Flexible membrane dam

#1. Field of Invention

#This invention relates in general to dam arrangements for controlling water flow. More particularly, the invention relates to dam arrangements of the type that include an inflatable and collapsible member, such as, for example, a flexible membrane. Even more specifically, the invention is directed to the control chamber arrangement for controlling the inflating and collapsing of the flexible membrane.

#2. Description of The Prior or Related Art

#FIG. 1(A) (prior art) is a front view of a first embodiment of a conventional dam having an automatic collapsible means for use with a float as viewed from the direction of a stream being dammed;

#FIG. 1(B) (prior art) is a sectional view of the dam shown in FIG. 1;

#FIG. 2(A) (prior art) is a front view of a second embodiment of a conventional dam having an automatic collapsible means using a reservoir bucket, as viewed from the direction of a river being dammed;

#The presently preferred embodiment of the invention will now be further described with reference to FIGS. 3(A), 3(B) and 4. Reference numerals used in FIGS. 3(A), 3(B) and 4 that correspond to those used in prior art FIGS. 1(A), 1(B), 2(A) and 2(B) represent like or corresponding parts.

#An upper control chamber 20 is positioned on an embankment 22 above an estimated high water level 21. A lower control chamber 23 is constructed separately and distinctly from upper control chamber. Lower control chamber 23 is positioned adjacent to weir 24 at an underground position 25. Underground position 25 can be on either the left or right bank of the river adjacent to weir 24.

#Upper control chamber 20 includes a blower 1 which provides pressure for supporting the dam. Chamber 20 further includes a feed valve 2 and a pressure gauge 3 for sensing weir pressure. The overall function of upper chamber 20 is to control the supporting of the dam, i.e. maintaining it in its inflated state.