On water What marks a mid channel?

Why don't kayaks sink? Sea level in ladner bc? What is a surge of water called? When is the Richmond Plunge open for public swimming? What is the purpose of the water stream under the platform during high dives? Where should hot water enter a pool to better heat the water? How deep can a scuba diver go on compressed air? Who invented swimming costumes? How much sand goes into a hayward gm 245 high rate sand filter? What materials are typically used when building pool fences? What is the Hawaiian word for river? Where can one purchase an Intex airbed? Is Neptune better than Poseidon? Can you still learn how to swim at an old age? Pro's and con's of a bottom drain in a swimming pool? Can sharks detect a drop of blood in a olympic sized swimming pool? How can one raise a hot tub up with a slab or cinder blocks Flood waters reach 4 feet. Whats the best way to raise a tub up avoiding the flood waters but still supporting the tub? What does not get any wetter no matter how much rain falls on it? Once a gunite pool is converted to a vinyl liner pool can you convert it back to being a gunite pool I live in the Panhandle of Florida and have no problem with ground water? How often should you drain an inground swimming pool if it is kept running year round?