Current Lake Projects

Current Delavan Lake Sanitary District Projects. (updated: 01/15/18)


BROWN’S CHANNEL PROGRAM

Brown Channel

 Third year of Pellet Application Results. (From South Shore Drive Bridge to Brown’s Bay. )

Date                                                    5/24/17           10/20/17

Average Sediment Depth (in)                24.12                12.72

Average Water Depth (in)                    46.44                47.64

 

Brown’s Bay

Third year of Pellet Application Results. (From Brown’s channel to Lake Bay.)

Date                                                    5/24/17           10/20/17

Average Sediment Depth (in)                11.74                8.76

Average Water Depth (in)                     51.6                 56.6

 

Summary of Brown’s Channel Results for 2017

 

Analyzed: 05/24/17 – 05/25/16, 09/27/17 – 10/03/17

Sample analyzed by Jamie Hackbarth and Deborah Lee, Microbiologist, AQUAFIX Sediment samples analyzed by Test America, Chicago.

Brown’s Channel seemed to have very clear water during this sampling time. There were lots of submerged aquatic plants still growing. Mostly Coontail or Eurasian watermilfoil with some Curly Leaf pondweed and watermeal. There did not appear to be any filamentous algal mats. There were also a lot of submerged dead leaves mostly by the inlet. 

Sediment at Inlet of channel

The percent of total solids and total volatile solids at the inlet has not changed much between 2016 and spring of 2017. It seems we have an increase by fall of 2017, probably due to the flooding events that occurred this summer. The total organic carbon seems to decrease over summer but increases in spring, probably due to incoming particles from run-off. I’m not certain why the total organic carbon decreased so much by fall 2017. Possibly the incoming solids were mostly inorganic particles. It is also possible that more of the organic solids had been washed down into the channel. The total nitrogen and total Kjeldahl nitrogen seems to have remained the same from 10/18/16 to spring of 2017. It may be that the total nitrogen is decreasing, or this may also be an effect of the flooding events moving sediment down the channel. Total phosphorus seems to have increased a little from 10/18/16. The metals appear to have decreased since the 10/18/16 sampling time, however, it vastly decreased by the fall 2017 sampling time. This may be yet another effect of flooding events in the area.

Sediment composite

The percent of total solids and total volatile solids for the composite has not changed much between 2016 and 2017. Generally, it seems that the Inlet sample has higher levels of total organic carbon than the composite sample, until fall 2017. Again, this could be due to very high incoming flows pushing sediment and nutrients thorough the channel. The total nitrogen and total Kjeldahl nitrogen levels in the composite did not really change between 2016 and 2017, and are similar to the inlet samples for these times. Total phosphorus has increased in the composite sample since spring 2017 and is much higher than the inlet sample for fall of 2017.

AQUAFIX Recommendation for 2018

 Continue with current treatment plan using a dose rate of Pellets of 45 lbs per acre and concentrate a good portion of the dose in areas of high sediment levels, especially at the inlet of channel.

The Lake Committee approved Pellet Program (Muck Reduction) for 2018. And the Town of Delavan, Town Board approved the program for 2018. First pellet application to start in May 2018 when water is above 55 degrees.

  

Town Park Project 1

From Lakeshore of Town Park (West side of Park). To South Shore Drive Then From South Shore Dr to County Hwy F Recommended in the Delavan Lake Watershed Implementation Plan.

Work to include: Vegetated Bio-swale, Cobblestone infiltration Channel, Energy Dissipation, Native Wetland Plantings. Vegetated infiltration swale with 12’ to 18” tall (un-mowed) perennial grass cover with taller native wetland plantings closer to lake shore; approx. 40’ x 50’ wetland

Bank Stabilization, Riprap Check Dams, Energy Dissipation Energy dissipation area approx. 15’ by 20’; 8” to 16” rounded glacial roc

Project Status: Lake Committee and Town Board has approved and awaiting DNR permit . Grant has been approved to begin the project in late Spring 2018. With completion Mid 2018

Other Current Lake Project by private subdivision

Viewcrest Channel. 2017 Pellet application for muck reduction. (1st Year)

Date                                                    5/24/17           10/20/17
Average Sediment Depth (ft)                4.91                3.83
Average Water Depth (ft)                      3.06                3.59

Ravenswood Subdivision. 2017 Pellet application for muck reduction near Boat lunch and Boat Marina (1st Year)

Date                                                    5/24/17           10/20/17
Average Sediment depth. (ft)                2.39                 1.18
Average Water Depth (ft)                    N/A               N/A

Average reduction 14.5 inches

Pellets are used to reduce muck in bottom of lake and reduce phosphorous in the water.

BROWN’S CREEK PROJECT

 DLSD  submitted to DNR. Brown’s Creek Planning Study.  (south of South Shore Dr) The study would look at the following creek Improvement: Parking, Walking paths, Observation Area, Removal of invasive plant species, Bank stabilization and Tree trimming to encourage non-invasive plant grown.   Awaiting information on what the DNR will approve. Grant funds received from DNR .

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