In a storm of 210 minutes duration, the incremental rainfall at various time intervals is given below. Time since start of the storm (minutes) Incremental rainfall in the time interval (cm) 30 60 90 120 150 180 210 1.75 2.25 6.00 4.50 2.50 1.50 0.75 (a) Obtain the ordinates of the hyetograph and represent the hyetograph as a bar chart with time in chronological order in the x-axis. (b) Obtain the ordinates of the mass curve of rainfall for this storm and plot the same. What is the average intensity of storm over the duration of the storm?