Static structures (e.g. – buildings) – Cover with surface water receiver at eave or valley
Patent
1994-02-18
1996-06-11
Taylor, Dennis L.
Static structures (e.g., buildings)
Cover with surface water receiver at eave or valley
405 52, E04D 1300
Patent
active
055243932
DESCRIPTION:
BRIEF SUMMARY
FIELD AND BACKGROUND OF THE INVENTION
The object of the present invention is a method for delaying the run-off of flash-storm water or ordinary rainwater from roofs and other surfaces with a water-retention capability. The object of the invention is also a device for delaying the run-off of the flash-storm water or ordinary rainwater from roofs and other surfaces with a water-retention capability.
As a result of the intensive building activity in recent years, the sealing of the surfaces in development areas has increased. The flash-storm water falling on the sealed surfaces is thereby no longer slowly taken up naturally by nature but it runs off very rapidly together with a greater or a lesser amount of dirt. This has had the result that the government has taken steps in the case of larger buildings to retain flash-storm water on the spot upon, for instance, heavy rainfalls and/or to delay its further passage or seepage until later.
It has already been proposed, particularly in the case of flat roofs, first to collect the rainwater on the roof and then feed it in throttled fashion to the sewer. In order to compensate for large differences in temperature, a predetermined amount of water is frequently retained permanently on the roof.
In one known embodiment, the cross sections of the pipes leading from the roof to the sewer are correspondingly small so that only the prescribed permissible quantity can flow off.
In that case, to be sure, it is not sufficient merely to dimension the cross sections of the pipes suitably, but the laying of the pipes and their pitch as well as their hydraulic heights are all parameters which must be included in such a calculation. Accordingly, the design and the installation of such a run-off pipe system is very expensive and the positioning of the lines, especially if one proceeds in accordance with the principle of horizontally laid collector lines, frequently results in a high expense and in aesthetic problems within the building.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a method and a device which make it possible, with simple means, to adapt the amount of water flowing to the discharge lines to the capacity of the sewer system and/or of the sewage treatment plant, as well as to the water-retention capability of the structure. Another object is to develop the device in such a manner that the reliability of its operation is not dependent on any other parameters.
By throttling the amount of water which flows to the run-off pipe, it is possible, independently of the lay-out of the pipelines which lead from the roof to the sewer precisely to determine the maximum amount which runs off. Amounts of water which are below the maximum capacity can run off unimpeded at all times. If the amount of water received exceeds the capacity of the throttle member, retention takes place on the roof. If the maximum retention capability of the roof is exceeded, the additionally received water can be conducted away directly, bypassing the throttle, by an emergency run-off pipe which is arranged either in the throttle or separately. The quantity throttle at the inlet to the run-off pipe can be arranged directly in the plane of the roof or above it and need not be arranged in a recessed pot, which can lead to a weakening of the roof or to great difficulties in case of subsequent installation. The discharge lines within the building can be conducted to the most favorable points on the building site and their cross sections need be adapted only to the largest possible amount of water. The vortex-type throttle is not sensitive to clogging and, should foreign bodies nevertheless prevent a controlled discharge, it can be easily cleaned. The expense for the delayed run-off of flash-storm water is slight since no lengthy calculations of the pipe cross sections and expensive laying of the pipes within the building is necessary.
BRIEF DESCRIPTION OF THE DRAWINGS
With the above and other objects and advantages in view, the present invention will become more clearly un
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Mosbaek Johannessen
Nill Werner
Farber Martin A.
Nill Werner
Taylor Dennis L.
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