Thompson Creek Flood Study Report - City of Peterborough
Thompson Creek Flood Study Report - City of Peterborough
Thompson Creek Flood Study Report - City of Peterborough
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<strong>Thompson</strong> <strong>Creek</strong> Detailed <strong>Flood</strong> Reduction <strong>Study</strong><br />
<strong>City</strong> <strong>of</strong> <strong>Peterborough</strong><br />
Table 4.5.5<br />
Peak Flows for <strong>Thompson</strong> <strong>Creek</strong> for 1 Hour AES Volume Based Storms<br />
Location Area 40mm 60mm 80mm 100mm 120mm<br />
(ha)<br />
#1 (<strong>Thompson</strong> Dam) 0 0.100 0.100 0.100 0.100 0.100<br />
#2 (Pond Outlet) 11.15 0.347 0.652 1.021 1.450 1.897<br />
#3 (Proposed Crossing) 38.32 0.729 1.585 2.507 3.654 4.857<br />
#4 (Armour Road) 48.72 0.956 2.059 3.321 4.863 6.313<br />
#5 (Otonabee River) 66.32 1.597 2.980 4.624 6.790 9.040<br />
The former case was simulated to give a direct comparison to the other volume based<br />
storm events and the return period events. Table 4.5.6 presents the resulting peak flows<br />
for <strong>Thompson</strong> <strong>Creek</strong> for the 193 mm storm.<br />
Table 4.5.6<br />
Peak Flows for <strong>Thompson</strong> <strong>Creek</strong> for 193 mm (Timmins) Storm<br />
Location<br />
Area<br />
(ha)<br />
Peak Run<strong>of</strong>f Rate<br />
(m 3 /s)<br />
193 mm<br />
Storm<br />
With<br />
SWM<br />
Pond<br />
193 mm<br />
Storm<br />
Without<br />
SWM<br />
Pond<br />
#1 (<strong>Thompson</strong> Dam) 0 0.100 0.100<br />
#2 (Pond Outlet) 11.15 0.648 0.648<br />
#3 (Proposed Crossing) 38.32 1.852 3.138<br />
#4 (Armour Road) 48.72 2.533 3.917<br />
#5 (Otonabee River) 66.32 3.612 5.043<br />
The calculated peak flows from the volume based events were input to the HEC-RAS<br />
model <strong>of</strong> <strong>Thompson</strong> <strong>Creek</strong> to calculate the corresponding water levels. Table 4.5.7<br />
shows the water levels for the 120 mm storm and the 193 mm (Timmins Storm).<br />
Mapping <strong>of</strong> the corresponding flood line is described in Section 4.6.1. Water levels for<br />
the 40 mm to 100 mm storms (which are all less than those indicated in Table 4.5.7 for<br />
the 120 mm storm) are presented in Appendix I with the HEC-RAS outputs.<br />
4.5.2.3 <strong>Peterborough</strong> Storm <strong>of</strong> July 14 - 15, 2004<br />
Table 4.5.8 shows the peak flows simulated with Visual OTTHYMO for the July 2004<br />
<strong>Peterborough</strong> Storm rainfall amount estimated to have occurred over the <strong>Thompson</strong><br />
<strong>Creek</strong> watershed (see Section 4.5.1.1). As indicated, peaks resulting from the estimated<br />
total rainfall <strong>of</strong> 233 mm are very similar to those for the Timmins Storm. Both are long<br />
duration, high volume but relatively low peak intensity storms. The calculated peak<br />
14-06605-01-W01 <strong>City</strong> <strong>of</strong> <strong>Peterborough</strong> 61
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