I'm new at competing and just went to my second meet where the entire pool was only 4ft deep. I didn't know how to dive properly. I came within inches of the bottom each time, and then when I tried to sdk for power and momentum I kicked the bottom with my feet and lost efficiency trying to get up and out on top. Plus, when trying to do the kick out, on breaststroke, at turns, I didn't have the room to use my strength and power to do it properly, I felt constrained.
What do the rest of you do?