Which hull type is not effective in deep waters due to its shallow draft?

The flat-bottom hull is specifically designed with a shallow draft, which makes it ideal for use in calm, shallow waters such as rivers, lakes, and bays. This design allows the boat to efficiently navigate in areas where the water is not very deep. However, in deep water conditions, this type of hull can struggle due to its inability to handle waves and rougher conditions effectively. The flat bottom lacks stability and can be easily impacted by the motion of the water, leading to a rougher ride.

In contrast, other hull types such as multi-hull, round bottom, and deep Vee hulls are designed for better performance in deeper waters. They are more adept at cutting through waves and can handle the challenges posed by larger bodies of water, providing stability and comfort during operation. Therefore, the flat-bottom hull is indeed not effective in deep waters due to its shallow draft.