quote:
Dredging is measured by the cubic yard. Your assumption of "$50k/acre" means nothing if depth isn't considered. You add depth to area and you get....VOLUME. So, what depth is your $50k/acre based on? 5, 10, 20 feet? There is a big difference. So blatantly stating "per acre" is a poor measure for dredging and no contractor will quote you based on acreage if depth is not known. Secondly, hydraulic dredging is more expensive than mechanical dredging but goes quicker, depending on the situation of the contract. The costs per cubic yard for each varies differently. Therefore, stating "$50k/acre" ignores depth of dredge, means of dredging, not to mention the myriad of indirect costs or setup costs depending on your area of construction, means of access, etc... It's not as simple as stating a blanket $/acre = the cost.

Again, you do not know what you’re talking about. If you read my response to your idiotic question, contractors bid by the cubic yard. Planning models utilize price per acre. If you knew what you were talking about, you would also know that the entire area of the diversion outfall is roughly 2 to 3 feet deep. There are no areas that will be restored that are 10-20 feet deep. Also, the type of dredging can only be done using hydraulic dredges. Mechanical dredges need to be disposed of in either open water or barges. To get the sediment, out of the barges, you will need another pump, which makes mechanical dredging for restoration Much more expensive.

This post was edited on 5/10/24 at 2:13 pm

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Posted by BugAC

St. George

Member since Oct 2007

52945 posts

Posted on 5/10/24 at 2:17 pm to Marshhen

quote:
contractors bid by the cubic yard. Planning models utilize price per acre.

Again, acreage means nothing without volume. And depending on the area, and the soundings in that area, that volume will differ. That is the EXACT REASON why contractor bid it by volume. Which is why using $/acre in planning is not an accurate measure if you are not accounting for the volume. What volume is your $50k/acre based off of? Where are you pulling these numbers from? Is $50k based on 3 feet? If so, that is a VOLUMETRIC calculation. Which is my entire point. However, if you are taking statewide averages of actual projects, then a) it's likely bid by the cubic yard and b) if its bid by the acre, then the project SHOULD specifically state the assumed depth of dredge which would then give you your volumetric measure.

In addition, if you dredge out these areas only 2-3 feet, that will have to be redone much more regularly than every 20 years. 1 storm surge could wipe that out, depending on the severity of the storm.

This post was edited on 5/10/24 at 2:19 pm

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