Water and Wastewater Systems: 2018 and Beyond Town of Beaumont â€“ Report FINAL 4.2.3 Rainfall Statistics Rain gauge data was obtained from the Town, in order to review the recorded amount of precipitation accumulated during rainfall events. The main purpose of this data was to determine wet weather periods, and to correlate the observed rainfall with the peak wet weather flows recorded at each of the selected flow monitoring locations. The recorded rainfall data also allowed for an assessment of each rainfall event in order to determine their return periods. As some of the analysis is based on simulating a design storm with a specific return period (either the 1:5, 1:25, or 1:50 year 24-hour Huff storms in this case) using a calibrated model, this information becomes useful when comparing the assessment results to the observed results. The rainfall data for both 2014 and 2016 was analyzed to establish the total rainfall depths and return period of each major recorded rainfall event. The total rainfall depths observed during the 2014 and 2016 flow monitoring period are presented in Figures 4.8 and 4.9, respectively. The top ten major rainfall events in terms of intensity are listed below in Table 4.5 for both 2014 and 2016. Figure 4.10 illustrates the top ten major recorded rainfall events along with their determined return periods for the 2014 and 2016 flow monitoring periods. Top Ten Rainfall Events of 2014 and 2016 2014 Rainfall ID Date 2016 Return Period Rainfall ID Date Return Period 1 6/28/14 2:05 PM <2 Year 11 6/23/16 2:15 AM <2 Year 2 6/29/14 1:15 PM <2 Year 12 6/30/16 2:50 PM <2 Year 3 7/5/14 4:20 AM 2 Year 13 7/3/16 5:20 AM <2 Year 4 7/6/14 12:30 AM <2 Year 14 7/10/16 11:45 PM <2 Year 5 7/17/14 9:35 PM <2 Year 15 7/13/16 6:45 PM <2 Year 6 7/19/14 11:05 PM <2 Year 16 7/15/16 4:10 PM <2 Year 7 7/20/14 1:55 PM <2 Year 17 7/26/16 5:35 PM <2 Year 8 7/26/14 10:20 AM 25 Year 18 7/30/16 2:25 AM <2 Year 9 9/1/14 6:55 PM <2 Year 19 7/30/16 7:25 PM 2 Year 10 9/26/14 2:30 PM <2 Year 20 8/22/16 12:30 PM <2 Year islengineering.com April 2018 | Page 35