Water and Sediment Control Basin in Fond du Lac County, WI
Fond du Lac County, Land & Water Conservation Department
Basin Program Funds:
In the Lake Winnebago East Priority Watershed on the Lake Winnebago shoreline, nonpoint source pollution is still being delivered to the Lake at unrestricted rates due to the sloping topography. To reduce the sediment and nutrients that reach the lake, we have found a site that would benefit from a water and sediment control basin.
State cost-share dollars for the proposed sediment control basin Best Management Practice (BMP) would only cover a portion of the installation cost. Remaining installation costs will covered by the landowner. The participating landowners are familiar with a prior demonstration sediment control basin project installed during the summer of 1998 under a prior grant from the Basin Program. They understand the long-term benefit to the environment of the installation of another control basin in their area, but due to current uncertain economic conditions, the fractional cost out weighs the immediate benefit to them and their property. Thus, additional funding is being sought for this project.
The installation of the water and sediment control basin proposed in this project is on private land owned by a participating landowner in the Lake Winnebago East Watershed. A Land & Water Conservation Department (LWCD) technician using Natural Resource Conservation Service standards and specifications surveyed and design the project. The finished design was sent to the Department of Agriculture, Trade and Consumer Protectionís area engineer for approval. Needed permits from other agencies, municipalities, etc., were obtained. The project was bid out to qualified contractors in the area, and awarded to the lowest bid. LWCD personnel laid out the basin prior to the start of the project, and were on site to supervise construction.
The BMPs proposed to address soil erosion and sedimentation in this proposal will fulfill these RAP recommendations by reducing the excessive sediment load that disturbs aquatic habitats and by decreasing the input of nutrients associated with the sediment. This projectís goal is to fulfill RAP recommendations toward de-listing of two (2) Beneficial Use Impairments (BUIs): 1) Loss of Fish and Wildlife Habitat and 2) Eutrophication and Undesirable Algae.
The primary project goal was to stabilize and stop the creation of flashy channels during rainfall events and thereby reduce the nonpoint source pollution load to the Lake Winnebago system. This has been accomplished through the installation of the water and sediment control basin (WASCOB). Originally the fifty-one acre drainage area contributed a peak outflow of 77 cubic feet per second (CFS) for a 10 year, 24 hour rainfall event. After the installation of the WASCOB the peak outflow for that same 10 year, 24 hour rainfall event was cut by 25%, leaving 7.4 CFS to flow through the water control pipe and 50.3 CFS to flow over the primary spillway. This outflow reduction will thus allow time for the existing eroded channel to naturally heal and stabilize. The amount of soil saved both above and below the WASCOB equals 228 tons/year. This resulted in 2,280 lbs/phosphorus/year saved and 456 lbs/nitrogen/year saved.
Contact: Mr. Ryan Rice, 920-923-3033 ex124