Instructables
Picture of How to Build a Cofferdam Brace
When using cofferdams for flood control on slopes, a bracing system is necessary. This DIY Instructable will guide you through five simple steps to help you build your own cofferdam brace.

To build a cofferdam brace, you will need the following:
    - Safety glasses - SAFETY FIRST!
    - Three 10' 2x4s (new or used)
    - 16 3" #8 self-drilling screws or nails
    - Hand saw with miter box
    - Screwdriver or Drill with driver head
    - Hammer (if using nails)
    - Tape Measure
    - Protractor
    - Pencil
 
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Step 1: Cut the wood

Picture of Cut the wood
Cut the pieces of the brace to the dimensions and angles shown on the drawing.

Step 2: Assemble

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Screw or nail the pieces of the brace together.  Be sure to use the dimensions from the drawing to assemble the brace correctly.

Step 3: Repeat

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Now repeat steps 2 and 3 to make a second brace.

Step 4: Connect braces with a beam

Picture of Connect braces with a beam
Connect an 8' beam over the top of both braces as shown in the picture.  This can be done with screws or nails.

Step 5: Setup

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Set the bracing system 6' from each side of the cofferdam.

Step 6: How to Build a Cofferdam Brace

The step-by-step instructions with drawings and pictures are on the attached file.