HSI Services, Inc. has 20+ years of experience in water management

Cofferdam Cost Calculator

AQUA-BARRIER PRODUCT COST

Product Cost
Height ft.
Length ft.
Week in use week(s)
Number of moves move(s)
Unit cost $
Freight $
Total Product Cost $
Labor Cost
Average wage $
Total man hours hour(s)
Total Labor Cost $
Equipment Cost
Equipment usage cost $
Fuel cost $
Miscellaneous cost $
Total Equipment Cost $
Total Aqua-Barrier Cost $

Select Comparison Cofferdam

Sheet Piling   Earthen Dam  




Length:

Aqua-Barriers are rented in 25ft increments up to 100ft in length.

Aqua-Barriers are connected using an overlap method. Common connections are:

                     
45 degree connection 90 degree connectionEnd to End connection

Overlap requirement per Aqua-Barrier height:


Inflated Aqua-Barrier height Overlap requirement
3ft 4.5ft
4ft 6ft
6ft 9ft
8ft 12ft

Length:

Require length of cofferdam

Length:

length of required cofferdam.

Please select type of earthen dam:

Trapezoid with 10 ft top and 2-1 side slopes:

This type of dam is needed when unable to build the cofferdam from the shoreline or barge. The 10ft wide top of the earthen dam is capable of accommodating earth moving equipment.

Triangle 2 to 1 side slopes:

The type of earthen dam is used when equipment from the shoreline or a barge can build the earthen dam.

Height:

Aqua-Barriers are capable of controlling up to 75% of their inflated height. The depth that the barrier will sink into the site sediment will also need to be determined.

Water depth + sediment penetration combined = depth control


Inflated Aqua-Barrier height Maximum water depth control (including sediment penetration)
3ft 2.25ft
4ft 3ft
6ft 4.5ft
8ft 6ft

Height:

General rule is 2/3 of the piling lengths needs to be in ground


Water depth control minimum Piling length
6ft 20ft
5ft 17ft
4ft 14ft
3ft 11ft

Height:

The earthen dam height should be atleast 25% higher than the surrounding water ( example: controlling 6ft of water depth would require a 8ft high earthen dam)

Weeks in Use:

Aqua-Barriers are rented at a minimum of one month. After the initial month rental a weekly lease rate applies

Number of moves:

The number of times that the Aqua-Barriers are moved and reinstalled is also a factor in the rental pricing. Two moves are allowed without any additional costs.

See additional costs for moves below:


# Of Reinstallations Multiply by monthly rental costs
3 X 1.5
4 X 2.5
5 X3.5
6 X4.5
7 X5.5
8 X6.5

Unit costs:

Calculated by selecting the barrier height, the barrier length, number of week in use, and number of moves

Freight:

All Aqua-Barriers are normally shipped by standard Freight carriers. Freight costs are based upon weight and distance traveled

See below for the Aqua-Barrier weights per 25ft section:


Aqua-Barrier height weight per 25ft section
3ft 140lb
4ft 175lbs
5ft 320lbs
6ft 440lbs

Freight:

Steel pilling is shipped on dedicated flat bed trailers. Freight costs are based upon weight and distance traveled

Total Product Cost:

Unit costs + freight costs = total product costs

Total Product Cost:

Calculated by number of tons X cost per ton + number of tons X cost cleanup per ton + freight = total product cost

Labor costs:

A crew of 4-6 men, which includes the equipment operator, is recommended when installing and removing Aqua-Barriers. The program automatically adds an additional 33% for true labor costs( workers comp, benefits, etc.)

Average wage:

Calculated by adding the wage paid to each employee involved with installing and removing the Aqua-Barriers and diving by the number of employees

Average wage:

Calculated by adding the wage paid to each employee involved with installing and removing the Aqua-Barriers ÷ number of employees

Total man hours:

See estimated Aqua-Barrier time for installation and removal below:


Total labor hours Change installation and removal time chart
3ft 25 minutes
4ft 35 minutes
5ft 45 minutes
6ft 1 hour
7ft 1 hour 10 minutes
8ft 1 hour 15 minutes

Total man hours:

An average installation and removal time for sheet piling is 30 foot per day

Total Labor Cost:

Average wage x total man hours = Total labor costs

Total Labor Cost:

Average wage x total man hours = Total labor costs

Equipment usage costs:

Cost for equipment used to install and remove the Aqua-Barriers. Generally (2) 4 in 8 horse power trash pumps or (1) 6 inch trash pumps are used to inflate the barriers. They are not required for the barrier removal process. Preferred hydraulic equipment for installing and removing the barriers is a medium to large track hoe with a 30 ft arm. Standing water applications require one piece of equipment and moving water which includes tidal influence require two pieces of equipment.


