Abstract: A specific feature of the present invention comprising a water-permeable screen mounted on a perforated suction pipe is that located therein between the screen and the pipe are partitions the length of contour of which resting on the screen decreases towards the perforated pipe inlet, the screen surface defined by two adjacent partitions being superior to that of the pipe between the same partitions, whereas the partitions on said pipe are disposed in a manner such that the hydraulic resistances therebetween will increase in proportion to the distance from the partitions to the perforated pipe inlet.

Abstract: The present system includes arrangements for the low-cost storage of rain water runoff, and arrangements for distributing this runoff water during arid seasons. The system may be located at the sea coast where a water runoff channel enters the ocean, and where there is available protected ocean water which is of reasonably substantial depth. Heavy duty plastic containers are provided for receiving the fresh water runoff from a point just before the water would normally enter the ocean. Pumping station arrangements are also provided for distributing the water inland where it is required during arid seasons. The flexible plastic water containers may be many tens of feet in their dimensions, both horizontally and vertically. The upper edges of the containers may be secured to large floats, and suitable lightweight rigid covers may be provided to extend across the tops of the water containers.

Abstract: A self-regulating tide gate is installed on a conduit connecting an open body of water with a protected body of water. The tide gate comprises a mounting plate secured to the conduit at its end in the open body of water, the mounting plate defining an opening into the conduit. A door has its upper edge pivotally mounted at the top of the conduit, a door float is mounted to the door on its edge opposite the hinged edge and counterfloats are mounted to counterfloat arms extending from the door across the pivot axis thereof. When the water is below a critical level at which it is desired that the door close, the door float maintains the lower edge of the door on the surface of the water, thereby maintaining the door open and blocking debris from jamming the mouth of the conduit. As the water level rises, it acts on the counterfloat to pivot the door towards its closed position, whereafter the door is caught in the flow of water entering the conduit and rapidly pivoted to its closed position.