Abstract: Apparatus for generating waves in a swimming pool comprises a reservoir, independent of and separate from the pool, the reservoir containing a volume of water to be supplied to one or more inlets communicating into the lower regions of the swimming pool, and one or more flow paths through which the water from the reservoir is fed to the or each inlet, the or each flow path including a flow control valve therein and a volume of air downstream of the associated control valve for entrainment with the water flowing to the swimming pool such that, on entry of the water into the swimming pool, a wave having a turbulent, air-containing wake is formed.