COD - Pond 9 and Pond 7 - Storm Sewer Connection Hoddinott Wildlife Area

This post will include a video taken on April 26, 2013 shortly after the recent flooding and overtopping of COD's Pond #7 and Wheaton's Lake #4.

There is an underground storm sewer connection from Pond #9 into the Hoddinott Wildlife Area and water of Pond #9 flows into the marsh and Pond #7 via that connection. This was installed by the college in 2012, and the video shows some of the details of that storm sewer.

When overtopping of Pond #9 occurs that water flows above ground and downhill into Pond #7. When this overtopping occurs there is water flowing into Pond #7 from two discharge points on COD's retention pond #9. These discharge points are shown in the video.

Pond #7 is separated from Lake #4 by a berm which includes a weir. There is normally water flow from Pond #7 to Lake #4. However, during rain the level of Pond 7 rises and Lake #7 and the pond become one large body of water.

The area of the video is in the lower left hand corner of this site plan. Pond #9, the CMC building and parking occupy former low lying soccer practice fields which did retain water in the past. The area on this site plan which is tagged "Wetland 2" is the Hoddinott sanctuary and Pond #7.

Here's a photo of the same area in September 2008 after the severe storms. It shows the standing water and the same area now occupied by parking, the CMC building, Pond #9 and the berms on the west side of that pond:

Here's a photo of the area to the south of Pond #9 during construction and prior to the CMC building. The view is facing toward the east. This shows the area that I walked into the Hoddinott Wildlife Area in the video. It also shows the new storm sewer connection constructed by the college and ending in the marsh. In the video link included in this post I walk the route of the storm sewer installed in 2011-12 and shown in the photo below. (It runs from north to south, which in this photo is from left to right, and discharges  at the tip of pond 7 in the photo of the marsh).

The area above and in the video is a "freshwater emergent wetland" according to the "National Wetlands Inventory." Additional information on wetlands, the codes shown on the diagram and the Illinois Wetlands Act of 1989 can be found in my post of May 10, 2013. Here's the wetland diagram for the western portion of the COD campus and BLMH:

And finally, here is the video. Pond #9 and the CMC building are incomplete and are under construction:

Notes:

1. This is another in a series on the flooding of April 18 and the contributing factors. 

2. Clicking on the photos will enlarge them.