Automatic irrigation gate

Claim 1

A GATE FOR CONTROLLING THE FLOW OF LIQUID IN AN OPEN DITCH COMPRISING: (A) A GATE MEMBER ROTABLE ABOUT A HORIZONTAL AXIS LOCATED ABOVE THE CENTER OF GRAVITY OF SAID MEMBER, SAID GATE MEMBER BEING IN A SUBSTANTIALLY VERTICAL POSITION WHEN CLOSED AND HAVING AN OPENING EXTENDING BELOW THE LEVEL OF A LIQUID BACKED UP BEHIND SAID GATE WHEN CLOSED; (B) LATCH MEANS ON THE GATE TO MAINTAIN SAID GATE IN A CLOSED POSITION; (C) A VERTICALLY ADJUSTABLE COVER OVER THE OPENING IN THE GATE MEMBER TO PERMIT OVERFLOW OF LIQUID ABOVE A PREDETERMINED DEPTH; (D) AN OPEN-TOP RECEPTACLE MOUNTED ON THE DOWNSTREAM SIDE OF THE GATE MEMBER FOR COLLECTING LIQUID OVERFLOWING THROUGH THE OPENING IN THE GATE MEMBER; (E) A FIRST ELONGATED ARM ROTATABLY MOUNTED ON THE DOWNSTREAM SIDE OF THE GATE MEMBER AND HAVING ONE AND EXTENDING OVER THE OPEN TOP OF THE RECEPTACLE; (F) A FIRST FLOAT CONNECTED TO SAID END OF THE FIRST ELONGATED ARM AND EXTENDING DOWNWARD INTO SAID RECEPTACLE; (G) MEANS CONNECTING THE ELONGATED ARM TO THE LATCH MEANS TO RELEASE SAID LATCH MEANS WHEN A PREDETERMINED AMOUNT OF LIQUID HAS OVERFLOWED INTO THE RECEPTACLE AND HAS CAUSED THE FIRST FLOAT TO RISE; (H) A SECOND FLOAT SECURED TO THE UPSTREAM SIDE OF THE GATE MEMBER NEAR THE LOWER END THEREOF TO CAUSE SAID GATE MEMBER TO ROTATE UPWARD WHEN THE LATCH IS RELEASED; (I) AN ELONGATED SUPPORT MEMBER RIGIDLY SECURED BY ONE END TO THE GATE MEMBER AND EXTENDING ABOVE THE CENTER OF GRAVITY THEREOF WHEN SAID GATE MEMBER IS IN A CLOSED POSITION;