The triangular-shaped hydrograph given below is representative of a certain 297.52-acre wa...

The triangular-shaped hydrograph given below is representative of a certain 297.52-acre watershed. The hydrograph resulted from a rainfall with an effective duration 1.0 hour. This is not a unit hydrograph, but may be used to develop a unit hydrograph. The watershed is characterized by a CN of 86. A small detention basin (flood retarding reservoir) is located at the watershed outlet. The detention basin is characterized by the following table of water surface elevation versus storage volume in the reservoir and outflow through the outlet structures.

Assume that a rainfall with a depth of 6.0 inches and duration of 3.0 hours falls over the watershed (2.0 in./hr for 3 hours). The rainfall distribution is uniform over time as well as spatially. The base flow is zero. Compute the resulting outflow hydrograph from the detention basin. Use a computational time interval of 1.0 hour.