A generally horizontal platform has connected to a first end thereof a sloping ramp that extends into the water of a swimming pool. Illustratively, cuckoo hashing may be modified and applied to construct the file system metadata arrangement. Thus, the time complexity of the joint-optimization method is significantly less than that of existing methods. An intravenous catheter apparatus may include the needle guard in combination with a needle and a catheter tube attached to a catheter hub, the catheter hub having a chamber.