Thompson Creek Flood Study Report - City of Peterborough

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Thompson Creek Detailed Flood Reduction Study City of Peterborough The one location where flooding may be of concern is at the low point on Armour Road just south of Whitaker Street. City staff reported that this location overtopped during the July 2004 storm. The OTTSWMM modelling indicates potential flooding from the road drainage system or by surcharging/insufficient inlet capacity of the main sewer system. The drainage system at this location is quite complex with several large areas converging on the east side of Armour Road in a low area. There is an inlet to the system to pick up overland drainage from the adjacent condominium development and a partially blocked culvert under Armour Road. Potential means of improving this system are discussed in Section 5.3. 3. Armour Road south of Moir Street and Moir Street system – this system drains to an outfall at the end of Moir Street. Table 4.6.3 shows potential depths of flow in the major system for this area for the 1 in 2 year to 1 in 100 year storm. Drawing SF-2 identifies the extent of potential flooding for the 1 in 100 year event. As indicated, the OTTSWMM modelling suggests a potential for flow depths along Armour Road to overtop the curb for relatively frequent events (e.g. 1 in 2 year). However, depths are such that although the area west of the road is relatively flat, buildings would probably not be impacted until events greater than the 1 in 100 year event. Since the land generally slopes away from the road towards the Otonabee River, any flow which overtops the high point adjacent to the buildings would spill down towards Lisburn Street and travel overland to the river. This could potentially cause flooding of the buildings which front on Lisburn Street. A similar spill is also indicated at the corner of Moir Street and Lisburn Street but this would drain overland to the river without impacting any structures. 4. Spencleys Lane, Vinette Street system – this system also drains the south part of Lisburn Street and a small area of Armour Road to an outfall to the Otonabee River at the end of Vinette Street. No potential flooding is indicated by the OTTSWMM model within this system for the 1 in 2 year to 1 in 100 year storm. 5. Dunlop Street system – this system also drains a small area of Armour Road to an outfall to the Otonabee River at the end of Dunlop Street. No potential flooding is indicated by the OTTSWMM model within this system for the 1 in 2 year to 1 in 100 year storm. 14-06605-01-W01 City of Peterborough 81
Thompson Creek Detailed Flood Reduction Study City of Peterborough Street Segment # Fig. 4.3.1 Table 4.6.3 Depth of Water for 1 in 2 Year to 1 in 100 Year Storm in Moir Street Area 2-Year 1-hour AES Max. Max Flow Depth (m 3 /s) (mm) 5-Year 1-hour AES Max. Max Flow Depth (m 3 /s) (mm) 10-Year 1-hour AES Max. Max Flow Depth (m 3 /s) (mm) 25-Year 1-hour AES Max. Max Flow Depth (m 3 /s) (mm) 50-Year 1-hour AES Max. Max Flow Depth (m 3 /s) (mm) 100-Year 1-hour AES Max. Max Flow Depth (m 3 /s) (mm) 2801 0.06 34 0.08 37 0.10 40 0.12 44 0.15 48 0.17 51 2802 0.09 38 0.12 44 0.16 49 0.20 56 0.25 62 0.29 65 2803 0.11 41 0.16 49 0.21 57 0.26 63 0.33 67 0.39 71 2804 0.18 63 0.27 71 0.36 79 0.46 88 0.56 95 0.64 100 2805 0.17 61 0.26 70 0.36 79 0.47 90 0.60 97 0.71 103 2807 0.18 62 0.28 72 0.39 82 0.53 94 0.69 102 0.82 109 2808 0.12 126 0.21 157 0.31 182 0.44 207 0.60 231 0.74 249 2809 0.07 104 0.14 135 0.22 161 0.33 187 0.47 212 0.61 232 2811 0.09 113 0.14 134 0.20 156 0.32 185 0.43 205 0.60 231 2812 0.05 36 0.07 40 0.09 45 0.15 57 0.24 68 0.30 74 2813 0.05 27 0.07 32 0.09 34 0.12 38 0.20 47 0.26 53 2814 0.02 12 0.03 20 0.05 29 0.07 33 0.13 38 0.17 43 6. Parkhill Road East system – this system also drains a small area of Armour Road to an outfall to the Otonabee River near the Parkhill Road bridge. No potential flooding is indicated by the OTTSWMM model within this system for the 1 in 2 year to 1 in 100 year storm. 4.6.2.2 Volume Events for Flood Vulnerability Mapping Areas within Thompson Creek Watershed The following section discusses the results for the simulations of the 40 mm and 60 mm volume based events for the three separate storm sewer systems within the Thompson Creek watershed. The results are generally very similar to those for the 1 in 2 year to 1 in 100 year storm. Waverley Heights – flooding is indicated for the same two locations within the existing Waverley Heights subdivision described in Section 4.6.2.2. Table 4.6.4 shows the predicted depths of water for the 40 mm and 60 mm events for the two locations. 14-06605-01-W01 City of Peterborough 82
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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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4a 4b 4c Reach #4 Assessment Locati
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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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Thompson Creek Flood Study Report - City of Peterborough

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