Thompson Creek Flood Study Report - City of Peterborough

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.
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