Standard rental costs Rental rate per day
4in trash pump (includes discharge and suction hose) $125
6in trash pump (includes suction and discharge hose) $270
Medium to large track hoe $500 + delivery and return costs on average $1,000)

Rental Equipment:

Equipment rental costs


Rental Equipment Rental rate per day
Pile hammer $200 average
Vibrating hammer $300 average
Medium to large track hoe $500 + delivery and return costs average $1,000

Fuels costs:


Equipment type Fuel use per hour
4in trash pump ½ gallon
6inch trash pump 2 gallon
Medium to large track hoe 8-15 gallons of fuel per hour
6ft 1 hour 30 minutes

Fuels costs:

Medium to large track hoe 8-15 gallons per hour

Miscellaneous cost:

Sandbags, steel pipes, landscape timbers, rope, etc.

Miscellaneous cost:

Site restoration or cleanup / turbidity measures / ETC.

Total equipment costs:

Equipment usage costs + fuel costs + miscellaneous cost = total equipment costs

Total equipment costs:

Equipment usage costs + fuel costs + miscellaneous cost = total equipment costs

Total Aqua-Barrier costs:

Aqua-Barrier rental costs + freight plus labor + equipment costs = total Aqua-Barrier costs

Weight per square foot :

20lbs-25lbs per square foot is sufficient due to the fact of only controlling 6ft of hydrostatic pressure.

Number of tons:

Calculated by: height x length x weight per SF ÷ by 2000 = number of tons.

Cost per ton:

Rental cost per ton ranges between $350-450 for the 1st month. Subsequent months rental costs range between $35 and$50.

Cleanup costs:

Clean up and repair costs average around $35 a ton.

Cubic yards of fill required:

Calculated by type of earthen dam Height x length = cubic yards of fill required.

Turbidity curtain/ sheet plastic costs:

Type 1 turbidity curtail with a 6ft drop is $6.00 lf. (1) 20ft x 100ft roll of 10 mil plastic is $200.00

Freight :

A standard size dump truck is capable of hauling 13 cubic yds. Freight costs are calculated by volume of earthen fill transported and distance.

Total Product cost:

Calculated by selecting the type of earthen dam height x length = cubic yds of earth x cost per cubic yd + turbidity curtain/ sheet plastic + freight = total product cost

Average wage:

Calculated by adding the wage paid to each employee involved with installing and removing the earthen dam and diving by the number of employees.

Total man hours:

Using a 4 man crew estimated man hours for each type of earthen cofferdam


Estimated installation and removal time for 25ft sections of earthen dam
Dam height Triangle style / 2 to 1 side slopes Trapezoid / 10 wide flat top / 2 to 1 side slopes
3ft (capable of controlling 2.25ft of water depth) 45 minutes 1 hour and 15 minutes
4ft(capable of controlling 3ft of water depth) 1 hour and 15 minutes 1 hour and 50 minutes
6ft(capable of controlling 4.5ft of water depth) 1 hour 30 minutes 2 hours and 30 minutes
8ft(capable of controlling 6ft of water depth) 2 hour 30 minutes 3 hours and 45 minutes

Total labor costs:

Average wage x total man hours = Total labor costs

Equipment usage costs:

Equipment rental costs per day.

Fuel costs:

Medium to large track hoe 8-15 gallons per hour.

Misc costs:

Site restoration or cleanup / turbidity measures / ETC.

Total equipment costs:

Equipment usage costs + fuel costs plus miscellaneous cost = total equipment costs

Equipment usage costs:

Equipment rental costs per day:


Rental Equipment Per day renal rate
Medium to large track hoe $500 + delivery and return costs average $1,000
Medium to large bull dozer $500 + delivery and return costs average $1,000

Labor costs:

A crew of 4-6 men, which includes the equipment operator, is recommended when installing and removing Aqua-Barriers. The program automatically adds an additional 33% for true labor costs( workers comp, benefits, etc.)

Labor costs:

Installing and removing sheet piling requires at a minimum a crew of 4 man which includes the equipment operator. The program automatically adds an additional 33% for true labor costs( workers comp, benefits, etc.)

Labor costs:

Earthen dam installation and removal requires at a minimum a 4 man crew which includes the equipment operator. The program automatically adds an additional 33% for true labor costs( workers comp, benefits, etc.)

Fill cost per cubic :

The cost of fill varies greatly from project to project. $15 a cubic yard is considered normal.

HSI Services Inc. is dedicated to supporting our clients in achieving their objectives. We endeavor to provide the highest quality products and client services. We are committed to ongoing research and development to improve our existing products and develop other products to serve our clients needs. Our objective is to be experts in the industries that we service.

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