted corn. The soil type for the pasture is an open sandy loam and for the woodland and com it is a clay and silt loam. The return period for the design is $10$ years.