Abstract: The invention covers a procedure for measuring hydrostatic pressure, especially that of ground water, with the particularity that air is bubbled into the ground water, the pressure in the measuring pipe is fed to an absolute pressure cell and atmospheric pressure is then applied to the same measurement cell.

Abstract: The invention relates to a device for discharge limitation and simultaneous temporary storage of waste water and also separation of settleable and floating matter from foul water and is notable for the fact that it comprises a cyclone chamber (2) which is connected to an inlet (1), which is constructed in accordance with the natural spiral shape of the vortex and which comprises round openings (4; 6) at the top and bottom, and in that a rotationally symmetrical container (8) seamlessly adjoins the top opening (6), in which container (8) a guide pipe is disposed which extends centrally from the top opening (6) to just below the upper edge (10) of the container.

Abstract: A device for centrically charging tanks (9) with a spin chamber (1, 10) connected to an inlet (20) and to a vertical downpipe (2, 12) ending seamlessly in a trumpet-shaped mouth (3, 18). Rotary flow charges circular settlement tanks and sand sorters and sedimentation tanks in such a way that the Coanda effect is activated at the trumpet-shaped mouth (3, 18) and in turn causes the rotary outflow of fluid from the vertical pipe (2, 12) to be diverted into the horizontal plane or vertically upwards as well as a radially symmetrical flow in the tank (9). There is a guiding pipe (14, 16) in the downpipe (2, 12) with preferably circular apertures around its periphery and which is open to the atmosphere at the top.

Abstract: The invention relates to a method and an apparatus for the hydraulic branching of an open stream having at least one straight main stream of a specific momentum and having one or more branch streams. Deflection from the main stream is brought about using the Coanda Effect. The hydraulically working channel, i.e., the main stream channel has an upstream corner in common with the branch stream channel which corner is rounded in the form of an arc of a circle between the upstream channel and the branch channel and which converges toward the corner and extends opposite that wall of the upstream channel leading toward the corner and forms with the corner an outflow gap, such that the momentum of the main stream flow which emerges, creates the Coanda Effect, thereby deflecting the controlled flow of water into the branch channel.

Abstract: A method and apparatus for charging either a a shallow grit tank or a settling tank with waste water by means of a horizontal feed line and a horizontal drain line using the Coanda Effect. The waste water is pressured through a gap which directs the waste water stream onto a curved surface. Due to the Coanda Effect, the direction of the waste water is changed from downward when used in a shallow grit tank or changed from upward when used in a settling tank, to a substantially horizontal direction. The mineral constituents and the organic constituents of the waste water are consequently separated.

Abstract: The invention relates to an apparatus for central charging of circular tanks with sewage water by means of a vertical pipe and is distinguished by a centrally inserted horizontal circular control disc in the region of the transition from the vertical pipe to a smoothly continuously adjoining bell shaped component or body widening smoothly from a smaller diameter to a larger diameter and having a surface configuration substantially similar to the bell end of a trumpet or similar type of horn. The bell shaped component is attached or connected at the smaller diameter end to an end of the vertical pipe which end is configured to mate with the smaller diameter end of the bell shaped component. The outer periphery of the control disc and the inner surface of the vertical pipe, in the transition region defined to be the region where the bell shaped component connects with an end of the vertical pipe, forms an annular gap.