Table lists rainfall data recorded at a USGS gage for the storm of September 1, 1999. The basin area is 2050 acres. Using these data, develop a rainfall hyetograph (in. / hr vs. f) in 15-min. intervals and determine the time period with the highest intensity rainfall.

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Time Accumulated Discharge (hr) Rainfall (in.) 16:05 16:20 16:35 16:50 17:05 17:20 17:35 17:50 18:05 18:20 18:35 18:50 19:05 19:20 19:35 19:50 20:05 20:20 20:35 20:50 (cfs) 0.4 1.4 1.9 2.3 2.5 2.6 600 1110 1300 1380 1350 1280 1110 790 460 240 110 59 35 20 12 4