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Several issues should be evaluated for each dredging project:
- The type of sediment to be removed.
- The type of dredging equipment to be used.
- The disposal options for the sediment (transfer, geo-bag, drying tube, pressing).
- The handling of the dredged effluent water (turbidity control, discharge compliance, transfer).
- The cost of the available options.
- Setting your parameters of success.
- Choosing your contractor, or performing the work yourself.
The characteristics of the sediment to be removed will affect several issues of the project. Compaction of the sediment will determine the best type of equipment to utilized. A professional evaluation of the sediment will determine the best equipment option for removal and drying of the sediment.
In most cases, hydraulic dredging will be the most cost effective method for your project. Hydraulic dredging can consist of several types of dredging equipment, choosing the proper type can have a great impact on your project. Evaluate all the aspects of the various equipment types being as objective has possible.
The sediment characteristics talked about earlier can greatly affect your project costs and sometimes lead to some very unpleasant surprises. Remember "Experience is a great teacher.......when it's someone else's experience!" There are so many variables to evaluate when dealing with the sediment and it's important you speak to professionals with a wide range of experience in ALL aspects of sediment treatment. This experience should include (under one hat) the mechanics of dredging, engineering parameters of fluid dynamics, thorough understanding of chemical aids available, and environment discharge parameters of the site. DWS can produce a complete report demonstrating the best options for your project.
The Dredged Effluent Water
Depending on the site conditions several options are available to control and maintain effluent water quality. The use of polymers can greatly improve your project performance, but choosing the wrong polymer types can greatly increase your operating costs unnecessarily. DWS brings to your team 30 years of water chemistry experience.
The Cost of the Available Options
The most critical part of the cost control is an accurate method of measuring the amount of sediment removed. DWS uses a unique method of measuring the sediment volume that does not require pre-dredge surveys, post surveys, etc. Additionally, as the volume of sediment being transferred reduces the unit costs to our clients also reduces. Let us show you how DWS can take the surprises out of your project costs.
Parameters of Success!
Our experience with many projects has proven the most important aspect is to clearly document the expectations of all parties is the best way to ensure the success of your project. At DWS all projects are designed and engineered with a WIN-WIN contract concept.
Choosing your Contractor
As you choose your contractor several factors as noted above are to be considered. One common mistake is that clients choose to rent the equipment and perform the work themselves. On a long-term project this makes sense to some degree, however on a short-term project the learning curve expense for dredging mechanics and teaching an operator the most effecient method of dredging is never recovered and often results in project failure. DWS can provide rental of dredging equipment ranging from small pit evacuation units up to several hundred horsepower units in both electric or diesel powered.