Planar subD face

Newbie question on SubD: Starting with a 3 face x 1 face planal subD, I raise the left and right edges above the Z plane. The result is that the middle face is now curved. How do I make the middle face planar and the left and right faces tangent to it? Where this comes into play is that I want my boat hull to have parallel midbody.

the only way keeping the middle part on the ground at least that i can think of, is by inserting edges, or starting with more faces in one direction. 3 faces will not get you far in that case.

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