Dredging World News Blog

Dredging and Shoreline Remediation

Posted by Elizabeth Kaiser on Wed, Dec 07, 2011 @ 08:12 AM

By Elizabeth Kaiser, SRS Crisafulli Marketing Manager

Many situations can complicate a shoreline’s integrity.  These can range from flooding, hurricanes and man-made disasters and can even include aquatic harvesting and human recreation.  Making efforts to protect a shoreline from these intrusions helps protect economic and recreational interests.  Shoreline remediation is an investment in the overall economic and natural habitat of a community.

As defined by the Erosion Control Technology Council (ECTC), Sediment Control is A practice that captures soil particles on site that have been detached and moved by wind or water.   While different methods and practices are used when it comes to shoreline remediation and sediment control we will examine a specific method, dredging and shoreline remediation.

Let’s look at the Southwest Mordecai Ecosystem Restoration Project or “SWMER”.  According to the SWMER Project Scope found at mordecaimatters.org, “The SWMER Project focuses primarily on several rapidly eroding areas on the southern rim of Mordecai Island.Southwest Mordecai Ecosystem Restoration Project

SWMER complements Mordecai Land Trust’s wave barrier project with the Army Corps of Engineers which involves the planned installation of a barrier off the western coast of Mordecai north of the SWMER area.

The SWMER project required careful planning on the part of Mr. Jim Dugan, President of Pond Recovery Services of Hainesport New Jersey and contractor for the SWMER project.

Jim Dugan has owned and operated dredges for many years and has used them in conjunction with Geotubes for the purposes of shoreline remediation.  He has contracted his restoration services throughout New Jersey and surrounding waterways including the Chesapeake Bay.  President of the Mordecai Land Trust, Jeffrey Hager, wrote of Jim Dugan, regarding the SWMER project, “He (Jim Dugan) proved to be an extremely competent and conscientious field manager,…”

Jim Dugan describes the SWMER project as a material handling challenge.  “We had to move 900 tons of sand to an island in the bay.”  As described in the Mordecai Matters Newsletter, Winter 2010 issue, SWMER involves the installation of close to 600’ of huge sand-filled fabric tubes called Geotubes, slightly off the south-western edge of Mordecai Island.  “The erosion has been severe here and the hope is to stabilize this fragile part of the Island and encourage the deposition of grasses and other organic materials between the island’s edge and the two long sections of Geotube.

Jim explained that they couldn’t use the sand from the bay so they transported 900 tons of clean sand from a nearby quarry by truck.  But how do you get the sand to the island?  “You have to pump it.”  Jim said there were 2 major challenges involved.

  1. Don’t plug the pipeline with too much sand
  2. Water/tide problem

Jim needed to use the water in the bay to mix with the clean sand in order to pump the sand underneath a navigation channel, across the island, and through floating line to the Geotube feed ports.  Jim needed a flexible solution. Since he was pumping downhill under a 15 foot channel, he couldn't risk shutting down with sand in the line. He used one of his Crisafulli dredges to act as a mobile sand pump to adapt to the wind and tide level fluctuations in the bay. The dredge would be flexible enough that his operator could adjust the articulating cutterhead height, angle and distance to the feed, thus keeping the sand-water mix at an constant rate. This also allowed frequent start-stop operation to flush the line and switch Geotube feed ports, thus filling the Geotubes evenly.

sand spreader

Jim used a hopper with a belt to deliver the sand to a sand spreader.  The sand spreader distributed the sand evenly to match the 8 foot wide dredge cutterhead.  The cutterhead mixed the sand and water allowing for an optimal pump mixture.

dredge sand pump

Using the dredge as a sand pump Jim was able to pump the sandy mixture up to ½ a mile directly into each of the geotube ports spaced 20’ apart.   “(This project) needed a lot of flexibility which the dredge allowed for” Stated Jim.

Read Jim Dugan’s SWMER blog of his progress in the Mordecai Matters Winter 2010 newsletter

Watch video of the shoreline with the installed geotubes at Mordecai Island Geotubes in Action on YouTube.

If you would like to email Jim Dugan, send your email inquiry to jimdugan@comcast.net.

Watch SRS Crisafulli videos.

