Hydraulic and earth engineering – Fluid control – treatment – or containment
Patent
1996-05-30
1998-09-01
Taylor, Dennis L.
Hydraulic and earth engineering
Fluid control, treatment, or containment
210166, 405 36, 52 11, E02B 1300
Patent
active
058000925
ABSTRACT:
To retain water on roofs of buildings with a water-retention basin, a vortex-type throttle valve is fitted on the roof and is connected to a drain pipe leading to a drain. The throttle valve makes it possible to control 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.
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Mosbaek Johannessen
Nill Werner
Farber Martin A.
Taylor Dennis L.
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