Ship's Squat Formula

Find the approximate calculated squat of your vessel is proceeding to a channel not enclosed with a width of 90 meters deep and dredge surrounding depths of 20 meters. Your vessel's draft is 11 meters and beam of 27 meters, speed 7 knots and block coefficient is 0.8.

Given:

               Speed = 7 knots
Block Coefficient = 0.8

What is asked?

Ship's squat

Solution:

This is the ship's squat formula on open waters and the unit of the answer will be meter.
      
                       Squat = Block Coefficient x Speed²
                                                   100
                                 = 0.8 x 7²
                                        100
                                 = 0.8 x 49
                                        100
                                 = 39.2
                                    100
                       Squat = 0.392 m      

Again, the example above is that we get  the value of the ship's squat in open waters. You might asked then, if there's a formula for squat on open waters, what will be the formula for squat on enclosed water?

To get the value of squat on enclosed water is to multiply block coefficient by the square of speed, and then times 2, then divide the product by 100.

Here is the problem for squat on closed water. Try to solve it yourself.

A container vessel of 12,000 tons displacement is approaching her berth at speed of 4 knots. Its block coefficient is 0.78. Calculate the value of squat.

Answer: 0.25 meters

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