Topics: Dredges, crisafulli, dredge, dredging, marina dredging, srs crisafulli, dredging abrasive materials, lagoon dredges, dredging system, dredging and pumps

For $50,000, who wants to be a SRS Crisafulli Millionaire?

Posted by Elizabeth Kaiser on Thu, Jul 14, 2011 @ 13:07 PM

SRS Crisafulli's factory location is intriguing.  SRS Crisafulli is a dredge and pump manufacturer with a factory in land-locked Eastern Montana.  "Glendive, Montana is a unique and very rural community" says SRS Crisafulli President/CFO, Laura M. Fleming. "Glendive is about as far off the beaten track as can be found in modern America. We had two visitors from Israel this week, and sent them home with special stories about Eastern Montana."SRS Crisafulli Factory Employees

"Good People Surrounded by Badlands" is a phrase promoted by the Glendive Chamber of Commerce.  "It was even a $50,000 question on Who Wants to be a Millionaire" adds Ms. Fleming.

"When I present at public speaking events, I use the phrase:  'The River is our Teacher.'  The Yellowstone River and the unique terrain in Eastern Montana created the Company - and vice versa - the people who homesteaded in this area developed unique irrigation methods and technology.  The landscape contributes to the DNA of SRS Crisafulli" says Ms. Fleming.

Photojounalist Lynn Donaldson has visited the Glendive and the SRS Crisafulli factory on several occasions.  "You may visit Lynn's Montana blog at www.placesbetweenspaces.com where you will get a taste of real Montana", says SRS Crisafulli Sales Manager Maureen Lundman.

Yellowstone River at Glendive

The 28 year SRS Crisafulli veteran employee, Ms. Lundman, says "Glendive, our 'City by the Yellowstone', offers unrivalled scenery.  The mighty Yellowstone River bisects the town.  We're always watching the river."

Makoshika State Park

"Glendive is bordered by the rugged and majestic Makoshika State Park. Makoshika (Ma-ko'-shi-ka) is a variant of a Lakota phrase meaning land of bad spirits or badlands."

"Glendive is a warm & welcoming community, and a great place to live--with an excellent school system, a 2-year college, state-of-the-art medical facilities, fantastic hunting, fishing and recreation, as well as a good share of the fine arts available locally."

"SRS Crisafulli employees count themselves as fortunate to live under Montana's Big Sky!" comments Ms. Lundman.  

For additional background about Glendive, please visit:  www.glendivechamber.com

For additional information about Makoshika State Park, please visit:  www.makoshika.org

For a taste of real Montana, please visit Photojournalist Lynn Donaldson's blog:  www.placesbetweenspaces.com

Topics: Dredges, crisafulli, dredge, dredging, marina dredging, srs crisafulli, lagoon dredges, International Exports, Hydraulic dredging

How Marinas Benefit From Scheduled Dredging

Posted by Elizabeth Kaiser on Fri, Apr 15, 2011 @ 08:04 AM

dredging marinas - SRS Crisafullidredging marina - srs crisafulli

Scheduled dredging enables marina owners to increase their profits and minimize their environmental impact.

 

The purpose of this article is to highlight the importance and value of scheduled dredging for marinas.

Maintaining adequate water depths in each boat slip and on approaches to marinas at low tide is essential to attract and keep the largest yachts in the regional market – yachts that generate the largest marina fees.

Without regularly scheduled dredging, marinas can be temporarily forced to close their slips for their best paying customers. Dredging just part of a marina can have costly and adverse environmental consequences in tidal areas by accelerating silt build up in slips for larger boats, and compromising water flows and drainage throughout the marina.

Environmental issues are more complex and include:

• Protection of water quality and marine life.
• Protection of docks, slips, and boats.
• Removal and disposal of clean sediment.
• Removal and disposal of contaminated sediment.
• Traffic, noise, and odors disturbing neighbors.

Since sediment build up is ongoing and predictable, a dredging schedule should be seriously considered. Key benefits of a dredging schedule include: 

• A budgeted expense rather than an unpredictable cost.
• Uninterrupted use of the marina.
• A reduction in problems caused by the permitting process often related to sediment disposal.

Most experts recommend dredging at two or three year intervals.

marina dredging srs crisafulli case study 

 

 

 

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Next time your marina is due to be dredged will you contract the task to others or do the work yourself? Please share your thoughts in the comments section below

Topics: Dredges, dredging, marina dredging