Diver Assisted Suction Harvesting

(DASH) Diver Assisted Suction Harvesting

War of the Weeds from Outdoor Idaho Public TV
http://idahoptv.org/outdoors/shows/waroftheweeds/do.cfm
http://idahoptv.org/outdoors/shows/waroftheweeds/resources.cfm
http://idahoptv.org/outdoors/oi_vid.cfm

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http://www.youtube.com/watch?v=GNIBqmPJ20M

The spread of Invasive Plants and the silt build up can be solved with suction harvesting and suction dredging on Lake fronts, ponds and waterways. History: DASH has been a technique used to remove and suppress invasive plants, since the Mid 70's however few companies have invested any resources to expand on the technology. Aquacleaner Environmental has been in this field since 2000 and has defined it's roll in the waterfront restoration industry by manufacturing a variety of suction harvesting machines including the most aggressive and mechanized system to date. In the service portion of our business we continue to lead the way by extracting more aquatic vegetation and working with a variety of invasive plants. In the 2008 season we removed over 20,000 onion bags of plants totaling over 500 tons of bio mass. The amount of bottom time our divers have has lead us to develop some very unique techniques which help yield quality suppressions of invasive plants. The operation of the nozzle is a key component to successful use of DASH. Working in turbid water and removing the plant that you can see along with it's associated roots crown is only part of the technique but removing years past plants in various stages of decomposition will help yield the best results. Other forms of suppression including solar powered water circulators, benthic matting, mechanical harvesting, and spot-herbicide treatment typically are only band aids since they don't address the root of the problem. Hand harvesting while being a valid form of plant removal does not offer the rate of progress (ROP) compared to that of DASH because a diver can only remove a small group of plants per hour, in a small confined area. When a patch is dense and has been present for a number of seasons, or when the plants or tall (over 4'), hand harvesting becomes a slow tedious process. Capturing the fragments of these plants can further slow down this process.

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Suction Harvesting of Eurasian Watermilfoil and its effect on Native Plant Communities
Use search engine to view or download pdf
Diver-operated suction harvester

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War of the Weeds from Outdoor Idaho Public TV
http://idahoptv.org/outdoors/shows/waroftheweeds/do.cfm
http://idahoptv.org/outdoors/shows/waroftheweeds/resources.cfm
http://idahoptv.org/outdoors/oi_vid.cfm

Payette Lake Weed Infestation - Idaho

Payette Lake, Valley County, Idaho
High quality lakes and fisheries are one of Valley County’s greatest resources. When Eurasian Watermilfoil was detected in Payette Lake in 1999, Valley County Weed Control acted swiftly, as an untreated Eurasian watermilfoil infestation could severely affect the ecology and public use of county waters. In 2000, Payette Lake was surveyed and a multiyear Integrated Aquatic Vegetation Management Plan was implemented to remove Eurasian watermilfoil from the lake. Diver dredging, hand removal, and bottom barrier placement have consistently lessened the density of Eurasian watermilfoil infestations, with approximately 120,000 pounds of Eurasian watermilfoil removed in six years.
In 2007, Valley County was awarded ISDA funds to continue the diver dredging operations and to expand the temporary bottom barrier placement program. Summer surveys indicated that control efforts had reduced the Eurasian watermilfoil infestation to approximately 6 acres, with an additional 5 acres of very sparse plants.

http://news.google.com/newspapers?nid=2156&dat=20061018&id=gtskAAAAIBAJ&sjid=dRIGAAAAIBAJ&pg=1726,1130340

Order the Video
You may order a video for this program by calling the Boise office during business hours (8:00 a.m - 5:00 p.m. Mountain):
* 1-800-543-6868 (outside the Treasure Valley)
* 373-7325 (within the Treasure Valley)

http://idahoweedawareness.net/vfg/fieldguide.html

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In 2006 the Preservation Association of Devils Lake asked DLWID to contact Lake Oswego about cyanobacteria suppression methods. Lake Oswego has a special boat to suck up floating debris. Further study may find that suction could be used to suck up cyanobacteria on the lake surface.

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