Bernoulli Principle and Siphon Height

Water flows from a large reservoir through a pipe that reaches a maximum height of 3.0 m above the reservoir’s surface. At a certain height h, the pipe’s diameter narrows from 6.0 cm to 3.0 cm, which allows the water to just reach the maximum height. Assuming negligible fluid friction, at what height h above the reservoir’s surface must the constriction be placed?