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    Harvesting or Hydro-raking... Which Mechanical Solution Is Best?

    by: SOLitude Lake Management   |   Sep 29, 2019


    Written by Industry Expert Jeff Castellani, Director of Mechanical Operations

    Rarely is there one specific remedy for the restoration of a waterbody. Restoration often requires a multiyear management program encompassing a combination of aquatic management tools and techniques, such as herbicide and algaecide treatments, nutrient remediation, aeration and biological augmentation. Mechanical removal is an additional management method that may be incorporated into a restoration program, and has a number of ecological benefits including nutrient mitigation, water circulation and open water habitat restoration.

    Mechanical aquatic weed removal services encompass two distinct management tools and approaches: aquatic weed harvesting and hydro-raking. While both provide ecological benefits, it is important to distinguish which option is better-suited for the specific management objectives of your lake or pond.

    The aquatic weed harvester is a floating barge that cuts and effectively removes nuisance vegetation and algae from the surface of the waterbody. The plant material is collected and then offloaded, either into a container to be transported offsite or to a designated onshore compost area.

    Mechanical lake weed removal offers an eco-friendly solution that does not create temporary water use restrictions during or after the work. For sensitive aquatic ecosystems, it can act as an alternative to herbicides. Mechanical harvesting can be an ideal management option for annual plants that are invasive or at nuisance levels. The aquatic weed harvester has been proven effective on water chestnut, giant salvinia, water soldier, and water hyacinth.

    Mechanical Harvester 

    The hydro-rake is also a floating barge run by two hydraulic paddle wheels, but is equipped with a 12-foot hydraulic arm with a rake attachment that is used to rake the pond bottom and remove detritus, organic sediment and aquatic vegetation with attached root systems. The hydro-rake, having no on-board storage, must offload the collected material directly onshore or onto a transport barge for removal.

    Hydro-raking can be an effective alternative to herbicide and algaecide applications, but it has also proven effective in unison with these treatments. When managing emergent or floating leaf species, such as Phragmites or water lily, herbicide application is often the first management approach, followed by hydro-raking. Hydro-raking is commonly utilized after control, to collect the plant biomass and associated root structure, negating it from contributing to the organic matter substrate below. This approach has proven effective on a number of aquatic plants such as cattails, purple loosestrife, pickerelweed, watershield, and Alligator weed.

    Hydro-raking can also serve as a more environmentally friendly and cost effective alternative to dredging. Additionally, if a lake or pond is periodically maintained through hydro raking, the need to perform a large scale dredge project may be negated, saving financial resources and prolonging ecological disruption in the process.

    Mechanical Hydro-rake

    Both aquatic weed harvesting and hydro-raking collect plant biomass before it decomposes and contributes to the organic muck layer, maintaining or increasing overall water depth. In addition to the plant biomass, these mechanical options remove the associated nutrients (phosphorus and nitrogen) that contribute to increased plant and algae growth and, potentially, eutrophication.

    These management techniques are used in a wide variety of projects on private, public and state waterbodies to help maintain or restore the open water space of shorelines, coves, inlets and outlets. Depending on the lake management objective and the target aquatic species for control, mechanical projects are usually part of a multiyear program. The next time you look out at your lake or pond, remembering its former attributes and beauty, consider investigating how mechanical lake weed removal services can be applied to help restore balance to your aquatic ecosystem.

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    Contact the experts at 888-480-LAKE (5253) for all of your lake, stormwater pond, wetland and fisheries management needs. 

    jeff-castellani-web-newJeff Castellani serves as Director of Mechanical Operations at SOLitude. He leads SOLitude’s mechanical division with invasive weed control services, surveys, reports, proposals and GIS mapping. Jeff is a licensed applicator in many states across New England and maintains licensing and industry certificates for Construction Supervisor, OSHA, Qualified Rigger and Signal, as well as Boater Safety. Jeff is a graduate of Southern New Hampshire University

    SOLitude Lake Management is a nationwide environmental firm committed to providing sustainable solutions that improve water quality, enhance beauty, preserve natural resources and reduce our environmental footprint. SOLitude’s team of aquatic resource management professionals specializes in the development and execution of customized lake, stormwater pond, wetland and fisheries management programs that include water quality testing and restoration, nutrient remediation, algae and aquatic weed control, installation and maintenance of fountains and aeration systems, bathymetry, shoreline erosion restoration, mechanical harvesting and hydro-raking, lake vegetation studies, biological assessments, habitat evaluations, and invasive species management. Services and educational resources are available to clients nationwide, including homeowners associations, multi-family and apartment communities, golf courses, commercial developments, ranches, private landowners, reservoirs, recreational and public lakes, municipalities, drinking water authorities, parks, and state and federal agencies. SOLitude Lake Management is a proud member of the Rentokil Steritech family of companies in North America.

    Topics: Water Quality/Nutrient Remediation, Aquatic Weeds and Algae