On December 2, 1991, a storm took place over the headwaters of Sewee Creek near
Huntsville, Alabama. Sewee Creek streamflow observations were made during and
following the storm and are given in Table 1.
Table 1. Total streamflow observations following the December 2, 1991, storm on Sewee
Creek. (Data obtained from the USGS.)
YEAR MONTH DAY HOUR TOTAL STREAMFLOW (cfs)
1991 12 2 5 70.53
1991 12 2 6 75.19
1991 12 2 7 102.76
1991 12 2 8 192.28
1991 12 2 9 442.62
1991 12 2 10 741.61
1991 12 2 11 929.97
1991 12 2 12 588.92
1991 12 2 13 261.20
Assignment 1: Locate the rainfall data for this particular storm using the provided
spreadsheet of rainfall values for Huntsville, AL (download it from bblearn). You will find
that it was a 5-hour storm. Record these 5 values in a separate spreadsheet. Remember
that the units are in hundredths of inches, so you will need to divide by 100 to get units
in inches. (10 pts)
Assignment 2: Using the total streamflow data from Table 1 and the rainfall values for the
storm, determine the unit hydrograph for this basin. Assume a constant infiltration rate
of 0.015 in/hr (based on observations). Assume that there are no other rainfall
abstractions. Also, you may assume a constant baseflow (groundwater flow) of 70 cfs.
Make a table in your report for the unit hydrograph numbers. (25 pts)
