THE CORPORATION OF THE CITY OF PORT COQUITLAM

Flooding ~2~ > Nov 5/81

3. Glade Court - This area has had a history of
flooding problems and again there were several basements that were
flooded. However, the flooding in this case was confined to water
backing up from the storm sewers in those basements which are. below
the elevation of the street. At no time did the water rise high
enough in the Cedar ditch to prevent the drainage of the storm
sewer into it, although the storm sewer was surcharged above its
normal level.

4. Richmond Place - There was some water on the street
in Richmond Place and it appears that this was caused by excessive
runoff from the surrounding fields. To solve this problem we will
probably need to install additional catch basins so that the inlet
Capacity is increased,

5. Victoria Drive ~ There was some washing out of drive-
ways around culverts on the north Side of Victoria Drive and the
District Engineer has been asked to increase the size of those
culverts. The heavy flow across Victoria Drive caused water to
overflow one of the manholes in the Cressey Subdivision which is
under construction. This overflow was caused by that manhole not
being completed and the top being below the hydraulic gradeline.
Once the manhole is finished it will be a foot higher and this
should place it above the hydraulic gradeline.

' 6. Dominion Avenue - Tides were high for most of the
period during which the heavy rainfall occurred. The floodgates
were not able to open to drain the ditches and therefore all
drainage had to be done by pumping. Both new pumps were operating
continuously. Despite this the ditches were high throughout the
area and there was some flooding of land adjacent to the ditches
feeding into the Dominion Avenue outlet works. The new ditch from
Laurier Avenue which was done last year helped to provide good
drainage to that area. The new ditch construction which was under-
taken this year from the Highway to the golf course also helped. to
drain that area. However, as there is still an undersized culvert
to the golf course parking lot and also across Burns Road, this
ditch did not drain as fast as it should have. One new culvert is
available to be put across Burns Road and we have a bridge which
we will be using to replace the culvert to the golf course parking
lot. Further work required will be the widening and dyking of the
ditch between Burns Road and the outlet works. ‘This is a major
project requiring acquisition of additional right-of-way for the
ditch, dyking, and ultimately a separation structure at the outlet