Abstract: A hydrodynamic skylight apparatus employed for use on building roof structures, so as to transmit in a controlled manner solar light and heat into the interior areas. The apparatus comprises a peripheral frame structure to support one or more transparent or translucent panels. A central support strut is employed when more than one panel is mounted. A sealing member is interposed between the panels and the flange members, whereby there is defined a reservoir having a fluid inlet and outlet. The side walls further include support brackets defining drain channels, the channels being arranged to be mounted to the part of the roof structure where the skylight is to be mounted. Additional embodiments include a pump-and-filter system and spray bars whereby water can be selectively allowed to flow into the reservoir, either intermittently or continuously as may be desired.