Discussion

Krause and Flood (1997) note that the total precipitation during the storm was 91.0 mm (3.6 inches) of which 72 mm (2.84 in) fell during a 50-minute period from 2:50 to 3:40 P.M. Rainfall was masured with a recording raingauge located in satisfactory exposure. Some 13 points pertaining to functioning of the gauge were considered in evaluating this record by H.H. Engelbrecht; then State Climatologist for Maryland and T.E. Hostrander; who was Substation Insprector. It was concluded that "... 1.23 inches of precipitation occurred in an estimated period of one-minute or less." The recording rain gauge chart (shown below) indicates that at chart time 3:23+ the pen was at 2.47 inches on the chart scale and at chart time 3:32- it was 3.70 inches.