Hydrograph analysis of an extreme flood event on a 6.97 mi² watershed indicated that the rainfall excess pattern was:

Time (hours)	0-2	2-4	4-6
Pe (in)	0.43	1.77	2.81

and the direct runoff hydrgraph was:

Use this information to determine the 2-hour unit hydrograph for the watershed by optimization (with constaints) using the Excel Solver function.  First set up the set of deconvolution equations in Excel, and then:

1. Solve for the unit hydrograph values by minimizing the sum of the squared errors (predicted minus observed squared).
2. Plot the predicted and observed direct runoff hydrograph (in cfs) for the optimized unit hydrograph [one plot].
3. Plot the 2-hour unit hydrograph (in cfs).