Fountains spray water above the water surface whereas aerators are fully subsurface systems. The benefits of fountains are similar to aeration systems- they avoid stagnant water conditions and help maintain localized oxygen levels in the water column. The use of this technology will require a mechanical aquatic plant management permit to avoid deleterious impacts on the native aquatic plant community. The suction device basically serves as a conveyor to a boat or shore station where the target species is isolated and disposed of. Diver-Assisted Suction Harvesting (D.A.S.H.)ĭASH utilizes a similar suction device as suction harvesting, but the device is solely used to transport hand-picked target species by a diver to the surface, without the diver surfacing with the target species. Any removal beyond the 30 feet would require a permit. If the area being mowed is confined to a single area with a maximum width of no more than 30 feet measured along the shoreline provided that any piers, boat lifts, swim rafts and other recreational and water use devices are located within that 30-foot-wide zone and may not be in a new area or added to an area where plants are controlled by another method. Mowing with a push lawnmower on exposed lakebed is exempt from a NR 109 permit. Visit beach maintenance for additional information on managing invasive plants, or visit water permits to apply for permits to drive motorized equipment on beaches. Permits may also be needed to drive motorized equipment on beaches to manage for invasive plants growing on the exposed lakebed. Visit water permits to apply for an individual permit. If the mowing activity requires motor vehicles to be driven on a lakebed to groom or mow the shoreline, an individual permit may be required. See the shoreline maintenance exemption checklist for more information. Mowing vegetation along coastal waters may be exempt from permitting. If any of the above conditions are not met, visit water permits to apply for a miscellaneous structure permit. the prop does not cause problems for lake users or neighbors.the mixing action does not disturb the lake bottom and.the prop is attached to a legal structure that has either received a permit or is exempt from needing a permit.Although the department does not advocate for aerators, a permit is not required to install or maintain these devices so long as the following conditions are met: This can adversely impact other riparian owners and members of the public who may be recreating on the water. This has the potential to push algal mats to other parts of the lake or river. These systems typically require placing a single base or tubular structure on the lakebed to push air or water through the water column so that water is continually moving, avoiding stagnant water flow conditions. ![]() AeratorsĪeration systems can help increase the localized dissolved oxygen levels in the water column and circulate water to prevent algal buildup. Applicants are responsible to check with local county zoning staff to seek applicable county permits. It is important to note that county zoning permits may also be required for the placement of these structures, or for electrical housing units that may be needed to support structural aquatic plant management units. Contact your local aquatic plant management coordinator or waterway resource management specialist before engaging in any aquatic plant management or nuisance control activities. Removal of aquatic or riparian plants through hand removal, mechanical harvesting, raking or cutting may also require a mechanical aquatic plant management permit. As a general rule of thumb, DNR permits are required if you are placing a structure in the water or disturbing the lake or river bottom.
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