For unit hydrograph problems, how do I calculate discharge (Q) from excess preci

Question

For unit hydrograph problems, how do I calculate discharge (Q) from excess precipitation data? Can someone explain in detail on how to find Q at 0.5-h increments from the following data set:

Here's the full problem that came along the dataset. You don't have to answer it. I just need help with what I'm asking above.

A triangle can be used to represent a unit hydrograph. Assume an undeveloped 100-acre watershed has a 30-minute unit hydrograph (i.e., it’s developed for a 30-minute pulse of rainfall) with a rising limb of one hour and a falling limb of two hours. Assume that development of the watershed increases travel time and therefore cuts the length of both the rising and falling limbs in half, so that the rising limb is just 0.5 hours long and the falling limb is just 1.0 hours long. Predict pre- and post-development discharge at 0.5 hour increments for the excess precipitation dataset above.

Explanation / Answer

In here divide P/T for each 0.5 hr time interval to get the effective rainfall intensities(ERI for the particular time interval) and then multiply ERI to the catchment area to get the excess precipitation data. To get the total precipitation data do the summation of precipitation for each 0.5 hr increment.

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