Current Lake Projects
TOWN OF DELAVAN LAKE PROJECTS (updated: 01/24/18)
BROWN’S CHANNEL PROGRAM
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
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.
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.
TOWN OF DELAVAN AND DELAVAN LAKE SANITARY DISTRICT (DLSD) PROJECTS
Mound Road Ponds Project (updated 3-23-18)
The Town of Delavan and Delavan Lake Sanitary District have agree to a Test Project for 2018 to apply Muck Reduction Pellets to the ponds in the Mound Road Watershed. Project Details The test program (Mound Road Ponds) would use the pellets in place of dredging the ponds. It is estimated that the dredging of the ponds is estimate to cost over a half million dollars compared to an estimated cost of thirty thousand dollars. T
The project is expected to start in May when the water temperature reaches 60 degree. Using the water depth measurement from different water depths (number of samples dependent on pond chosen) four composite samples would be taken from each of the ponds. For example, in the east pond we would take samples from the 1-3’ depth range and samples from the 3-5’depth range. We would then mix this collected sediment from given depth-ranges to form an aggregate or composite sample. All samples sites would be plotted using GPS for re-sampling. An initial (2) samples would be taken prior to project start-up and a final (2) samples taken at least 4 weeks following the final pellet application in late Sept. Each composite sample would be laboratory-tested for: total solids, total volatile solids, organic carbon, total nitrogen and total phosphorus.
Daily precipitation is monitored by the Delavan Sanitary District and these measures would also be used to judge efficacy. Pellets would be applied each month May through September for total of 5 applications. Final Report on the results will be available November 2018.
Inlet Channel Program
In addition, a second test project the “Inlet Channel Program “ (which is the Delavan Lake Inlet east of the Hwy 50 Bridge) to use the same program as above and apply pellets to the Inlet Channel. The total cost for the two projects (Mound Road Ponds and the Inlet Channel Test Program) would be approx. $28,000.00. The total cost would be bored on a 50/50 basis by The Town of Delavan and Delavan Lake Sanitary District. After a review of the two project test results the project would then be reconsidered for renewal in 2019. Monthly results will be reported on this site.
DELAVAN LAKE SANITARY DISTRICT (DLSD) PROJECTS
BROWN’S CREEK PROJECT (2-9-2018)
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 .
Study was completed in 2017 and the final plan can be accessed on the DLSD’s website or paper copies are available at the DLSD office or the Town Hall.
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