Thompson Creek Flood Study Report - City of Peterborough

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Thompson Creek Detailed Flood Reduction Study City of Peterborough Street Segment # Fig. 4.3.1 2-year 1-hour AES Max. Flow (m 3 /s) 5-year 1-hour AES Max. Flow (m 3 /s) 10-year 1-hour AES Max. Flow (m 3 /s) 25-year 1-hour AES Max. Flow (m 3 /s) 50-year 1-hour AES Max. Flow (m 3 /s) 100-year 1-hour AES Max. Flow (m 3 /s) 2707 0.24 0.34 0.41 0.49 0.58 0.65 2711 0.00 0.00 0.00 0.01 0.01 0.01 2801 0.15 0.22 0.27 0.38 0.47 0.54 2802 0.09 0.15 0.20 0.26 0.32 0.37 2803 0.06 0.08 0.10 0.12 0.15 0.17 2804 0.09 0.12 0.16 0.20 0.25 0.29 2805 0.11 0.16 0.21 0.26 0.33 0.39 2807 0.18 0.27 0.36 0.46 0.56 0.64 2808 0.17 0.26 0.36 0.47 0.60 0.71 2809 0.18 0.28 0.39 0.53 0.69 0.82 2811 0.12 0.21 0.31 0.44 0.60 0.74 2812 0.07 0.14 0.22 0.33 0.47 0.61 2813 0.09 0.14 0.20 0.32 0.43 0.60 2814 0.05 0.07 0.09 0.15 0.24 0.30 2900 0.05 0.07 0.09 0.12 0.20 0.26 2901 0.02 0.03 0.05 0.07 0.13 0.17 2902 0.03 0.04 0.05 0.06 0.07 0.08 2910 0.05 0.07 0.08 0.11 0.13 0.15 2911 0.07 0.10 0.13 0.16 0.20 0.23 2912 0.04 0.06 0.07 0.10 0.12 0.14 2921 0.07 0.10 0.13 0.17 0.20 0.23 2922 0.06 0.09 0.12 0.16 0.20 0.24 2925 0.11 0.15 0.19 0.27 0.34 0.40 2500 0.07 0.12 0.16 0.26 0.32 0.42 2501 0.04 0.07 0.12 0.20 0.25 0.36 2502 0.05 0.07 0.09 0.12 0.14 0.16 2503 0.03 0.05 0.07 0.09 0.12 0.13 2504 0.02 0.04 0.06 0.08 0.11 0.12 2505 0.02 0.04 0.05 0.08 0.10 0.11 2506 0.03 0.05 0.06 0.08 0.10 0.12 2507 0.05 0.07 0.08 0.11 0.14 0.17 2508 0.02 0.04 0.05 0.07 0.10 0.11 2510 0.03 0.04 0.05 0.07 0.09 0.11 2514 0.02 0.03 0.04 0.06 0.08 0.10 2515 0.02 0.03 0.03 0.04 0.05 0.06 2516 0.02 0.02 0.03 0.04 0.04 0.05 2520 0.11 0.16 0.20 0.26 0.31 0.35 2526 0.07 0.10 0.13 0.15 0.19 0.21 2527 0.09 0.13 0.17 0.23 0.28 0.32 2528 0.14 0.20 0.25 0.31 0.36 0.40 2600 0.03 0.04 0.05 0.06 0.07 0.08 2601 0.11 0.17 0.22 0.28 0.34 0.39 2602 0.02 0.04 0.05 0.07 0.09 0.10 2604 0.08 0.11 0.14 0.18 0.22 0.26 2605 0.10 0.15 0.19 0.24 0.30 0.35 2606 0.01 0.02 0.02 0.03 0.03 0.04 2608 0.14 0.21 0.25 0.34 0.42 0.49 2607 0.12 0.19 0.23 0.32 0.42 0.49 2609 0.03 0.05 0.07 0.09 0.11 0.12 14-06605-01-W01 City of Peterborough 69
Thompson Creek Detailed Flood Reduction Study City of Peterborough 4.5.3.2 Volume Events for Flood Vulnerability Mapping The verified OTTSWMM models of the local drainage systems in the Thompson Creek study area (discussed in Section 4.4.3) were used to simulate flows for the six volume based events required by the Terms of Reference, as discussed in Section 4.5.1.2. Because of the very small drainage areas involved, the one hour AES distribution was used for all events except the 193 mm event. For the latter, the Timmins Storm distribution was applied. Table 4.5.14 indicates the resulting peak flows for the local drainage systems within the Thompson Creek watershed. Table 4.5.15 shows the resulting peak flows for the local drainage systems which drain directly to the Otonabee River. By comparison with Table 5.4.12 and 5.4.13, it is noted that flows for the 80 mm, 100 mm and 120 mm events significantly exceed those for the 1 in 100 year event. It was estimated, in fact, that the return periods of the 1 hour storms with depths of 80 mm, 100 mm and 120 mm are approximately 1 in 390 year, 1 in 1,100 years and 1 in 2,500 years. These far exceed the normal range of return periods used for the “level of protection” for local drainage systems. Hence in mapping the extent of local flooding only the 40 mm and 60 mm events were considered. Again, the major system flow information from the OTTSWMM model was used to calculate flow depths and identify the extent of any local flooding for those two events. The results are described in Section 4.6.2. 4.5.3.3 Peterborough Storm of July 14 – 15, 2004 The verified OTTSWMM models of the local drainage systems in the Thompson Creek study area (discussed in Section 4.4.3) were used to simulate flows for the storm of July 14 – 15, 2004. The rainfall hyetograph used was as described in Section 4.5.1.1. Table 4.5.14 indicates the resulting peak flows for the local drainage systems within the Thompson Creek watershed. Table 4.5.15 shows the resulting peak flows for the local drainage systems which drain directly to the Otonabee River. Again, the major system flow information was used to calculate flow depths and identify the extent of any local flooding. The results are described in Section 4.6.2. 14-06605-01-W01 City of Peterborough 70
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THOMPSON CREEK DETAILED FLOOD REDUC
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Thompson Creek Detailed Flood Reduc
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REACH 1 STATION 1 Otonabee River ST
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NOT CLASSIFIED FOD7-7 FOD7-7 CUW CU
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M:\Jobs\2006\14.06605.01.EN1 - Thom
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AES Type 2 Duration = 6 hrs Return
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AES Type 2 Duration = 1 Duration Vo
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480 0.00 490 0.03 500 0.26 510 0.54
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1500 2.97 1510 2.43 1520 2.25 1530
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LEGEND EXISTING CATCHBASIN LOCATION
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