u/Fluid_Skill_472

I have a couple acres of pasture that I flood irrigate. At the head of my pasture I have a large ditch and I flood through 2- 12" headgates. The gates themselves have seemed to leak a fair amount, when they are closed, around the opening. I have a couple thousand square feet of pasture that is always wet. The seal is just metal on metal. Is there a way to tighten them or seal them so I dont have water flowing when I dont want it to?