Flexible, vertically-adjustable dam

Claim 1

AN INFLATABLE FLEXIBLE DAM FOR RETAINING WATER IN A STREAM BED HAVING A FLAT BED BASE AND TWO UPWARDLY SLOPING BANKS EACH EXTENDING LONGITUDINALLY OF A RESPECTIVE SIDE OF SAID FLAT BED BASE, SAID DAM COMPRISING AN ELONGATED, HOLLOW, FLEXIBLE CENTRAL CYLINDRICAL PORTION OF UNIFORM CROSS-SECTION THROUGHOUT ITS LENGTH AND HAVING A FLATTENED BOTTOM EXTENDING TRANSVERSELY OF THE BASE OF THE STREAM BED, AND TWO HOLLOW, CONICAL, FLEXIBLE END PORTIONS DEFINING CONTINUATIONS OF SAID CENTRAL PORTION AND EACH EXTENDING TRANSVERSELY OF A RESPECTIVE UPWARDLY SLOPING BANK; THE TRANSVERSE CROSS SECTION OF EACH SAID CONICAL END PORTIONS BEING SUBSTANTIALLY HOMOTHETIC WITH THAT OF SAID CENTRAL CYLINDRICAL PORTIONS AND PROVIDING FLATTENED BOTTOMS THEREOF, AND CONTINUALLY DIMINISHING TOWARD THE VERTEX OF THE RESPECTIVE CONICAL PORTION; CLAMPING MEANS FOR ANCHORING SAID DAM ON SAID BED, SAID CLAMPING MEANS EXTENDING STRAIGHT AT LEAST ALONG THE UPSTREAM LOWER EDGES OF THE FLATTENED BOTTOMS OF SAID CENTRAL PORTION AND CONTINUING UPWARDLY ALONG SAID SLOPING BANKS ON THE UPSTREAM LOWER EDGES OF THE FLATTENED BOTTOMS OF SAID CONICAL END PORTIONS, AND INCLINING DOWNSTREAM OF THE UP-