Thompson Creek Flood Study Report - City of Peterborough

Thompson Creek Detailed Flood Reduction Study
City of Peterborough
J-1 Minor system data and connectivity – Thompson Creek systems
J-2 Listing of major/minor system outlets – Thompson Creek systems
J-3 Major system data and connectivity – Thompson Creek systems
J-4 Major system rating curves – Thompson Creek systems
J-5 Catchbasin capture curves – Thompson Creek systems
J-6 Subcatchment data – Thompson Creek systems
J-7 Minor system data & connectivity – Otonabee River local drainage systems
J-8 Listing of major/minor system outlets – Otonabee River local drainage systems
J-9 Major system data and connectivity – Otonabee River local drainage systems
J-10 Major system rating curves – Otonabee River local drainage systems
J-11 Catchbasin capture curves – Otonabee River local drainage systems
J-12 Subcatchment data – Otonabee River local drainage systems
This data was obtained from the City’s Geographic Information System and Sewer
Database and was verified and supplemented as necessary through detailed field
surveys. In general, the field survey provided information on missing sewer inverts or
pipe sizes. Detailed information is provided in Appendix J-13.
4.4.3.2 Model Verification
Model verification consisted of simulating the flows from three measured rainfall
events from the monitoring period and comparing the results with measured flows at the
outlet from the storm sewer system at the intersection of Scollard Drive and Francis
Stewart Road. Of the eight local systems within the study area, this was the one system
chosen for monitoring. The events selected were the three largest recorded flows in the
April to June 2006 period. They included the same event as used for the OTTHYMO
model i.e. a storm which occurred at about 2:00 am on June 1, 2006. As previously
discussed, it was approximately a 1 in 2 year rainfall for its three hour duration. Hence
this was a significant event upon which to base the model verification. At the sewer
system outlet, the 3 events had flows of 0.32 m 3 /s, 0.18 m 3 /s and 0.76 m 3 /s respectively.
The recorded rainfalls for the three events at the City Hall gauge were input to the
OTTSWMM model of the Scollard Drive/Francis Stewart Road system and the
resulting flows estimated. City Hall data was used since it is recorded in 5 minute
intervals whereas the Trent University data is only recorded in 30 minute increments.
Table 4.4.4 compares the observed and simulated peak flows for the three events.
Figure 4.4.3 shows the observed and simulated hydrographs for the June 1, 2006 event.
14-06605-01-W01 City of Peterborough 51