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 Table 4.6.1 Depth of Water for Scollard Dr. and Eldon Crt. for 1 in 2 to 1 in 100 Year Storm 2-Year 1-hour AES Max. Max Flow Depth (m 3 /s) (mm) Eldon Court & Francis Stewart Road 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) 2101 0.06 39 0.09 44 0.11 49 0.14 54 0.16 60 0.18 62 2102 0.07 35 0.10 40 0.13 44 0.17 51 0.21 58 0.25 62 2103 0.08 42 0.11 49 0.14 55 0.17 61 0.20 64 0.22 66 2104 0.09 114 0.14 135 0.20 154 0.27 173 0.35 189 0.40 200 Scollard Drive 2408 0.09 32 0.15 37 0.20 41 0.31 50 0.41 59 0.50 63 2409 0.05 28 0.09 34 0.13 38 0.22 46 0.31 55 0.39 62 2410 0.09 115 0.16 141 0.25 166 0.38 195 0.52 220 0.65 238 Francis Stewart Road near Scollard Drive Intersection 2415 0.12 50 0.17 61 0.23 67 0.30 74 0.38 81 0.44 86 2416 0.09 43 0.13 54 0.18 63 0.26 70 0.34 77 0.40 83 Photograph 4.6.1: Flood Susceptible Area- Scollard Drive 14-06605-01-W01 City of Peterborough 77
Thompson Creek Detailed Flood Reduction Study City of Peterborough The problem occurs at this location for several reasons: there is an extensive drainage area upstream of this location (approximately 6.5 hectares) the road east of this location slopes steeply down to this point causing flow on the street to travel rapidly down to this point and probably reducing the efficiency of the upstream catchbasins in capturing flow the road north of this location slopes back from the intersection of Scollard Drive and Francis Stewart Road forming a low point at the west side of the corner. Although there are two catchbasins on either side of the street, they do not have sufficient capacity to accept all the flow and, based on field observations, are probably subject to blockage by debris during storm events there is no defined overland flow route to the west of this point to safely convey the accumulated flow past the affected houses. Based on the extent of flooding and the number of properties affected, a solution to this problem was identified as discussed in Section 5.1. 2. Northwest Corner of Intersection of Eldon Court and Francis Stewart Road Local residents reported that relatively frequent ponding of water occurs at the corner of Eldon Court and Francis Stewart Road (See Photograph 4.6.2 for location). The OTTSWMM modelling confirms that this is the case. Drawing SF-1 shows the extent for the 1 in 100 year storm. It was estimated that ponding would be initiated for storms between a 1 in 2 year and 1 in 5 year magnitude (see Table 4.6.1). However, this does not allow for blockage of the catchbasins in the area which probably occurs relatively often based on field observations. The problem occurs at this location because Eldon Court slopes towards the intersection with Francis Stewart Road although the latter street is higher than the intersection on both the east and west sides of the intersection. Hence there is a low point at this location. The storm sewer on Eldon Court drains in the opposite direction to the slope of the street hence all the flow from the street must enter the sewer at the noted low point. During heavy storms, the catchbasins at this location do not have sufficient capacity and are probably subject to relatively frequent blockage by debris. 14-06605-01-W01 City of Peterborough 78
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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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