08.21.23 MEETING MINUTES - Laserfiche WebLink

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Minutes of the Regular Meeting of Council Monday, August 21, 2023 Page 5 based on the model, we did not see it was going to be entering any homes. With that in mind, that's how we develop those alternatives. During the 100 year event which is shown in this image here, basically the 100 year storm event is illustrated by this dark purple color here. What we noticed is that the 100 year storm event, again based on the modeling, is that we would expand that flood plain. It would get up against the houses but it would not enter the houses either through the doorways or windows. We would have flooding there, but again, it would not be impacting the buildings. We would have further inundation of the roadways. That's why we wanted to develop these alternatives, to deal with the roadways and to deal with that house. I mention the house because of its location. It was advantageous for us to take that down and use it as an area for the floodplain. As I mentioned, on August 11 th and 121h, we had a two year storm event. About 2.6 inches of rain fell during that 24 hour period. We were fortunate enough that the homeowner at 971 Worton Park Drive took some photos for us so we could see what the extent of the flooding was. We saw how that looked in relation to the maps that we have for that particular event. To the west of this on the left would be where that floodplain is. The middle there would be the Beecher's Brook channel itself. This is looking northeast eventually towards Worton Park Drive. What we are seeing here is flooding in the middle there and a lot of flooding approaching the houses in this area. Just take a look at where the water is. Basically it looks like that was the extent of the flooding in this particular area. When we compare that to what we saw in the model, we seem like we are getting a correlation between the model where the boundary was based on this photograph. Again, you look at both the channel going through there and the flood going on the backyards. When you look to the southwest what you are looking at here is a new crossing at North Woodlane Drive and you see the floodplain that was created with the purchase and demolition of the house on this parcel. What was interesting to see with this photograph is that North Woodlane Drive right where the crossing is appears to not be overtopped by any large amount of water that would be a concern of getting the police, fire and ambulatory in there. And also for residents to be able to go in and out. What we didn't know and we again appreciate the homeowner for providing this, is that if you look a little bit to the west you can see some overtopping occurring both over North Woodlane Drive and working its way northeast towards this image to a new floodplain area. What we believe is happening there is that there are two driveway crossings in that location. Those are actually slated to be upsized as part of the Phase II work that Tom is looking at right now. Once that takes place, we do expect that we will no longer see this overtopping of North Woodlane Drive as you can see in this image. To give you an idea of what we are looking at in terms of Phase II, in this image, what we are looking at doing is upsizing the crossings at Norman Lane, South Woodlane Drive, Woodlane Drive and then the two driveways just to the south of North Woodlane Drive. In addition to that, there's an area of extensive erosion that is coming near the home at 6206 North Woodlane Drive. We are looking at doing some stabilization there to prevent that from further eroding towards that home. There is a hope that with the crossing on Woodlane Drive, by expanding the floodplain there, the water will slow down so we can manage the water as it goes through the neighborhood.