Thompson Creek Flood Study Report - City of Peterborough

Thompson Creek Detailed Flood Reduction Study
City of Peterborough
4.6.2.1 Return Period Events for Flood Damage Estimation
Areas within Thompson Creek Watershed
As indicated in Section 4.3.1, there are three separate storm sewer systems within the
Thompson Creek watershed: the Waverley Heights system with two outfalls, the
Armour Road system with several outfalls and the Ashdale Crescent system.
Waverley Heights – there are two locations within the existing Waverley Heights
subdivision where the modelling indicated that water would pond on the street to
unacceptable levels under some circumstances:
1. Corner of Scollard Drive (near intersection with Francis Stewart Road)
Extensive ponding of water at this location was reported by the residents of
Scollard Drive at the Public Information Centres for both this study and the
Master Flood Study which proceeded it. Table 4.6.1 indicates the depth of
water for the 1 in 2 year to 1 in 100 year storms. Based upon this information,
the depth would exceed the curb level for a 1 in 10 year storm. However, as
indicated in Photograph 4.6.1, the majority of the affected area (the west side of
the street) is actually driveway rather than curbs. Hence the water ponds up the
driveways for much more frequent events. In addition, the modelling does not
account for blockage of the catchbasins in this area which would increase the
frequency of ponding. Drawing SF-1 shows the estimated extent of flooding
for the 1 in 100 year storm. As indicated, the lots affected slope toward the
street at the front but away from the road beyond the houses. Hence once the
water reaches a depth of about 0.5 m to 0.75 m, it would spill around the houses
and generally flow towards the golf driving range located west of these
properties.
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