PROCEDURES AND PREPARATION FOR INCREASED EXPLOITATION OF METEOR OR REGENERAL WATER FROM DIRECTORS AND PLANTS OF REFRIGERATED STEEL CAPACITY

摘要

PCT No. PCT/CH93/00165 Sec. 371 Date Feb. 18, 1994 Sec. 102(e) Date Feb. 18, 1994 PCT Filed Jun. 29, 1993 PCT Pub. No. WO94/00653 PCT Pub. Date Jan. 6, 1994.In order to retain water on the roofs of buildings with a water-retention basin, a vortex-type throttle valve is to be fitted on the flat roof and is to be connected to a drain pipe leading to a drain. The throttle valve makes it possible to control the rainwater run-off at a given rate determined by the size of the throttle valve. If rain falls at a high rate, the excess is retained. Overflow protection is provided by fitting on top of the throttle, a length of pipe which permits the unrestricted flow of water through the throttle valve. Alternatively, the drain pipe can be extended upwards to the maximum permitted water-retention level, thus allowing the water which exceeds this level to pass directly into the drain pipe.