Basis of cost calculation for dredging

Constant weekly costs such as depreciation and interest, maintenance, insurance premiums, which can be based on calculation guidelines such as the CIRIA publication A guide to cost standards for dredging equipment 2009 by R.N. Bray. 

Fuel and lubricants consumption (constant per operational hour) 

Wear and tear (constant per m dredged) both on board (on board pipes and pumps, teeth consumption, cutter head, draghead, etc.) and in the discharge pipelines. The wear and tear increases with the coarseness and angularity of the dredged material and is also influenced by the mineralogy. 

The operational costs of a dredging and reclamation project are often expressed in a relevant currency unit per m This is called the unit rate. This unit rate can be expressed as a function of the dredging vessel s weekly production. 

As is clear from the formula above, the weekly production of the dredger will have a very direct impact on the unit rate. And a dredging vessel s weekly production can be influenced by a great number of parameters such as soil type, layer thickness, pumping distance, wave chmate. 

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